Chapter 6: Learning Lecture Notes

Learning: Defined as an enduring change in behaviour that results from prior experience.
Nonassociative Learning: A form of learning characterized by a change in the magnitude of an elicited response following the repetition of the eliciting stimulus.
- Habituation: A specific type of nonassociative learning where an organism becomes progressively less responsive to a repeated stimulus.
  - This is described as the brain's version of the ‐cry wolf‐ effect; after multiple instances where a stimulus (the wolf) results in no consequence, the organism eventually ignores it.
  - Mechanisms of habituation may include:
    - Decreased response resulting from muscle fatigue.
    - Decreased ability to detect the stimulus due to the adaptation of sensory receptors.
- Dishabituation: The recovery of a response that has previously undergone habituation. This recovery typically occurs due to the presentation of a novel stimulus.
Associative Learning: A form of learning that involves making mental connections between specific stimuli and behavioural responses. This occurs when a connection or association is established between two events.

Definition: Classical conditioning is a passive form of learning. It involves forming an association between a reflex-eliciting stimulus (such as an electric shock) and other neutral stimuli (such as a sound).
- Through this process, a reflexive action becomes associated with a new stimulus.
The Work of Ivan Pavlov:
- Pavlov utilized an apparatus to measure the salivation of dogs as they consumed food.
- Observation: Pavlov noticed that the dogs did not salivate only when consuming food; they also responded to various other stimuli occurring around the same time food was presented.
- Conclusion: The dogs learned that if a specific condition were met, food would arrive shortly.
Key Components of Classical Conditioning:
- Unconditioned Stimulus (US): A stimulus that naturally and automatically produces a reflexive response without any prior learning.
- Unconditioned Response (UR): The automatic response generated by the unconditioned stimulus.
- Conditioned Stimulus (CS): A stimulus that initially has no positive or negative association but comes to elicit a response after being paired with the unconditioned stimulus.
- Conditioned Response (CR): The response that occurs in the presence of the conditioned stimulus after the association between the CS and US has been learned.

Generalization vs. Specificity: Learning through conditioning can be highly specific to a single stimulus or can generalize to other similar stimuli.
Extinction and Recovery: Learning is not necessarily permanent. Conditioned responses can be extinguished (diminish when the CS is no longer paired with the US), but can undergo spontaneous recovery later under the right situations or stimuli.
The Power of Prediction:
- Timing between events is critical for the brain to learn an association.
- Learning is fundamentally the ability to predict the future based on past experiences, allowing the brain to anticipate stimuli.
Familiarity and Conditioning:
- Conditioning using a familiar stimulus is more difficult than conditioning using an unfamiliar (neutral) stimulus.
- It is easier to establish an association between a CS and a US if they have no previous relationship.

The Little Albert Experiment: Conducted by John Watson and Rosalie Rayner in $1920$ .
- The study demonstrated how an $11$ -month-old infant could be conditioned to fear a white rat.
- Process: They first presented "Albert" with a harmless white rat, which served as the Neutral Stimulus (NS).
- Outcome: Conditioned fear was established, but Watson and Rayner did not eliminate the learning after the experiment was completed.
Counterconditioning: A technique used to counteract undesired associations by conditioning new, opposing responses to those stimuli.
Negative Associations and PTSD:
- Negative associations can be powerful, learned extremely rapidly (sometimes after a single experience), and are easily generalized.
- Post-Traumatic Stress Disorder (PTSD) is an example where individuals may suffer from anxiety for years following a traumatic event.
Neurobiology of Fear: Fear conditioning is dependent on the amygdala, a brain region located next to the hippocampus in the medial temporal lobe.
Positive Associations: Classical conditioning is not limited to fear; associations can also be formed with positive emotional experiences.

Evolutionary Perspective: Human and animal brains are wired to learn certain associations more easily than others. This internal mechanism guides learning toward associations that are adaptive, enhancing survival and reproduction.
Persuasion and Marketing:
- Commercials utilize classical conditioning to generate interest in brands or products.
- Advertisements often employ attractive models or catchy songs (US) to elicit positive feelings (UR/CR) toward the product (CS).
Chronic Drug Use and Conditioned Responses:
- The brain's conditioned response prepares to protect the body by adjusting neurotransmitter levels to counteract a drug's impact.
- Three consequences of this association:
  1. Drug Cravings: Triggered by environmental cues associated with use.
  2. Increased Tolerance: Decreased responsiveness to the drug as the brain anticipates its arrival.
  3. Overdose Risk: If a user takes drugs in a new context, the brain may fail to perform the preparatory compensatory response, leading to a potentially fatal outcome.

Definition: Operant conditioning is an active form of learning where an association is made between a stimulus and a voluntary response (e.g., pressing a button to avoid a shock).
The ABCs of Operant Conditioning:
- Antecedent: The stimulus preceding the behaviour that signals a context where specific behaviours lead to specific consequences (e.g., a green traffic light signals that pressing the gas is appropriate).
- Behaviour: The voluntary action taken by the organism.
- Consequence: The stimulus following the behaviour that determines whether the behaviour will be repeated.

Reinforcement: Any consequence that increases the likelihood of a behaviour being repeated.
- Primary Reinforcer: A consequence that is innately pleasurable or satisfies a biological need (e.g., food, drink, warmth, and sex).
- Secondary Reinforcer: A learned pleasure that acquires value through its association with primary reinforcers (e.g., money used to buy food).
Punishment: Any consequence that decreases the likelihood of a behaviour being repeated.
Effectiveness in Behaviour Modification:
- Punishment may not always be appropriate or productive.
- Evidence suggests children learn more effectively through reinforcement than punishment.
- Spanking in Canada: While not illegal, research (Curatas et al., $2021$ ) indicates it is ineffective and associated with negative developmental consequences.

Imitation: The purposeful copying of a goal-directed behaviour.
Infant Development:
- Meltzoff & Moore ( $1977$ , $1983$ ) suggested that within the first days and weeks of life, infants imitate facial actions such as tongue protrusions and mouth opening.
- Note: There is ongoing scientific debate regarding the replicability of these specific infant imitation results (Davis et al., $2021$ ).