Biology · Behaviour, Communication & Social Life
Learning, innate predispositions and behavioural development
An animal responds less to a repeated harmless-looking event but still reacts strongly to a different one. The smaller response could reflect learning, tired muscles, altered sensation or a change in motivation. Naming the process requires more than a declining line.
Nervous Systems, Senses & Movement supplies the sensory and motor context. Evolutionary Processes & Adaptation introduces heritable variation, selection and fitness. Begin with the first lesson and the ordinary numerical examples; return to those chapters when a mechanism or evolutionary comparison needs more detail. Animal Reproduction, Development & Life Histories is an optional return path for reproductive timing and the distinction between resource expenditure and lifetime outcomes.
Back to the Biology mapBy the end, you can
Connect development and experience while distinguishing nonassociative changes, predictive associations and action–outcome learning.
Inherited capacities still develop in a setting
Learning concerns changes associated with experience. A change caused only by maturation, injury or immediate exhaustion is a different explanation. Behavioural performance also depends on opportunity and current state: an animal may have acquired information without expressing the same action on every occasion.
Innate is useful for describing evolved predispositions or capacities that do not require the particular learning experience under discussion. It does not mean that genes bypass development or that an action is independent of all environmental conditions. Learned behaviour uses a developing nervous system; inherited and experiential contributions are not mutually exclusive boxes.
Selected songbird systems illustrate that development can combine a capacity for vocalisation with memory of heard song and later adjustment of production. Species and developmental stages differ. An early experience can have a lasting effect without establishing a universal critical period or a rule that all birds learn in the same way.
Reduced response is not automatically habituation
Habituation is a response decrease associated with repeated stimulation that is not explained by sensory adaptation or motor fatigue. It is called nonassociative learning because the basic question concerns changing response to a repeated event, rather than learning a predictive relation between separate events.
The original record assigns response values 12, 9, 6 and 4 to four successive observations of event A. A separate response to event B is 11, and A is again 4. A later A observation after a gap is 8. The distinction between a response to B and recovery of the response to A matters: responding to something new is not itself recovery of the old response.
Specificity and partial recovery are informative, but one constructed sequence is not a diagnosis or a neural mechanism. General tiredness, changing motivation and differences between events need consideration.
A changing response and two different comparisons
Read the diagram in words
A responses are 12, 9, 6 and 4; B then has value 11 and the next A remains 4. A later A response after a gap is 8. The decline, specificity comparison and partial recovery are distinct descriptions.
| Ordered observation | Original event A / Different event B | Assigned response index | Later observation after a gap |
|---|---|---|---|
| 1 | Original event A | 12 | — |
| 2 | Original event A | 9 | — |
| 3 | Original event A | 6 | — |
| 4 | Original event A | 4 | — |
| 5 | Different event B | 11 | — |
| 6 | Original event A | 4 | — |
| 7 | Original event A | 8 | Later observation after a gap |
Position is observation order, not elapsed time
Original assigned response indices and observation order. No animal, stimulation protocol, equal elapsed intervals, measured mechanism or diagnostic conclusion.
What predicts an event differs from what produces it
In classical conditioning, experience can establish a relation between a predictive event and another event. In instrumental or operant learning, an action's consequences affect behaviour. A setting can also indicate when an action–outcome relation applies. Learning relations is more informative than simply saying that two things happened close together.
The relation diagram keeps event prediction separate from an action-dependent consequence. A light might predict an available resource even when the animal's own action did not make the resource appear. In a different stipulated relation, taking a particular route could determine access. The diagrams are conceptual contrasts, not instructions for training animals.
The occurrence table asks whether event A adds predictive information. In record P, the outcome appears in sixteen of twenty A-present windows and four of twenty A-absent windows. In Q it appears in sixteen of twenty in both. Frequent co-occurrence alone therefore need not make A informative. These assigned records describe environmental relations; neither records an animal's learned response.
Two relationships that learning can concern
Read the diagram in words
In the first panel, one event predicts another, and a separately marked connection concerns a possible learned response. In the second, a setting contextualises an action and its consequence. No animal learning result is supplied.
| Predictive event → Other event or outcome | Environmental predictive relation |
|---|---|
| Predictive event → Possible learned response | Possible acquired performance |
| Setting → Action | Action and consequence in context |
|---|---|
| Action → Consequence | Action and consequence in context |
Environmental relations and demonstrated learning differ
Original conceptual relations, not an animal experiment, evidence of actual learning or a claim of one neural mechanism.
Compare the event with its background
A predictive comparison uses the outcome frequency when A is present and when it is absent, with a denominator for each. A rate difference is useful only for the observation windows defined. Changing window duration or counting many observations from a few individuals can change how a record should be interpreted.
Even a strong environmental association does not show that the animal detected, remembered or used it. To ask about learning, behavioural evidence has to be related to experience while alternatives such as maturation and current motivation remain visible. An observed response and stored information are connected but not identical.
Compare occurrence with and without the event
Read the diagram in words
Record P has 16/20 outcomes with A and 4/20 without A, fractions 0.8 and 0.2. Record Q has 16/20 in both, fractions 0.8 and 0.8. Differences are 0.6 and zero despite the same sixteen co-occurrences.
| Event status | Defined observation windows | Windows containing the outcome | Outcome windows divided by all windows in this row |
|---|---|---|---|
| A present | 20 | 16 | 16/20 = 0.8 |
| A absent | 20 | 4 | 4/20 = 0.2 |
| Defined observation windows | 40 |
|---|---|
| Windows containing the outcome | 20 |
| Present-minus-absent fraction difference | 0.6 |
| Event status | Defined observation windows | Windows containing the outcome | Outcome windows divided by all windows in this row |
|---|---|---|---|
| A present | 20 | 16 | 16/20 = 0.8 |
| A absent | 20 | 16 | 16/20 = 0.8 |
| Defined observation windows | 40 |
|---|---|
| Windows containing the outcome | 32 |
| Present-minus-absent fraction difference | 0 |
A relation in the record is not proof that an animal learned it
Separate constructed forty-window records with equal defined opportunity windows and complete classification. No animal responses, actual learning, independence inference or causal intervention.
Worked example
Same co-occurrence, different predictive information
In P, the supplied outcome fractions are 16/20 = 0.8 with A and 4/20 = 0.2 without A. Their difference is 0.6, or sixty percentage points. In Q, both fractions are 16/20 = 0.8 and the difference is zero.
Both records contain sixteen A-with-outcome windows. Counting that pairing alone makes them look identical, while the background comparison separates them. Q's outcome is common even without A.
In the response-history model, A falls from 12 to 4, a decrease of 8 or two-thirds of the first value. A later value 8 is a partial recovery, not a return to 12. These arithmetic descriptions preserve what was supplied without claiming that the sequence proves a particular learning mechanism.
Check your understanding
Why does a decline in response not by itself prove habituation?
Show reasoning
Fatigue, sensory changes, maturation or motivation can also alter performance. Habituation requires evidence that the experience-related decrement is not explained by sensory adaptation or motor fatigue.
What separates the two associative relation diagrams?
Show reasoning
One relation concerns an event predicting another event; the other concerns an action linked to a consequence in a setting. Prediction, action dependence and observed learning are separate questions.
Why is A uninformative about the outcome in record Q despite sixteen co-occurrences?
Show reasoning
The outcome fraction is 0.8 both with and without A. Its presence adds no predictive difference in the supplied windows, and the table still says nothing about what an animal actually learned.
What to carry forward
Experience, performance, prediction and action consequences need distinct descriptions and evidence.
References
Resources supporting this lesson’s explanations and examples.
- Habituation Revisited: An Updated and Revised Description of the Behavioral Characteristics of Habituation (Neurobiology of Learning and Memory 92(2):135–138, 2009; doi: 10.1016/j.nlm.2008.09.012)Catharine H. Rankin and colleaguesScientific consensus review
- Neural mechanisms of birdsong memory (Nature Reviews Neuroscience 7(5):347–357, 2006; doi: 10.1038/nrn1904)Johan J. Bolhuis and Manfred GahrScientific review
- Associative Relations in Instrumental Learning: The Eighteenth Bartlett Memorial Lecture (The Quarterly Journal of Experimental Psychology Section B 43(1b):1–23, 1991; doi: 10.1080/14640749108401256)Robert A. RescorlaOriginal research lecture
- Biology 2e: Behavioral Biology: Proximate and Ultimate Causes of Behavior (Biology 2e, section 45.7, 2018)Mary Ann Clark, Matthew Douglas and Jung ChoiSelected textbook section