Flooding as a treatment for phobias | AQA A-Level Psychology Revision
- Revision Notes
- Aug 3
- 27 min read
Updated: 7 days ago
For 7182 specification, first teach in September 2025
AQA A-Level Psychology | Free Revision Notes
Estimated study time: 45 minutes
These Flooding A-Level Psychology revision notes explain how phobias may be treated through immediate and prolonged exposure to a highly feared stimulus. The client cannot rely on their usual avoidance response, so anxiety eventually decreases and the expected danger does not occur. You will compare flooding with systematic desensitisation and evaluate its effectiveness, speed, cost, ethical acceptability and suitability for different clients and phobias. Flooding is a required behavioural treatment within the AQA specification.
Learning Objectives 🎯
By the end of this revision page, you should be able to:
Explain how flooding is used to treat phobias.
Explain how prolonged exposure may weaken a conditioned fear response.
Apply flooding to unfamiliar phobia scenarios.
Compare flooding with systematic desensitisation.
Evaluate the effectiveness of flooding.
Evaluate whether flooding is appropriate for particular clients and phobias.
Revision Notes 📚
Flooding A-Level Psychology revision overview
Flooding is a behavioural treatment for phobias in which the client is exposed immediately to a highly feared object or situation.
Unlike gradual exposure therapy, flooding does not begin with a mildly frightening stimulus.
Instead, the client confronts the strongest or one of the strongest levels of fear from the beginning.
Examples might include:
A person with a dog phobia remaining near a calm dog.
A person with a lift phobia completing a lift journey.
A person with a fear of spiders remaining in a room with a spider.
A person with a fear of enclosed spaces remaining in an enclosed setting.
A person with a fear of flying completing a flight or realistic simulated flight.
The client remains exposed for a prolonged period and is prevented from escaping or avoiding the situation.
The central idea is:
Anxiety cannot remain at its highest level indefinitely.
When the feared outcome does not occur and anxiety eventually decreases, the phobic response may weaken.
The central components of flooding
Flooding involves:
Careful assessment and preparation.
Informed consent.
Immediate exposure to a highly feared stimulus.
Prevention of avoidance or escape.
Prolonged exposure.
Reduction of anxiety.
Learning that the feared outcome does not occur.
A simple flooding sequence
Phobic stimulus → intense anxiety → continued exposure → anxiety decreases → fear association weakens
Flooding directly targets the avoidance behaviours described in the behavioural, emotional and cognitive profile of phobias.
The behavioural basis of flooding
Flooding is based on behavioural principles.
According to the acquisition and maintenance account of phobias:
Classical conditioning may explain how fear is acquired.
Operant conditioning may explain how avoidance maintains it.
Flooding attempts to disrupt both parts of this learned pattern.
Classical conditioning and learned fear
A previously neutral stimulus may become associated with a frightening experience.
For example:
A dog is initially neutral.
A dog bite naturally produces pain and fear.
The dog becomes associated with the frightening experience.
Dogs later produce a conditioned fear response.
The dog has become a conditioned stimulus.
Fear of the dog is a conditioned response.
The principles involved are covered through learning by association.
Operant conditioning and avoidance
Once the phobia has developed, the person may avoid the feared stimulus.
For example:
The person sees a dog.
Anxiety rises.
They cross the road.
The dog is no longer nearby.
Anxiety falls.
The relief reinforces crossing the road.
This is negative reinforcement because an unpleasant experience, anxiety, is removed.
The behaviour becomes more likely to occur again.
The principles behind reinforcement are developed through learning from
Flooding interrupts avoidance
During flooding, the client cannot use their usual escape or avoidance response.
Instead, they remain exposed.
This gives them the opportunity to learn that:
The feared outcome does not occur.
Anxiety can decrease without escape.
They can remain in the situation.
Avoidance is not necessary for safety.
The phobic stimulus is less dangerous than expected.
Preparing for flooding
Flooding should not involve unexpectedly exposing an unprepared person to their greatest fear.
The therapy requires professional planning.
Initial assessment
The therapist should establish:
The exact object or situation feared.
The severity of the phobia.
How the fear affects everyday life.
The client’s avoidance behaviours.
The feared outcome predicted by the client.
Whether exposure can be arranged safely.
Whether flooding is suitable for the person.
Whether the client understands the procedure.
Identifying the feared outcome
The same broad phobia may involve different fears.
For example, two people with a fear of lifts may predict different outcomes.
One may fear:
The lift falling.
Another may fear:
Becoming trapped and panicking.
Another may fear:
Being unable to escape in front of other people.
Understanding the client’s particular prediction helps the therapist design relevant exposure.
Informed consent
Informed consent means that the client understands what treatment involves and agrees to participate.
The therapist should explain:
That exposure will be intense.
That anxiety is expected to increase initially.
That the person will be encouraged to remain in the situation.
That leaving too quickly may prevent the treatment from working.
The possible risks and benefits.
Alternative treatments that may be available.
Consent is particularly important because flooding is deliberately distressing.
Physical and psychological suitability
The therapist should consider whether intense anxiety creates additional risks.
Relevant factors may include:
The client’s general health.
Their ability to understand the procedure.
Their motivation.
Previous experiences of exposure.
The nature of the phobia.
Whether a real-life exposure can be conducted safely.
The feared stimulus must be psychologically threatening to the client but not genuinely dangerous.
For example, flooding for a dog phobia should use a suitable, controlled animal rather than an aggressive dog.
How flooding is carried out
Immediate high-level exposure
The client is exposed rapidly to a highly feared situation.
There is no gradual movement through a hierarchy.
For example, a client with a dog phobia might be asked to remain in the same controlled space as a calm dog.
A client with a lift phobia might complete a lift journey rather than beginning with a photograph.
Prolonged exposure
Exposure must continue for long enough for the anxiety response to decrease.
A brief encounter followed by escape could strengthen the phobia.
For example:
The client enters a lift.
Anxiety rises sharply.
The client immediately leaves.
Anxiety decreases.
Escape is negatively reinforced.
This would repeat the maintenance process described by the two-process model.
Flooding instead requires the client to remain until anxiety becomes manageable.
Prevention of escape
The therapist encourages the client not to leave the situation as soon as fear rises.
This is sometimes described as response prevention because the usual avoidance response is prevented.
The therapist does not physically trap or coerce the person.
The client has agreed to treatment and understands why remaining is important.
Repeated or extended sessions
Some clients may show substantial improvement during one prolonged session.
Others may require:
More than one exposure session.
Exposure to several variations of the stimulus.
Practice in different locations.
Follow-up sessions.
Independent exposure after therapy.
The aim is for learning to transfer beyond one carefully controlled encounter.
In vivo flooding
What is in vivo flooding?
In vivo flooding involves direct exposure to the real feared object or situation.
Examples include:
Remaining near a real spider.
Travelling in a lift.
Standing on a secure high structure.
Remaining near a calm dog.
Entering an enclosed but safe space.
Advantages of real-life exposure
In vivo flooding may provide powerful learning because:
The client encounters the actual stimulus.
The experience closely resembles everyday life.
The feared outcome can be tested directly.
Improvement may transfer more easily to ordinary settings.
Practical difficulties
Real exposure may be difficult when:
The feared object is unavailable.
Exposure would be expensive.
The situation cannot be controlled easily.
The feared event involves travel.
The stimulus would create genuine danger.
The client refuses direct exposure.
For example, flooding for a fear of flying may require substantial planning and expense.
Imaginal flooding
What is imaginal flooding?
Imaginal flooding involves asking the client to imagine an extremely fear-provoking situation in detail.
The therapist may guide the client through a vivid description of:
The feared object.
The setting.
The sensations experienced.
The feared sequence of events.
The client continues imagining the situation until anxiety decreases.
When imaginal flooding may be used
Imaginal exposure may be considered when real-life exposure is:
Impractical.
Expensive.
Difficult to organise.
Potentially unsafe.
Impossible to reproduce ethically.
Possible limitation
Imagined exposure may be less intense or realistic than direct exposure.
A client may:
Struggle to create a vivid image.
Avoid imagining the most frightening details.
Experience reduced anxiety in imagination but remain fearful in real life.
Successful imagined exposure does not automatically show that the person can manage the real situation.
Why anxiety eventually decreases
Flooding assumes that a person cannot maintain the highest level of physiological anxiety indefinitely.
At the beginning of exposure, anxiety may rise sharply.
The person may experience:
Intense fear.
Rapid breathing.
Muscular tension.
A strong urge to escape.
Difficulty concentrating.
Catastrophic thoughts.
If the person remains in the safe situation:
The expected disaster does not occur.
Physiological arousal eventually falls.
The person experiences the stimulus without escaping.
New learning becomes possible.
Typical anxiety pattern
Stage | Expected anxiety |
Before exposure | Anticipatory anxiety may be high |
Beginning of flooding | Anxiety rises sharply |
Continued exposure | Anxiety remains high for a period |
Prolonged safe exposure | Anxiety begins to decrease |
End of a successful session | Anxiety is substantially lower |
Later exposure | Fear may rise less strongly |
The precise pattern differs between individuals.
Extinction
What is extinction?
Extinction occurs when a conditioned stimulus is repeatedly presented without the unconditioned stimulus.
The conditioned response gradually weakens.
For example:
A dog has become associated with an attack.
During flooding, the client remains near a calm dog.
No attack occurs.
The dog is repeatedly experienced without pain or injury.
The conditioned fear response weakens.
Extinction is not erasing memory
The person does not necessarily forget the original frightening experience.
Instead, they learn that the conditioned stimulus no longer reliably predicts danger.
A new pattern develops:
Dog → no attack
This competes with the older association:
Dog → danger
Why avoidance prevents extinction
If the person always escapes, they never experience the conditioned stimulus safely.
They cannot learn that:
The feared event does not occur.
Anxiety can fall naturally.
They are able to cope.
Flooding makes extinction possible by preventing immediate avoidance.
Inhibitory learning
A useful way to understand improvement is that the client learns a new safety association.
The old prediction might be:
“Every dog will attack me.”
During flooding, the client experiences:
“I remained near this dog, and no attack occurred.”
The new experience does not guarantee that all dogs are safe.
It shows that the original belief is too broad.
The client begins learning:
The stimulus does not always predict harm.
Anxiety does not mean that danger is present.
Escape is not always required.
Fear can rise and fall naturally.
Flooding and negative reinforcement
Before treatment
The ordinary maintenance cycle is:
The person encounters the phobic stimulus.
Anxiety rises.
The person escapes.
Anxiety decreases.
Escape is reinforced.
During flooding
The treatment cycle becomes:
The person encounters the phobic stimulus.
Anxiety rises.
Escape is prevented.
The person remains in the situation.
Anxiety eventually decreases without escape.
The person learns that avoidance is not necessary.
Why this matters
The decrease in anxiety is no longer dependent on leaving.
This weakens the behavioural pattern maintaining the phobia.
Example: flooding for a dog phobia
Assessment
Aisha fears calm domestic dogs and avoids parks, friends’ homes and outdoor cafés.
She predicts:
“Any dog that comes near me will attack.”
Exposure
With informed consent, Aisha remains in a controlled setting with a calm dog and an experienced handler.
Beginning of the session
Aisha may experience:
Intense anxiety.
A strong desire to leave.
Selective attention to the dog’s movements.
The belief that an attack is imminent.
Prolonged exposure
Aisha remains in the situation.
The dog does not attack.
Her anxiety eventually begins to fall.
New learning
Aisha learns that:
Proximity to a calm dog does not automatically cause an attack.
Anxiety can fall without leaving.
She can remain near the dog.
Crossing the road is not always necessary.
Generalisation
Later sessions may involve:
Different calm dogs.
Different settings.
Dogs moving normally.
Everyday situations such as parks.
This helps prevent improvement from being restricted to one dog or therapy room.
Example: flooding for a lift phobia
Client’s fear
Ben believes that entering a lift will result in:
Becoming trapped.
Losing control.
Being unable to escape.
Flooding session
Ben enters a safe, functioning lift with professional support and completes repeated journeys.
Initial reaction
His anxiety rises sharply.
He may:
Monitor every sound.
Grip the handrail.
Experience an urge to press the emergency button.
Demand to leave.
Continued exposure
Ben remains in the lift.
The predicted disaster does not occur.
His anxiety eventually decreases.
Learning
Ben discovers that:
Ordinary lift sounds do not signal disaster.
Anxiety is unpleasant but temporary.
He can complete a journey.
Escape is not needed to reduce fear.
Example: imaginal flooding for flying
Real flights may be expensive and difficult to arrange repeatedly.
A therapist may ask a client to imagine:
Arriving at an airport.
Boarding the aircraft.
Hearing the doors close.
Experiencing take-off.
Encountering ordinary movement or noise.
Remaining on the flight.
The imagined scene should be sufficiently vivid to produce anxiety.
The client continues imagining it until the anxiety decreases.
Later real-life experience may still be required to establish that improvement transfers to actual flights.
Comparing flooding with systematic desensitisation
Flooding and gradual exposure combined with relaxation are both behavioural treatments.
Both aim to reduce learned fear through exposure.
However, their procedures differ substantially.
Main comparison
Systematic desensitisation | Flooding |
Uses gradual exposure | Uses immediate high-intensity exposure |
Begins with a mildly feared stimulus | Begins with a highly feared stimulus |
Uses an anxiety hierarchy | Does not require gradual progression through a hierarchy |
Includes relaxation training | Does not depend on relaxation training |
Uses reciprocal inhibition and counterconditioning | Relies mainly on prolonged exposure and extinction |
Usually takes several sessions | May work in fewer or longer sessions |
Usually produces manageable anxiety | Deliberately produces intense anxiety |
Gives the client gradual control over progress | Requires the client to tolerate high anxiety |
May be more acceptable to clients | May have higher refusal or withdrawal |
Can be more costly because it takes longer | May be less costly if completed quickly |
Similarities between the treatments
Both flooding and systematic desensitisation:
Are behavioural therapies.
Treat phobias through exposure.
Reduce avoidance.
Allow the client to experience the stimulus without the feared outcome.
Aim to weaken a learned fear response.
Can use imagined or real-life exposure.
Require cooperation and informed consent.
Can be evaluated through changes in anxiety and behaviour.
Shared link with the two-process model
Both treatments challenge negatively reinforced avoidance.
The client remains exposed rather than escaping.
This creates an opportunity for new learning.
Differences in exposure
Systematic desensitisation
Exposure progresses through increasingly difficult stages.
For a dog phobia, the client might begin with:
Reading the word “dog”.
Looking at a photograph.
Watching a video.
Viewing a dog from a distance.
Standing close to a calm dog.
Touching the dog.
Flooding
The client may begin by remaining directly near a calm dog for a prolonged period.
There is no requirement to complete the milder stages first.
Differences in anxiety
During systematic desensitisation
Anxiety should remain relatively manageable.
If a stage becomes overwhelming, the client may:
Return to a lower stage.
Repeat relaxation.
Divide the stage into smaller steps.
Delay progression.
During flooding
A high level of anxiety is expected.
The client must remain exposed despite the urge to escape.
The anxiety is allowed to rise and then decrease naturally.
Differences in treatment mechanisms
Reciprocal inhibition
Systematic desensitisation teaches relaxation because relaxation and intense anxiety are treated as incompatible responses.
Extinction
Flooding relies on prolonged exposure without the expected harmful outcome.
The conditioned fear response should weaken.
Counterconditioning and new learning
Both treatments can create new learning.
However, systematic desensitisation explicitly pairs the stimulus with relaxation, whereas flooding does not require a competing relaxation response.
Differences in speed
Flooding may produce improvement more rapidly because:
The person confronts the strongest fear immediately.
Time is not spent learning relaxation.
A hierarchy does not need to be worked through gradually.
Fewer treatment sessions may be required.
Systematic desensitisation is often slower because:
Relaxation must be taught.
The hierarchy is carefully constructed.
Each stage may need repetition.
Progress is gradual.
Differences in cost
Flooding may be cheaper when:
It requires fewer sessions.
Improvement is achieved quickly.
Less therapist time is required overall.
However, flooding is not automatically inexpensive.
Costs may increase when:
The real-life stimulus is difficult to arrange.
Travel is required.
More than one prolonged session is needed.
The client withdraws and requires alternative treatment.
Additional support is needed afterwards.
Systematic desensitisation may cost more because it usually involves several sessions, but it may be a better use of resources if clients are more likely to complete it.
Differences in acceptability
Systematic desensitisation is generally less distressing because exposure is gradual.
This may make it more acceptable to clients who:
Have severe anxiety.
Fear losing control.
Are uncertain about exposure.
Have previously escaped from intense situations.
Want greater control over progress.
Flooding may be less acceptable because clients know that they will experience intense anxiety.
Some may:
Refuse to begin.
Withdraw before completion.
Leave the situation too early.
Avoid seeking treatment altogether.
Comparing the treatments in an exam
The command word compare requires similarities or differences to be made explicit.
A weak answer gives two separate descriptions:
Systematic desensitisation uses a hierarchy. Flooding involves exposure.
A stronger comparison states:
Systematic desensitisation exposes the client gradually through an anxiety hierarchy, whereas flooding exposes the client immediately to a highly feared situation.
Useful comparison words include:
Whereas.
In contrast.
Both.
Unlike.
Similarly.
However.
Evaluating the effectiveness of flooding
What does effectiveness mean?
Effectiveness refers to whether flooding successfully reduces a phobia.
Possible indicators include:
Lower self-reported anxiety.
Reduced avoidance.
Ability to approach the stimulus.
Improved everyday functioning.
Benefits maintained at follow-up.
Improvement across several settings.
Strength: flooding directly prevents avoidance
Avoidance is a major behavioural feature of phobias.
Flooding directly removes the person’s opportunity to escape.
This is valuable because escape normally reduces anxiety and reinforces future avoidance.
By remaining in the situation, the client learns that anxiety can decrease without escape.
Strength: prolonged exposure permits extinction
The client experiences the conditioned stimulus without the expected harmful event.
For example:
The person remains near a dog.
No attack occurs.
The learned connection between dogs and danger weakens.
This gives flooding a clear behavioural rationale.
Strength: treatment may work rapidly
Flooding may reduce symptoms in fewer sessions than gradual treatment.
A rapid treatment may benefit clients whose phobia prevents:
Essential travel.
Medical treatment.
Education.
Employment.
Important family activities.
A shorter treatment may restore functioning sooner.
Strength: it may be cost-effective
Fewer sessions can reduce:
Therapist time.
Appointment costs.
Travel costs.
Time away from work or education.
This may make flooding economically attractive when the client completes treatment successfully.
Strength: outcomes can be measured behaviourally
The therapist can measure whether the client can:
Enter the feared environment.
Remain near the stimulus.
Complete a journey.
Reduce avoidance.
Complete a previously impossible activity.
Behavioural measures provide evidence beyond the client simply saying that they feel better.
Limitation: fear may return
Improvement in one session may not last.
A return of fear may occur if:
The client does not continue practising.
They encounter a new frightening event.
Treatment occurs in only one setting.
The exposure is too different from everyday situations.
The person begins avoiding again.
Follow-up evidence is needed to demonstrate lasting effectiveness.
Limitation: improvement may be stimulus-specific
A person may become comfortable with:
One particular dog.
but remain frightened of:
Other breeds.
Dogs in parks.
Barking.
Rapid movement.
Unfamiliar dogs.
Treatment should include varied examples when safe and appropriate.
Otherwise, new learning may fail to generalise.
Limitation: imaginal flooding may not transfer
A client may become less anxious while imagining a feared situation but remain unable to confront it in real life.
For example, imagining a flight in the therapist’s office may not reproduce:
Aircraft noise.
Restricted movement.
Take-off.
Turbulence.
Loss of control over the journey.
Real-life assessment is needed before concluding that the phobia has been treated effectively.
Limitation: withdrawal reduces effectiveness
Flooding cannot work as intended if the client:
Refuses treatment.
Leaves early.
Avoids future sessions.
Terminates therapy before anxiety falls.
Early escape may reinforce avoidance because relief immediately follows leaving.
This could strengthen rather than reduce the phobia.
Limitation: behavioural improvement may hide anxiety
A client may complete the exposure while still experiencing considerable distress.
For example, they may enter a lift but:
Remain extremely anxious.
Depend on a therapist.
Use several safety behaviours.
Avoid lifts outside treatment.
Behavioural approach alone does not prove emotional recovery.
Effective assessment should consider:
Behaviour.
Self-reported anxiety.
Everyday functioning.
Independence from support.
Follow-up outcomes.
Evaluating the appropriateness of flooding
What does appropriateness mean?
Appropriateness refers to whether flooding is suitable for:
The particular client.
The particular phobia.
The client’s physical and psychological circumstances.
The available setting.
Ethical requirements.
The client’s preferences.
A treatment may be effective for some people but inappropriate for others.
Strength: useful when rapid treatment is important
Flooding may be appropriate when the phobia is preventing an urgent or essential activity.
For example, the person may need to:
Receive necessary medical care.
Travel for an important reason.
Return to employment.
Use an essential form of transport.
A rapid intervention may be valuable if the client understands and accepts the procedure.
Strength: useful for a clear, specific fear
Flooding may be easier to organise when:
The feared stimulus is clearly identifiable.
The situation can be reproduced safely.
The feared outcome can be tested.
The client’s avoidance behaviour is clear.
Examples might include fears of:
Dogs.
Lifts.
Particular enclosed spaces.
Spiders.
Heights in a controlled environment.
Limitation: treatment is highly distressing
Flooding deliberately exposes the client to intense fear.
This may involve:
Severe anxiety.
Panic.
A powerful urge to escape.
Emotional exhaustion.
Temporary loss of confidence.
The client may experience more distress than during systematic desensitisation.
Ethical concern: protection from harm
Therapists have a responsibility to protect clients from unnecessary psychological harm.
Flooding creates a difficult ethical balance:
High anxiety is part of the treatment.
Excessive or poorly managed distress may harm the client.
Leaving too early may reinforce avoidance.
The person must remain free to withdraw.
Careful preparation and informed consent are essential.
Limitation: some clients will refuse it
A person seeking help for an intense fear may be unwilling to confront that fear immediately.
The suggestion of flooding may cause them to:
Refuse treatment.
Avoid therapy.
Miss appointments.
Choose no treatment rather than intense exposure.
A theoretically rapid therapy is not useful if the client will not begin it.
Limitation: greater risk of treatment dropout
The client may agree initially but find the exposure intolerable.
If they leave:
Treatment is incomplete.
Anxiety may remain high.
Escape may be negatively reinforced.
Confidence in therapy may decrease.
Future treatment may be harder to begin.
Systematic desensitisation may therefore be more appropriate for clients who need gradual progress.
Limitation: requires genuine informed consent
A client cannot give fully informed consent unless they understand:
How intense the exposure may be.
Why remaining in the situation matters.
That anxiety may rise before falling.
The alternatives available.
Their right to withdraw.
Professionals should not minimise the likely distress merely to secure agreement.
Limitation: not appropriate for genuine danger
Flooding should involve a feared but safely controlled situation.
It would be inappropriate to expose a person to:
An aggressive animal.
An unsafe height.
A dangerous enclosed environment.
A medically unnecessary risk.
Any situation in which the predicted harm could genuinely occur.
The aim is to correct an excessive fear, not to prove that all danger is imaginary.
Limitation: health considerations
The intense physiological response may make flooding unsuitable for some clients.
Professional assessment should consider whether the treatment could create unacceptable risks.
The decision should be based on the individual rather than assuming that everyone can safely tolerate the same level of arousal.
Limitation: client control is reduced
The client gives consent, but the procedure provides less gradual control than systematic desensitisation.
The person cannot:
Begin with a very mild stimulus.
Progress through small stages.
Develop confidence gradually.
Pause between every small step.
This may make the therapy feel overwhelming.
Limitation: complex phobias may require more than exposure
Some fears involve complex beliefs about:
Humiliation.
Social judgement.
Responsibility.
Loss of control.
Personal inadequacy.
Exposure may reduce avoidance but leave these beliefs largely unchanged.
For example, a person may remain in a social situation while continuing to believe that every small mistake proves they are unacceptable.
A treatment addressing thought processes may also be required.
Comparison of appropriateness
Consideration | Flooding | Systematic desensitisation |
Client distress | Very high initially | Usually lower and more manageable |
Client control | Less gradual control | Greater control over progression |
Time | Potentially rapid | Usually slower |
Cost | Potentially lower | May be higher due to more sessions |
Refusal and dropout | More likely | Less likely |
Preparation | Assessment and consent | Assessment, relaxation and hierarchy |
Suitable client | Motivated and able to tolerate intense exposure | Client preferring gradual treatment |
Ethical acceptability | Greater concern because of intense distress | Usually easier to justify |
Speed of practical improvement | May be faster | Usually gradual |
Risk of reinforcing escape | High if the client leaves early | Lower because steps are manageable |
Is flooding always faster?
Flooding is designed to be rapid, but the total treatment journey may not always be shorter.
It may become inefficient if:
The client refuses it.
They withdraw early.
Anxiety does not fall sufficiently.
Additional sessions are needed.
They later require systematic desensitisation.
Fear returns after treatment.
A slower treatment completed successfully may be more efficient than a rapid treatment that is abandoned.
Is flooding always cheaper?
Fewer sessions can reduce cost.
However, overall cost depends on:
Therapist time.
Location.
Access to the feared stimulus.
Travel.
Safety arrangements.
Withdrawal.
Additional treatment.
Follow-up support.
For example, flooding for a spider phobia may be relatively straightforward to organise.
Flooding for a fear of flying could be much more expensive.
Individual differences
Not every client responds in the same way.
Flooding may be more acceptable to someone who:
Wants rapid treatment.
Understands the behavioural rationale.
Is highly motivated.
Has a clearly defined fear.
Has agreed fully to intense exposure.
It may be less appropriate for someone who:
Finds even discussion of the stimulus overwhelming.
Has previously abandoned exposure.
Prefers gradual progress.
Lacks confidence in their ability to cope.
Has health or psychological factors requiring particular care.
Treatment selection should therefore be individualised.
The role of safety behaviours
A client may remain in the feared situation but use behaviours they believe prevent danger.
Examples include:
Gripping a trusted person.
Standing beside an exit.
Continuously checking the environment.
Carrying a protective object.
Demanding repeated reassurance.
These behaviours may reduce the effectiveness of flooding.
The client may conclude:
“Nothing bad happened because I used the safety behaviour.”
They may not learn that the situation itself was safe.
A successful treatment should gradually reduce unnecessary safety behaviours where appropriate.
Flooding and the client’s thoughts
Flooding is a behavioural therapy, but it can also change cognition through experience.
Before treatment, the person may believe:
“The dog will certainly attack.”
“My anxiety will continue forever.”
“I will not cope.”
“If I enter the lift, I will lose control.”
During successful exposure, the person learns:
The predicted danger did not occur.
Anxiety eventually decreased.
They remained in the situation.
They coped better than expected.
This may weaken the irrational beliefs and cognitive distortions associated with phobias.
However, flooding does not usually involve the same structured discussion of beliefs as a cognitive therapy.
Applying flooding to unfamiliar scenarios
Scenario 1: fear of spiders
Maya avoids every room in which a spider has been seen.
A flooding treatment might involve:
Explaining the procedure and obtaining informed consent.
Assessing Maya’s fear and health.
Placing Maya in a controlled room with a harmless spider.
Encouraging her to remain despite intense anxiety.
Preventing immediate escape.
Continuing exposure until anxiety decreases.
Repeating or varying exposure if required.
Maya learns that:
The spider does not harm her.
Anxiety falls without leaving.
Escape is not necessary.
Scenario 2: fear of lifts
Elliot uses stairs even when this causes serious practical problems.
Flooding could involve:
Entering a safe lift.
Completing repeated journeys.
Remaining despite anxiety.
Experiencing ordinary lift sounds and movements.
Learning that the lift functions safely.
Discovering that anxiety falls without escape.
Scenario 3: fear of dogs
Tariq crosses the road whenever he sees a dog.
A controlled flooding session could involve:
Remaining near a calm dog and professional handler.
Preventing Tariq’s usual escape response.
Continuing exposure until anxiety falls.
Later using different calm dogs and locations.
Using only one animal may produce improvement that is too narrow.
Scenario 4: refusal of flooding
Lucy has a severe needle phobia.
She agrees that treatment is necessary but refuses immediate direct exposure.
Flooding may be inappropriate because:
The client does not consent to the procedure.
Forcing exposure would be unethical.
Withdrawal could strengthen avoidance.
Systematic desensitisation may be more acceptable.
Scenario 5: early escape
During flooding for a fear of enclosed spaces, Marcus leaves the room as soon as anxiety reaches its highest level.
This may reduce effectiveness because:
Anxiety falls immediately after escape.
Escape is negatively reinforced.
Marcus does not experience anxiety decreasing while remaining.
Extinction or new safety learning cannot occur fully.
Scenario 6: imagined success but real-life avoidance
A client completes imaginal flooding for air travel and reports low anxiety while imagining a flight.
They still refuse to enter an airport.
This suggests limited generalisation because:
Imagined exposure did not transfer to real behaviour.
The treatment outcome should not be judged from self-report alone.
Real-life exposure or a different treatment stage may be needed.
Evaluating treatment data
Imagine a study compares flooding and systematic desensitisation.
Anxiety is measured from 0, no anxiety, to 10, extreme anxiety.
Treatment | Mean anxiety before treatment | Mean anxiety after treatment | Completion rate |
Flooding | 8.6 | 3.1 | 62% |
Systematic desensitisation | 8.4 | 3.4 | 89% |
A careful interpretation would state:
Both groups showed a substantial fall in mean anxiety.
Flooding produced a slightly lower post-treatment mean among those measured.
Systematic desensitisation had a higher completion rate.
Flooding may be effective for clients who complete it.
The lower completion rate raises concerns about appropriateness and acceptability.
The table does not show long-term outcomes.
The table does not show whether the groups were randomly allocated.
Mean scores may hide individual differences.
Participants who withdrew may be missing from the post-treatment average.
Effectiveness and dropout
Suppose only successful completers are included in the flooding mean.
The treatment may appear highly effective while excluding people who found it intolerable.
A fair evaluation should consider:
Improvement among completers.
Refusal rate.
Withdrawal rate.
Adverse experiences.
Follow-up outcomes.
Everyday functioning.
Researching flooding effectiveness
Suitable comparison groups
A study could compare flooding with:
Systematic desensitisation.
A waiting-list group.
Another exposure treatment.
The same participants’ functioning before treatment.
Random allocation
Random allocation helps reduce differences between treatment groups.
Without it, people selecting flooding may be:
More motivated.
Less fearful.
More tolerant of distress.
More confident that exposure will work.
These differences could explain better outcomes.
Standardisation
A standardised procedure may improve reliability.
However, flooding must still be adapted to:
The particular phobia.
The individual client.
Health and safety.
The feared outcome.
Too much standardisation may reduce appropriateness.
Outcome measures
Useful measures include:
Anxiety questionnaires.
Behavioural approach tests.
Frequency of avoidance.
Attendance at work or education.
Ability to complete a practical task.
Follow-up assessment.
No single measure provides a complete account.
Answering comparison questions
Weak comparison
Flooding exposes people to fear. Systematic desensitisation uses relaxation.
This identifies facts but does not develop the relationship clearly.
Stronger comparison
Both treatments use exposure, but flooding begins immediately with a highly feared stimulus, whereas systematic desensitisation progresses gradually through an anxiety hierarchy.
Further developed comparison
Flooding may require fewer sessions and therefore cost less, whereas systematic desensitisation is slower because relaxation must be taught and each hierarchy stage completed. However, the gradual procedure is usually less distressing and may produce a higher completion rate.
Answering evaluation questions
Effectiveness paragraph
Flooding may be effective because prolonged exposure prevents avoidance and allows the conditioned fear response to weaken. The client experiences the feared stimulus without the expected harmful outcome and learns that anxiety can decrease without escape. However, this process depends on remaining in the situation long enough, so withdrawal may prevent improvement and reinforce avoidance.
Appropriateness paragraph
Flooding may be less appropriate than systematic desensitisation because it deliberately produces intense anxiety. Some clients may refuse treatment or withdraw before anxiety falls. A gradual hierarchy may therefore be more acceptable, even though it takes longer.
Cost paragraph
Flooding may be cost-effective because fewer sessions are required. This could reduce therapist time and allow a client to return to ordinary activities quickly. However, cost savings may be lost if the client abandons treatment and later requires another therapy.
Ethical paragraph
The treatment creates a risk of psychological distress because the client confronts their strongest fear immediately. Informed consent and careful assessment are therefore essential. The client must understand the intensity of the procedure and cannot ethically be forced to remain.
Generalisation paragraph
Improvement may not generalise beyond the exact treatment stimulus. A client treated using one calm dog may continue fearing unfamiliar dogs or barking. Exposure should therefore include appropriate variation and follow-up in everyday settings.
Planning an extended answer
A strong extended response could follow this structure:
Define flooding.
Explain immediate high-intensity exposure.
Explain prolonged exposure.
Explain prevention of avoidance.
Explain extinction or new safety learning.
Apply flooding to a phobia.
Compare it with systematic desensitisation.
Discuss speed and cost.
Discuss effectiveness for clients who complete treatment.
Discuss refusal and dropout.
Discuss intense distress and ethical concerns.
Consider generalisation and relapse.
Consider suitability for different phobias and clients.
Reach a balanced conclusion.
A balanced assessment
Flooding has a clear behavioural rationale.
It may be effective because it:
Prevents avoidance.
Allows anxiety to decrease without escape.
Weakens learned fear.
Challenges catastrophic expectations.
May produce rapid practical improvement.
Can require fewer sessions.
However, its appropriateness is limited by:
Intense distress.
Possible refusal.
High withdrawal risk.
Ethical concerns.
Health considerations.
Problems arranging real-life exposure.
Limited generalisation.
The possibility that fear will return.
Compared with systematic desensitisation, flooding is usually:
Faster.
More intense.
Potentially cheaper.
Less acceptable.
Less gradual.
More dependent on the client tolerating high anxiety.
The most justified conclusion is:
Flooding can be an effective and economical treatment for a clearly defined phobia when a fully informed and motivated client completes prolonged exposure. Systematic desensitisation is likely to be more appropriate when the client requires gradual, less distressing treatment.
Key Words 🔑
Key word | Student-friendly definition | How it may be used in an exam |
Flooding | A behavioural treatment involving immediate, prolonged exposure to a highly feared stimulus. | Define the treatment and describe its procedure. |
Behavioural therapy | Treatment based on changing learned behaviour through learning principles. | Link flooding to conditioning. |
Exposure | Confronting the feared object or situation. | Explain the central treatment procedure. |
High-intensity exposure | Encountering a strongly feared stimulus from the beginning of treatment. | Distinguish flooding from gradual exposure. |
Prolonged exposure | Remaining with the feared stimulus for an extended period. | Explain why immediate escape must be prevented. |
Avoidance | Staying away from or escaping a feared stimulus. | Explain the behaviour flooding aims to interrupt. |
Escape behaviour | Leaving after the feared stimulus has been encountered. | Explain how early departure may reinforce fear. |
Negative reinforcement | Increasing behaviour because it removes an unpleasant experience. | Explain how relief maintains avoidance. |
Extinction | Weakening of a conditioned response when the conditioned stimulus occurs without the unconditioned stimulus. | Explain why fear may decrease during flooding. |
Conditioned stimulus | A previously neutral stimulus that produces a learned response. | Identify the feared object during treatment. |
Conditioned response | A learned response produced by a conditioned stimulus. | Identify the phobic fear being weakened. |
Response prevention | Preventing the person from performing their usual escape or avoidance response. | Explain why the client remains exposed. |
In vivo flooding | Direct exposure to the real feared stimulus. | Compare real and imagined exposure. |
Imaginal flooding | Vividly imagining the most feared situation. | Explain an alternative when direct exposure is impractical. |
Generalisation | Transfer of learning to related stimuli or settings. | Evaluate whether improvement extends beyond therapy. |
Relapse | Return of fear after improvement. | Evaluate long-term effectiveness. |
Informed consent | Agreement to treatment after receiving sufficient information. | Evaluate the ethics of intense exposure. |
Effectiveness | The extent to which treatment successfully reduces the phobia. | Discuss anxiety, avoidance and follow-up outcomes. |
Appropriateness | The extent to which treatment is suitable for a client and situation. | Discuss distress, consent, health and client preference. |
Systematic desensitisation | A behavioural treatment using relaxation and gradual exposure through a hierarchy. | Compare it directly with flooding. |
Treatment dropout | Leaving treatment before it has been completed. | Evaluate acceptability and outcome data. |
Safety behaviour | An action believed to prevent danger during exposure. | Explain why new safety learning may be incomplete. |
Hints from the Examiner Reports 💡
Examiner hint: State that exposure is immediate and intense. Simply saying that the client is exposed to the feared stimulus does not distinguish flooding from systematic desensitisation.
Examiner hint: Explain why the client remains exposed. The purpose is to allow anxiety to decrease without escape and to experience the stimulus without the expected harmful outcome.
Examiner hint: Do not claim that flooding uses an anxiety hierarchy. A gradual hierarchy belongs to systematic desensitisation.
Examiner hint: Compare the treatments directly. Use terms such as “whereas”, “both” and “in contrast” rather than writing two disconnected descriptions.
Examiner hint: Separate effectiveness from appropriateness. Effectiveness concerns whether symptoms improve. Appropriateness concerns whether the therapy is suitable and acceptable.
Examiner hint: When discussing cost, explain the complete argument. Flooding may require fewer sessions, but withdrawal and later treatment could remove the economic advantage.
Examiner hint: Ethical evaluation should refer specifically to intense anxiety, informed consent, protection from harm and the client’s right to withdraw.
Examiner hint: Application requires details from the scenario. Describe exactly what feared situation the person would confront and what they would learn by remaining.
Common Mistakes ⚠️
Mistake: Saying flooding uses gradual exposure
Why this is incorrect:
Gradual exposure is a feature of systematic desensitisation.
How to improve:
State that flooding begins with immediate exposure to a highly feared stimulus.
Mistake: Saying flooding uses an anxiety hierarchy
Why this is incorrect:
A hierarchy ranks gradual stages in systematic desensitisation.
How to improve:
Explain that flooding begins near the top level of fear.
Mistake: Including relaxation training as an essential stage
Why this is incorrect:
Relaxation and reciprocal inhibition are central to systematic desensitisation, not flooding.
How to improve:
Focus on prolonged exposure, prevention of escape and reduction of anxiety.
Mistake: Saying the client is briefly shown the feared object
Why this is incomplete:
Brief exposure followed by escape may reinforce avoidance.
How to improve:
Explain that exposure continues until anxiety falls substantially.
Mistake: Saying the therapist physically prevents the client leaving
Why this is unethical and inaccurate:
The client gives informed consent and retains the right to withdraw.
How to improve:
State that the client agrees to remain and is encouraged not to escape.
Mistake: Saying flooding eliminates fear instantly
Why this is inaccurate:
Anxiety usually rises sharply before it decreases.
How to improve:
Describe the expected anxiety curve.
Mistake: Saying anxiety continues rising indefinitely
Why this contradicts the rationale:
Flooding assumes that the highest level of arousal cannot be maintained forever.
How to improve:
Explain that anxiety eventually falls during prolonged safe exposure.
Mistake: Saying extinction means forgetting the original event
Why this is incorrect:
Extinction weakens the conditioned response.
How to improve:
Explain that the person learns the stimulus no longer reliably predicts harm.
Mistake: Saying avoidance is punished
Why this is incorrect:
Ordinary avoidance is negatively reinforced because it removes anxiety.
How to improve:
Explain that flooding prevents the reinforced escape response.
Mistake: Calling negative reinforcement a harmful consequence
Why this is incorrect:
Negative means removal, and reinforcement means behaviour increases.
How to improve:
State that avoidance increases because anxiety is removed.
Mistake: Assuming flooding is always more effective
Why this is too absolute:
Some clients refuse or abandon the procedure.
How to improve:
Distinguish outcomes among completers from overall acceptability.
Mistake: Assuming flooding is always cheaper
Why this is incomplete:
It may require fewer sessions, but practical arrangements or dropout can increase cost.
How to improve:
Develop both sides of the economic argument.
Mistake: Saying systematic desensitisation and flooding are completely unrelated
Why this is incorrect:
Both are behavioural exposure treatments.
How to improve:
State the shared principle before explaining procedural differences.
Mistake: Comparing only the length of treatment
Why this is incomplete:
The treatments also differ in intensity, relaxation, client control and acceptability.
How to improve:
Develop several direct comparisons.
Mistake: Evaluating distress without considering consent
Why this is incomplete:
Intense anxiety is ethically relevant because clients must understand and agree to it.
How to improve:
Link distress with informed consent and protection from harm.
Mistake: Saying flooding exposes clients to genuine danger
Why this is incorrect:
Exposure should be conducted within a safely controlled situation.
How to improve:
Distinguish perceived danger from actual risk.
Mistake: Ignoring treatment dropout
Why this weakens evaluation:
Flooding cannot produce extinction if the client leaves while anxiety is high.
How to improve:
Explain how withdrawal may reinforce escape.
Mistake: Using one successful session as proof of long-term effectiveness
Why this is insufficient:
Fear may return or remain in other settings.
How to improve:
Discuss follow-up, relapse and generalisation.
Mistake: Giving a generic application
Why this loses AO2 marks:
The answer must use the particular feared object or situation.
How to improve:
Describe exactly what the named person would confront and what feared outcome would fail to occur.
Exam-Style Questions ✍️
Question 1
Which one of the following best describes flooding?
A. Gradual exposure combined with relaxation
B. Immediate and prolonged exposure to a highly feared stimulus
C. Avoiding the feared stimulus until anxiety disappears
D. Challenging irrational beliefs through verbal discussion
[1 mark]
Question 2
Define extinction in the context of flooding.
[2 marks]
Question 3
Explain why exposure must be prolonged during flooding.
[3 marks]
Question 4
Outline two differences between flooding and systematic desensitisation.
[4 marks]
Question 5
Kian has a severe fear of lifts. He always uses stairs and becomes anxious whenever he hears a lift moving.
Explain how flooding could be used to treat Kian’s phobia.
[6 marks]
Question 6
A client leaves a flooding session while their anxiety is at its highest level.
Use your knowledge of operant conditioning to explain why leaving at this point might maintain the phobia.
[4 marks]
Question 7
The table shows the results of two phobia treatments.
Treatment | Mean anxiety before treatment | Mean anxiety after treatment | Percentage completing treatment |
Flooding | 8.7 | 3.0 | 61% |
Systematic desensitisation | 8.5 | 3.5 | 88% |
Describe the pattern shown in the table. Explain one conclusion and one limitation of the results.
[6 marks]
Question 8
Explain one reason why flooding may be more cost-effective than systematic desensitisation and one reason why it may not be.
[6 marks]
Question 9
Discuss the appropriateness and effectiveness of flooding as a treatment for phobias.
[8 marks]
Question 10
Discuss flooding as a behavioural treatment for phobias. In your answer, compare flooding with systematic desensitisation.
[16 marks]
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