The Ethological Explanation of Aggression | AQA A-Level Psychology Revision
Updated: Sep 19
For 7182 specification, first teach in September 2025
AQA A-Level Psychology | Free Revision Notes
Estimated study time: 55 to 70 minutes
The ethological explanation A-Level Psychology revision examines aggression as an innate, species-specific behaviour that may be triggered by particular environmental cues. You will learn how an innate releasing mechanism responds to a sign stimulus and produces a fixed action pattern. This explanation builds on the biological influences studied in earlier explanations of aggression, while introducing the animal research that also underpins the next lesson on evolutionary accounts.
The AQA specification requires knowledge of the ethological explanation of aggression, including innate releasing mechanisms and fixed action patterns.
Learning Objectives 🎯
By the end of this revision page, you should be able to:
Define ethology, innate releasing mechanisms and fixed action patterns.
Explain how a sign stimulus activates an innate releasing mechanism.
Explain how an innate releasing mechanism produces a fixed action pattern.
Apply the ethological explanation to unfamiliar examples of aggressive behaviour.
Distinguish an innate releasing mechanism from a fixed action pattern.
Evaluate the ethological explanation of aggression.
Revision Notes đź“š
The Ethological Explanation A-Level Psychology Revision Focus
Ethology is the scientific study of animal behaviour, particularly behaviour observed within the environment in which it naturally occurs.
The ethological explanation proposes that some behaviours are:
Innate, meaning they are inherited rather than learned.
Species-specific, meaning they are characteristic of members of a particular species.
Triggered by particular features of the environment.
Adaptive because they have helped members of a species survive or reproduce.
Aggression may be adaptive when it helps an animal:
Defend its territory.
Protect its offspring.
Compete for resources.
Deter rivals.
Maintain access to food or mates.
The ethological explanation focuses mainly on the immediate biological process through which an aggressive response is released. The adaptive value of aggression is developed more fully in why aggressive tendencies may have been selected.
Innate Behaviour
An innate behaviour is present without the individual having to learn it through observation, reinforcement or direct experience.
This does not necessarily mean that the behaviour appears immediately after birth. An innate behaviour may become possible only when the animal has reached a particular stage of physical development.
Innate behaviour is contrasted with learned behaviour:
Innate behaviour | Learned behaviour |
Has an inherited basis | Develops through experience |
Does not require observation or reinforcement | May depend on modelling, reinforcement or practice |
Tends to be found across members of a species | May differ considerably between individuals |
Is often triggered by a particular environmental cue | May occur because similar behaviour was rewarded previously |
The distinction is important when comparing ethology with aggression acquired through modelling and reinforcement.
Innate Releasing Mechanisms
An innate releasing mechanism, usually shortened to IRM, is a hard-wired, inherited neural mechanism that responds to a particular environmental stimulus.
It can be thought of as an inbuilt neural system that:
Detects a relevant external cue.
Activates when that cue is present.
Releases the energy required for a particular response.
Produces a fixed pattern of behaviour.
An IRM is therefore not the visible aggressive behaviour itself. It is the internal neural mechanism that releases the behaviour.
AQA’s 2024 mark scheme identifies three essential parts of an accurate explanation:
The IRM consists of hard-wired, inherited neural circuits.
It is activated by an external stimulus or sign stimulus.
Its activation produces a fixed behavioural response, known as a fixed action pattern.
The Neural Basis of an IRM
The phrase neural mechanism is essential.
An IRM is understood as an inherited network of neuronal connections within the nervous system. Because the neural circuit is already present, the animal does not need to learn how to perform the response.
This connects the ethological explanation with brain-based explanations of aggression. However, the two lessons have different emphases:
Neural explanations focus on particular brain structures and neurotransmitters.
Ethological explanations focus on an inherited neural mechanism that releases a species-specific behavioural sequence.
⚠️ In an examination, stating only that an IRM is “something that causes aggression” is too vague. You need to identify its inherited neural basis and explain how an environmental cue activates it.
Sign Stimuli and Releasers
A sign stimulus is a specific feature of the environment that activates an innate releasing mechanism.
The term releaser may also be used because the stimulus releases the fixed response.
A sign stimulus could be:
A colour.
A shape.
A movement.
A sound.
A posture.
A smell.
A particular combination of features.
The whole object does not always need to be recognised. A particular feature may be enough to activate the mechanism.
The sequence is:
Sign stimulus → innate releasing mechanism → fixed action pattern
The environmental stimulus does not teach the animal how to behave. Instead, it activates a behavioural response that is already biologically prepared.
Example: Aggression in Male Sticklebacks
AQA has accepted the aggressive response of a male stickleback as an example of an innate releasing mechanism.
During the relevant period, the red or orange underside of another male can act as a sign stimulus. This activates the observing male’s innate releasing mechanism and produces an aggressive display, such as raising the operculum.
The important sequence is:
The red or orange feature is detected.
The inherited neural mechanism is activated.
Action-specific energy is released.
The aggressive fixed action pattern occurs.
The response is triggered by the relevant feature, rather than by a learned judgement about whether the other object is genuinely a rival. The stickleback example is specifically recognised in the June 2024 AQA mark scheme.
Action-Specific Energy
The ethological explanation proposes that an IRM releases action-specific energy.
This means that the animal is biologically prepared to perform a particular behaviour. When the appropriate sign stimulus is detected, the stored readiness for that response is released.
The energy is described as action-specific because it is connected to a particular form of behaviour. An aggressive IRM therefore releases an aggressive response rather than an unrelated behaviour.
The basic process is:
The animal has an inherited readiness to perform an aggressive response.
A relevant sign stimulus appears.
The innate releasing mechanism is activated.
Action-specific energy is released.
The fixed action pattern is performed.
The concept should not be interpreted as a measurable physical substance. It describes the biological readiness for the behaviour to occur.
Fixed Action Patterns
A fixed action pattern, usually shortened to FAP, is an innate, relatively unchanging sequence of behaviour that is triggered by an innate releasing mechanism.
The FAP is the observable response. It is different from the IRM, which is the internal neural process.
Innate releasing mechanism | Fixed action pattern |
An inherited neural mechanism | An observable sequence of behaviour |
Exists within the nervous system | Is performed by the animal |
Is activated by a sign stimulus | Is the response released by the IRM |
Explains how the behaviour is triggered | Describes what the animal then does |
A concise distinction is:
The IRM is the inherited neural mechanism, whereas the FAP is the fixed behavioural sequence it releases.
Characteristics of Fixed Action Patterns
Fixed action patterns have several important characteristics.
They are innate
The response does not need to be learned through modelling, reinforcement or practice.
They are species-specific
Members of the same species tend to show a recognisable version of the behavioural sequence.
They are stereotyped
The response is performed in a broadly similar way each time it occurs.
They are triggered by a sign stimulus
The appropriate environmental cue activates the innate releasing mechanism that produces the response.
They tend to run to completion
Once the sequence has begun, it tends to continue through its remaining stages, even if the original stimulus is removed.
They have a particular function
A fixed action pattern serves a recognisable purpose, such as defence, courtship, feeding or aggression.
Are Fixed Action Patterns Completely Fixed?
The word fixed should not be interpreted as meaning that every movement is identical on every occasion.
A fixed action pattern is relatively predictable and species-typical, but behaviour may still be affected by:
The animal’s physical condition.
The strength of the stimulus.
The presence of competing stimuli.
Previous experience.
Features of the immediate environment.
This is important when evaluating the explanation. Some aggressive behaviour is more flexible than the idea of a completely fixed sequence suggests.
A careful definition is therefore:
A fixed action pattern is an innate, relatively stereotyped sequence of behaviour released by a specific stimulus.
How IRMs and FAPs Work Together
The complete ethological process can be organised into four stages.
Stage 1: A sign stimulus appears
The animal detects a particular feature of the environment, such as the colour, movement or posture of a potential rival.
Stage 2: The innate releasing mechanism is activated
The sign stimulus activates a hard-wired neural circuit.
Stage 3: Action-specific energy is released
The neural mechanism releases the biological readiness for the response.
Stage 4: The fixed action pattern occurs
The animal performs a relatively predictable behavioural sequence, such as an aggressive display or attack.
Stage | Part of the explanation | Example |
1 | Sign stimulus | A male stickleback detects a red or orange underside |
2 | Innate releasing mechanism | The inherited neural circuit is activated |
3 | Release | Action-specific energy for aggression is released |
4 | Fixed action pattern | The fish performs an aggressive display |
Applying the Explanation to an Unfamiliar Animal
Consider this example:
Male birds of one species usually ignore models placed near their nests. However, they immediately perform the same threat display whenever a model has a bright patch on its head.
An ethological explanation would suggest:
The bright patch is the sign stimulus.
It activates an inherited innate releasing mechanism.
The neural mechanism releases the aggressive response.
The threat display is a fixed action pattern.
The response is likely to have an adaptive defensive function.
A weak answer would state:
The bird is aggressive because it sees the model.
A stronger answer identifies every stage of the mechanism:
The bright patch acts as a sign stimulus that activates an inherited neural circuit. This innate releasing mechanism releases the species-specific threat display, which is the fixed action pattern.
Applying the Explanation to Human Aggression
Application to human behaviour must be cautious.
An ethological account might propose that:
Humans have inherited biological tendencies towards aggression.
Certain environmental cues may activate aggressive readiness.
Threatening facial expressions, invasion of space or signs of rivalry might act as releasers.
The resulting aggressive response may have had an adaptive value.
However, human aggression is rarely a simple, unchanging behavioural sequence. People can:
Interpret the same cue differently.
Think about the likely consequences.
Control an impulse.
Follow social rules.
Learn alternative responses.
Choose between verbal, physical or indirect aggression.
The ethological explanation may therefore identify an innate contribution to human aggression without fully explaining its complexity.
Ethological and Evolutionary Explanations
Ethological and evolutionary explanations are closely related but should not be treated as identical.
Ethological explanation | Evolutionary explanation |
Focuses on the immediate mechanism that produces behaviour | Focuses on why a behavioural tendency developed |
Explains how a sign stimulus activates an IRM | Explains how behaviour may promote survival or reproduction |
Describes the fixed action pattern | Describes the adaptive advantage of aggression |
Often investigates species-specific animal behaviour | Applies natural selection to inherited aggressive tendencies |
For example:
The ethological explanation asks how the sight of a rival triggers an aggressive display.
The evolutionary explanation asks why responding aggressively to rivals may have improved reproductive success.
This distinction prepares you for the adaptive functions of human aggression.
Strength: Supporting Evidence for Sign Stimuli
A strength of the ethological explanation is that sign stimuli and fixed responses can be investigated systematically.
Researchers can:
Present different versions of a stimulus.
Alter one feature at a time.
Record whether an aggressive response occurs.
Compare responses across members of the same species.
The stickleback example supports the proposed mechanism because a red or orange feature can trigger an aggressive display. The response to a particular feature is consistent with the idea that a sign stimulus activates an inherited neural mechanism.
This evidence is valuable because it goes beyond merely observing that animals fight. It tests which environmental feature releases the response.
Strength: Objective Observation
Ethological research often investigates observable behaviour.
An aggressive response can be operationalised through behaviours such as:
Approaching a rival.
Displaying a threat posture.
Raising a particular body structure.
Chasing.
Biting.
Striking.
Clearly defined behavioural categories can make observations more objective and allow researchers to compare responses across animals and conditions.
Studying animals in natural or carefully controlled environments may also preserve behaviour that is relevant to the animal’s normal life.
However, the validity of the findings depends on whether the research setting and stimulus genuinely represent the animal’s ordinary environment.
Limitation: Generalising from Animals to Humans
Much of the support for the ethological explanation comes from animal behaviour.
This creates a problem of generalisability.
Animal aggression may often involve relatively direct functions such as:
Territory.
Food.
Protection.
Competition for mates.
Human aggression may also involve:
Beliefs.
Language.
Social norms.
Moral judgement.
Planned revenge.
Group identity.
Cultural expectations.
Awareness of legal consequences.
A sign stimulus may produce a relatively predictable response in an animal, but humans can interpret a situation and choose among several possible actions.
Animal research can support the existence of basic inherited mechanisms, but it may not provide a complete explanation of human aggression.
Limitation: Human Aggression Is Flexible
Fixed action patterns are supposed to be relatively stereotyped and predictable. Human aggression is often much more variable.
The same provocation could lead one person to:
Walk away.
Make a verbal response.
Ask for help.
Retaliate later.
Respond physically.
Do nothing.
The same person may also react differently on different occasions.
This flexibility suggests that human aggression is affected by cognitive appraisal, learning and social context. It is therefore difficult to describe most human aggression as a fixed action pattern.
Limitation: Learning Also Influences Aggression
The ethological explanation emphasises inherited behaviour, but aggressive responses can also be learned.
People may learn aggression through:
Observing an aggressive model.
Seeing aggression rewarded.
Receiving reinforcement for aggressive behaviour.
Developing expectations about the consequences of aggression.
This challenges the claim that aggression can be understood mainly as an unlearned response.
A more complete explanation may combine inherited vulnerability with learning. For example, a person might have a biological readiness to respond to threats, while experience determines:
Which situations are interpreted as threatening.
Which form of aggression is used.
Whether the response is inhibited.
Whether aggression is seen as acceptable.
This connects the topic to the effects of observed and rewarded aggression.
Limitation: Environmental Cues Do Not Always Produce Aggression
The presence of a possible sign stimulus does not guarantee that a fixed response will occur.
An animal or human may be affected by:
Competing motivations.
Previous experience.
The strength of the cue.
The risk of injury.
The presence of a more powerful rival.
The possibility of escape.
The social consequences of aggression.
This suggests that behaviour is not controlled by a simple automatic mechanism in every situation.
The explanation is stronger when it is presented as identifying a biological tendency rather than an inevitable response.
Strength: Interaction Between Biology and Environment
Although the ethological explanation emphasises innate behaviour, the response still depends on an environmental trigger.
The mechanism contains both:
An inherited neural circuit.
An external sign stimulus.
This means aggression is not explained by biology operating in isolation. The environment activates the biological mechanism.
The explanation can therefore be viewed as a limited interaction between nature and environment:
Innate mechanism + relevant environmental cue → aggressive response
This does not include learning in the same way as social learning theory, but it recognises that the biological response requires an external trigger.
The distinction can be developed through the relative influence of heredity and environment.
Limitation: Biological Determinism
The ethological explanation may be criticised as biologically deterministic.
If aggressive responses are controlled by inherited neural mechanisms, the individual may appear to have little choice over whether aggression occurs.
This can underestimate:
Conscious decision-making.
Self-control.
The ability to learn alternative responses.
Moral responsibility.
Differences between social situations.
The deterministic account may be more convincing for a simple animal response than for planned human aggression.
A less extreme conclusion is that innate mechanisms create a readiness to respond, while cognition and the environment affect whether the response is expressed. This issue links to choice and causal explanations of behaviour.
Limitation: Reductionism
The ethological explanation may also be criticised for reductionism.
It reduces aggression to a sequence involving:
A sign stimulus.
An inherited neural mechanism.
A fixed behavioural response.
This provides a clear and testable account, but it may omit:
Individual interpretation.
Social relationships.
Culture.
Reinforcement.
Group processes.
Conscious goals.
Differences between forms of aggression.
Human aggression is unlikely to be explained fully at one biological level. This connects with levels of explanation in psychology.
Comparing the Ethological and Frustration-Aggression Explanations
The ethological explanation treats aggression as an inherited response triggered by a relevant stimulus. In contrast, aggression following the obstruction of a goal explains aggression as the result of frustration.
Ethological explanation | Frustration-aggression explanation |
Aggression has an innate basis | Aggression follows the experience of frustration |
An IRM is activated by a sign stimulus | A goal is blocked |
A fixed action pattern is released | Aggressive tension or readiness develops |
Draws heavily on animal behaviour | Is applied mainly to human aggression |
Emphasises biological inheritance | Emphasises an emotional response to events |
The comparison shows why different explanations may be more useful for different forms of aggression.
Overall Evaluation
The ethological explanation provides a clear account of how particular environmental cues may activate inherited neural mechanisms and release aggressive behaviour. Evidence from animal behaviour supports the existence of sign stimuli and species-specific responses.
However, applying this explanation to humans is difficult. Human aggression is flexible, shaped by learning and affected by conscious interpretation. Aggressive behaviour does not always follow a fixed sequence, even when similar cues are present.
The most defensible conclusion is that innate releasing mechanisms may help explain basic aggressive tendencies, particularly in animals, but human aggression requires biological, cognitive and social explanations to be considered together.
Hints from the Examiner Reports đź’ˇ
Examiner hint:Â Include the neural basis of an innate releasing mechanism.
In the June 2024 examination, many students correctly explained that an environmental stimulus produces a fixed action pattern. However, fewer students identified the inherited neural system that underpins the process. This prevented many otherwise accurate answers from gaining full marks.
A complete short-answer response should contain three linked ideas:
An IRM is a hard-wired, inherited neural mechanism.
It is activated by an external sign stimulus.
It releases a fixed action pattern.
Distinguish the Mechanism from the Behaviour
Examiner hint:Â Do not use IRM and FAP as if they mean the same thing.
The IRMÂ is the internal neural mechanism.
The FAPÂ is the observable behavioural response.
A useful sentence is:
The sign stimulus activates the inherited IRM, which then releases the aggressive FAP.
Use Precise Specialist Terminology
Examiner hint:Â In a definition question, every technical term should add something useful.
Strong terminology includes:
Hard-wired.
Inherited.
Neural circuit.
External stimulus.
Sign stimulus.
Fixed action pattern.
Avoid vague phrases such as:
“An instinct to fight.”
“Something in the brain.”
“A stimulus makes the animal angry.”
Match the Detail to the Marks
A three-mark question on an IRM needs more than a one-sentence definition.
A useful structure is:
Mark 1:Â inherited neural mechanism.
Mark 2:Â activated by a sign stimulus.
Mark 3:Â releases a fixed action pattern.
The June 2024 mark scheme awarded the highest level of credit to a clear, coherent and elaborated outline that included the neural basis.
Apply Every Stage of the Process
Examiner hint:Â When applying the explanation to an unfamiliar animal, label the cue and the response.
For example:
The bright marking is the sign stimulus. It activates the bird’s inherited neural mechanism, which releases the repeated threat display as a fixed action pattern.
Simply writing that the animal “has an IRM” does not explain how the scenario demonstrates one.
Evaluate the Explanation, Not Just the Research Method
When discussing animal research, explain its consequence for the theory:
Evidence from animals supports the existence of species-specific responses, but human aggression involves cognition and social rules. The findings may therefore have limited generalisability to complex human aggression.
This is stronger than stating only that “animal studies are unethical” or “animals are different”.
Develop Comparisons Directly
Do not describe an alternative explanation in a separate paragraph and assume that this evaluates ethology.
Make the comparison explicit:
Unlike the ethological explanation, social learning theory can explain why the forms of aggression shown by different people reflect the models and rewards present in their environments.
There are no lesson-specific calculations. Where a question provides numerical results, describe the pattern and connect it to the predicted sign stimulus or fixed response.
Common Mistakes ⚠️
Mistake 1
Mistake:Â Defining an IRM as the aggressive behaviour itself.
Why this is incorrect:
An IRM is the inherited neural mechanism. The aggressive behaviour is the fixed action pattern it releases.
How to improve:
Learn the distinction:
IRM = internal mechanism. FAP = observable response.
Mistake 2
Mistake:Â Leaving out the neural basis of the IRM.
Why this is incorrect:
An IRM is not simply an instinct or general tendency. It is a hard-wired network of neural connections.
How to improve:
Begin definitions with:
An innate releasing mechanism is an inherited neural circuit...
Mistake 3
Mistake:Â Saying the sign stimulus teaches the animal how to behave.
Why this is incorrect:
The response is innate. The sign stimulus activates a pre-existing mechanism rather than teaching the response.
How to improve:
Use the verb triggers, activates or releases, not teaches.
Mistake 4
Mistake:Â Calling the sign stimulus an innate releasing mechanism.
Why this is incorrect:
The sign stimulus is external. The IRM is an internal neural mechanism.
How to improve:
Use the sequence:
External sign stimulus → internal IRM → observable FAP
Mistake 5
Mistake:Â Claiming that a fixed action pattern is identical in every tiny detail.
Why this is incorrect:
FAPs are relatively stereotyped, but their expression can still be affected by the context and the animal’s condition.
How to improve:
Describe a FAP as a relatively fixed and species-specific behavioural sequence.
Mistake 6
Mistake:Â Saying all aggressive behaviour is a fixed action pattern.
Why this is incorrect:
Much human aggression is flexible, planned or shaped by learning and social context.
How to improve:
Explain that the ethological account may be more successful for simple, species-typical animal responses than complex human aggression.
Mistake 7
Mistake:Â Confusing ethological and evolutionary explanations.
Why this is incorrect:
Ethology explains the immediate mechanism releasing the behaviour. Evolutionary explanations focus on why the tendency may have been adaptive.
How to improve:
Remember:
Ethology asks how. Evolution asks why.
Mistake 8
Mistake: Evaluating the explanation by writing only “animal studies cannot be generalised”.
Why this is incomplete:
The criticism needs to explain why human aggression may differ.
How to improve:
Refer to cognition, language, culture, social rules and the flexibility of human responses.
Mistake 9
Mistake:Â Assuming innate means the environment is irrelevant.
Why this is incorrect:
The neural mechanism is inherited, but an environmental sign stimulus is usually required to activate it.
How to improve:
Explain the interaction between the inherited mechanism and external trigger.
Mistake 10
Mistake:Â Calling the explanation deterministic without developing the point.
Why this is incomplete:
A label alone does not show why determinism is a problem.
How to improve:
Explain that describing aggression as an automatically released inherited response may underestimate conscious control and responsibility, particularly in humans.
Exam-Style Questions ✍️
Question 1
What is meant by a sign stimulus? [1 mark]
Question 2
Outline two characteristics of a fixed action pattern. [2 marks]
Question 3
Explain how an innate releasing mechanism can lead to an aggressive response. [3 marks]
Question 4
Explain the difference between an innate releasing mechanism and a fixed action pattern. [4 marks]
Question 5
Researchers place different models near the territory of a male fish. The fish ignores most of the models but performs the same aggressive display whenever a model has an orange patch underneath.
Use the ethological explanation to explain the fish’s behaviour. [4 marks]
Question 6
Researchers present three models to 20 male animals from the same species. The table shows how many animals perform a threat display.
Model presented | Animals performing the threat display |
Model with a bright head marking | 18 |
Model with a dull head marking | 5 |
Model with no head marking | 1 |
Describe the pattern in the results and explain how it could support the ethological explanation. [4 marks]
Question 7
Explain one limitation of using animal research to support an ethological explanation of human aggression. [3 marks]
Question 8
Explain one strength and one limitation of the ethological explanation of aggression. [6 marks]
Question 9
Discuss the ethological explanation of aggression. [16 marks]
Answers and Mark Scheme
Question 1
Answer:Â A specific feature of the environment that activates an innate releasing mechanism. [1 mark]
Accept releaser where it is clearly described as an external cue.
Question 2
Award one mark for each relevant characteristic, up to two marks:
It is innate or does not need to be learned.
It is species-specific.
It is relatively stereotyped.
It is triggered by a sign stimulus.
It tends to run to completion once started.
It serves a particular function.
Question 3
Award one mark for each linked point:
An IRM is a hard-wired or inherited neural mechanism.
It is activated by a sign stimulus or external environmental cue.
Its activation releases a fixed action pattern or fixed aggressive response.
Maximum: 3 marks
Question 4
Possible content:
An innate releasing mechanism is an inherited neural circuit.
It exists within the nervous system.
It is activated by a sign stimulus.
A fixed action pattern is the observable behavioural sequence released by the IRM.
The FAP is innate, species-specific and relatively stereotyped.
The IRM is therefore the mechanism, whereas the FAP is the response.
For four marks, the distinction should be clear, accurate and developed.
Question 5
Award up to four marks for clear application:
The orange patch is the sign stimulus.
It activates the fish’s inherited neural circuit or innate releasing mechanism.
The mechanism releases action-specific energy.
The aggressive display is the fixed action pattern.
Performing the same display suggests the response is relatively stereotyped.
Ignoring models without the orange patch indicates that a specific environmental feature releases the response.
Do not award full marks for an answer that merely labels the orange patch without explaining the process.
Question 6
Award up to two marks for describing the pattern:
The model with the bright head marking produces the most threat displays.
Eighteen out of 20 animals respond to the bright marking.
Only five respond to the dull marking.
Only one responds when the marking is absent.
The stronger or clearer the marking, the more frequently the threat display occurs.
Award up to two marks for explanation:
The bright marking may act as the sign stimulus.
It activates an inherited neural mechanism.
The threat display may be a fixed action pattern.
The similar response across many members of the species supports the idea of a species-specific mechanism.
Question 7
Award marks as follows:
One mark:Â Identifies a relevant difference between animal and human aggression.
One mark:Â Explains why this creates a problem of generalisation.
One mark:Â Reaches an appropriate conclusion about the explanation.
Example:
Animal aggression may consist of relatively simple, species-specific responses, whereas human aggression involves thoughts, social norms and conscious decisions. A fixed response observed in animals may therefore not represent complex human aggression. Animal evidence supports basic innate mechanisms but cannot establish a complete explanation of aggression in people.
Question 8
Award up to three marks for one developed strength and up to three marks for one developed limitation.
Possible strength:
The explanation is supported by research showing that a specific stimulus can release an aggressive response. For example, a red or orange feature can trigger an aggressive display in a male stickleback. This supports the proposed link between a sign stimulus, an innate neural mechanism and a fixed action pattern.
Possible limitation:
Human aggression is not usually a fixed behavioural sequence. People can interpret the same provocation differently and may control, delay or change their response. This suggests that cognition and learning influence aggression, limiting the ethological explanation’s application to humans.
Other creditworthy limitations include:
Problems generalising from animals.
Fixed action patterns being less fixed than proposed.
Reductionism.
Biological determinism.
Failure to explain cultural and individual differences.
Evidence that aggression can be learned.
Question 9
A high-level response should contain accurate description and developed evaluation.
Indicative AO1 content:
Ethology as the study of animal behaviour.
Aggression as innate and species-specific.
Innate releasing mechanisms as inherited neural circuits.
Sign stimuli or releasers.
Action-specific energy.
Fixed action patterns.
Characteristics of FAPs.
The sequence from stimulus to aggressive response.
A relevant animal example.
Indicative AO3 content:
Evidence supporting sign stimuli and fixed responses.
Objective investigation of animal behaviour.
Problems generalising from animals to humans.
Human aggression being flexible rather than fixed.
The influence of learning and social context.
Interaction between an inherited mechanism and environmental trigger.
Biological determinism.
Reductionism.
Comparison with social learning or frustration-based explanations.
Distinction between ethological and evolutionary explanations.
Thirteen to sixteen marks:Â Knowledge is accurate and generally detailed. Discussion is thorough, focused and developed. Evidence is used effectively, and specialist terminology is precise.
Nine to twelve marks:Â Knowledge is mostly accurate and discussion is mostly effective. Some points may lack development or focus.
Five to eight marks:Â Some relevant knowledge is present, but the answer is mainly descriptive. Evaluation is limited, generic or only partly relevant.
One to four marks:Â Knowledge is very limited or confused. Discussion is absent, inaccurate or poorly focused.
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