Applying principles of Learning Theory and the study and measurement of behaviour Flashcards
Reflex
An involuntary response that arises automatically in response to an appropriate stimulus, e.g. salivation at the smell of food
Theory of Classical Conditioning
Aims to account for the way in which reflex behaviour may become associated with a new stimulus that does not naturally activate the behaviour
Unconditioned stimulus (UCS)
- Involuntarily elicits the unconditioned response (UCR)
- E.g. meat or food, hot air out of oven into eye
Unconditioned response (UCR)
- An innate or unlearned response to the UCS
- Usually reflexive and a response of the autonomic nervous system
Conditioned stimulus (CS)
- Starts as a ‘neutral’ event (NS) that does not elicit an UCR
- The CS is then paired with the UCS during the experiment
- E.g. bell / tone, flash of light
Conditioned response (CR)
- A learned response to the CS, which occurs as a result of the UCS and CS being paired
- Resembles the UCR but often is not identical
Process of classical conditioning (before conditioning)
UCS -> UCR
NS -> no response
Process of classical conditioning (during conditioning)
UCS + NS -> UCR
Process of classical conditioning (after conditioning)
CS -> CR
Little Albert experiment
- Watson and Rayner paired a rat (CS) with a loud noise (UCS), which resulted in a startle and fear in little Albert
- This conditioned emotional response was then found to occur when Albert was presented with any other small furry object (generalisation)
Advertising and classical conditioning
- Advertisers will pair a product (initially NS, then CS) with an attractive or popular person, or exciting place (UCS)
- After pairing these together during a campaign, the product may become a conditioned stimulus that evokes pleasant feelings and emotions
Reinforcement
Temporal or spatial pairing of the 2 stimuli (CS and UCS)
Acquisition
- Initial stage of learning
- Usually several pairings of the CS and UCS are needed before CR fully develops
- Proceeds more quickly if intensity of UCS increases, i.e. louder bell / tone
Extinction
- Procedure produces a reduction and eventual disappearance of CR
- Involves repeatedly presenting the CS without the UCS
Spontaneous recovery
- The reappearance of extinguished response after a period of non-exposure
- Extinction does not simply “erase” the previous learning, or permanently “destroy” the CS-UCS pairing
Generalisation
- After classical conditioning with a CS, similar stimuli will elicit the CR
- e.g. different bells may elicit salivation
Discrimination
- The opposite of generalisation
- The subject learns to respond to one stimulus and not to a similar stimulus
- Important in some animals, e.g. impalas learn to discriminate between a hungry wild dog and a full wild dog
Law of effect
States that behaviour resulting in pleasant consequences is likely to be repeated in the same situation
Thorndike and operant conditioning
- Thorndike investigated how voluntary (not reflex) behaviours can be modified by experience (learning)
- Formulated the law of effect
Differentiate operant and classical conditioning
- Classical conditioning focuses on reflexive / involuntary behaviours (largely controlled by the stimuli that precede the response
- Operant conditioning focuses on voluntary / non-reflexive behaviour
Operant conditioning
- A form of learning in which the organism operates on the environment (does not just react to stimuli)
- Learning happens as responses come to be controlled by their consequences
3-term contingency
The operant response is emitted and reinforced in the presence of the discriminative stimulus
Discriminative stimulus Sd : Operant response R -> Reinforcing stimulus Sr
Operant response
According to Skinner, an operant response is a behaviour that operates on its own environment
Discriminative stimulus
- Stimuli that precede an operant response can also influence behaviour
- If behaviour is consistently followed by a reinforcer in the presence of a particular stimulus, then that stimulus can act as a ‘signal’ (that the behaviour is likely to lead to a reinforcer)
Positive reinforcement
- delivers a pleasant stimulus
- response rate increases due to reward
- e.g. rate receives food for pressing a lever
Positive punishment
- delivers unpleasant stimulus
- response rate decreases due to punishment
- e.g. rat received shock for pressing lever
Negative reinforcement
- removal of unpleasant stimulus
- response rate increases to avoid / escape
- e.g. pressing lever serves to avoid / escape shock
Negative punishment
- removal of pleasant stimulus
- response rate decreases due to omission
- e.g. pressing lever produces timeout from food