Learning Flashcards
What is Learning?
relatively permanent change (often in behaviour) which occurs as a result of experience
Define Classical Conditioning and the studies that fall under it
Forming of an association between two stimuli which are not usually considered to be related.
-> Pavlov’s Dog (1902)
-> Little Albert (Watson & Rayner, 1920)
What is the Pavlov’s Dog about and what is the aim?
Aim is to demonstrate the process of classical conditioning through the association of the salivary response with various stimuli
-> Ivan Pavlov noticed that dogs would naturally reflexively salivate when given food but would also salivate in response to other events associated with feeding (Footsteps, The bowl, The assistant who normally fed them (even if the food wasn’t present))
-> The food powder is therefore a stimulus- an object or event that produces a response from an organism
-> Salivation is the response- the reaction to the stimulus
What is the method used in the Pavlov Study?
-> Pavlov created an apparatus capable of holding a dog still while the amount of saliva produced was measured
-> The dogs were observed using a series of mirrors (so to reduce experimenter behaviour affecting that of the dogs)
-> The dogs were initially presented with food powder, and the amount of saliva produced was recorded
-> The presentation of the food powder was then repeated with an unrelated stimulus (e.g., ringing a bell) occurring immediately beforehand
-> After several pairings, the unrelated stimulus was presented without the food powder
-> Numerous variations of the experiment followed
What were the findings of the Pavlov study?
-> The dogs, as expected, salivated when presented with the bell and then the meat powder
->However, they then also salivated when presented with the bell only
-> Thus Pavlov concluded that conditioning has occurred: after multiple presentations, the dogs had associated the unrelated stimulus (the bell) with the food, and produced the same response
What are the results of the Pavlov Dogs Experiment?
-> An unrelated stimulus (bell ringing) did not produce the same response- neutral stimulus (NS)- bell ringing
-> Conditioning- the meat powder (US) and the ringing bell (NS) were presented together many times, producing the salivation response (UR)
->The ringing bell was presented alone, resulting in the dog salivating (dogs salivating became CR and ringing bell became CS)- acquisition
->Pavlov noted that the presentation of the neutral stimulus needed to occur immediately before the unconditioned stimulus (about half a second) for learning to occur effectively (anticipatory behaviour)
-> When pavlov repeated the procedure with (for instance) a buzzer in the place of the bell, he found that conditioned dogs also salivated at that sound also (stimulus generalisation- the tendency for a stimulus which is similar but not identical to the original CS, to generate the same conditioned response)
->If the dogs had not responded to the buzzer but only to the original bell (stimulus discrimination- when the subject responds to the original CS and not to similar stimuli)
-> Generalisation gradient- relationship between the similarity of the stimulus and the strength of the response; usually, the more similar the stronger the response
-> After conditioning has occurred successfully, Pavlov repeatedly presented the bell without providing the meat powder reinforcer afterward
->The dogs eventually ceased salivating in response (extinction- the gradual decrease in the strength or rate of a CR in response to the CS)
-> Spontaneous recovery- reappearance of a CR in response to a CS, following a rest period in which the CR seems to have been extinguished
- For instance, if Pavlov had extinguished the CR in his dogs, and then they spontaneously salivated when presented with the sound of a bell (These responses are usually weaker and shorter-lived than the original)
How does the Pavlov Dog’s study show relevance to Psychology
-> Established the basis for behaviourism and classical conditioning, spurring further work in the field
-> Classical conditioning explains how a number of behaviours are learned and so provides a means to influence or manipulate behaviour- e.g., rewards in education, animal training, advertising
-> Particularly relevant in therapy- e.g., treating phobias, taste aversions etc.
What are the criticisms of Pavlov Dog’s experiment?
-> Pavlov’s experiments are best applied to adaptive behaviours (i.e., those that help survival), such as nausea upon eating poisonous foods
-> The theory presents the learner as too passive; simply pairing stimuli doesn’t result in conditioning - the learner must make a cognitive connection between the stimulus and response
-> Use of animals is criticised - ethical issues around suffering of animals and lack of applicability directly to humans, who are far more cognitively complex
Who presented the Little Albert study and what is the aim?
Watson and Rayner, 1920 that shows classical conditioning occurring in humans
-> Aim: to illustrate and examine classical conditioning in a human child by pairing neutral objects with fear-producing stimuli
What is the Method used in Little Albert
-> Single study subject: 9 month old, ‘stoic’ male child of a hospital worker, Albert Barger (mother gave permission to researchers, but whether consent was truly informed is doubtful)
-> At 9 months, albert was presented with several stimuli (various animals, burning paper, cotton wool, masks), to which he showed no fear reaction
-> At 11 months, Albert was shown one of the animals (a white rat) at the same time that the researchers struck a hammer against a steel bar, making a loud, frightening noise (occurred twice)
-> One week later, the rat was presented to Albert again, and then five more pairings occurred. Each time the response of Albert was recorded
-> Five days later, Albert was again tested with multiple stimuli (rat, rabbit, dog, fur coat, cotton wool, 3 people’s hair, santa claus mask)
-> Five days after that, Albert was subject to further conditioning trials with the rat, and the loud noise was also paired with a dog and a rabbit. He was also exposed to stimuli in a new laboratory
-> One month after that, Albert was again exposed to multiple stimuli (santa claus mask, fur coat, rat, rabbit and dog). At this point Albert’s mother took him out of the hospital
What results were obtained from the Little Albert Study?
-> When Albert was initially presented with stimuli, he showed no fear at all (except when the bar was struck)
-> After two pairings, he began to appear afraid after seven pairings, he was loudly crying and displaying avoidance behaviours (e.g., trying to crawl away)
-> This fear reaction then occurred whether the noise was presented at the same time or not
-> When multiple stimuli were presented, Albert was still very frightened of the rat, dog and a coat, and less so of other stimuli
-> The fear faded as time passed, but was rapidly renewed with reconditioning trials, and with new stimuli introduced, significant generalisation concurred - Albert was reportedly afraid of many stimuli
-> As Albert’s mother left the hospital (and the city) and the researchers were unable to test extinguishing the fears
How did the Little Albert study contribute to Psychology?
-> The study appeared to illustrate that humans could be classically conditioned to develop phobias
-> Additionally, it appeared to illustrated that this conditioning could be generalised to similar stimuli
What were some criticisms of the Little Albert study?
-> Sample size of one (who was notably calm child) and few trials, so clearly not generalizable
-> Possibility of long-lasting psychological harm to child outweighs potential benefits
-> No informed consent from mother - not told process, risk and consequences
-> No debrief (child or mother) and conditioned response was not extinguished
-> Identification of the child (pseudonym, but enough information to narrow it to two possible individuals) breaches confidentiality
What is Operant Conditioning?
A subject operating on the environment (behaving a certain way) to generate a desired consequence (reward)
What are the different studies that fall under Operant Conditioning?
-> Thorndike’s Law of Effect (1898)
-> Skinner Box of Study (1948)
Define reinforcement and punishment and the different types
Reinforcement- consequence (stimuli) which increases likelihood of behaviour
-> Positive reinforcer- addition of something pleasant as a result of the behaviour (Lolly for each complete homework)
-> Negative reinforcer- removal of something unpleasant as a result of the behaviour (Taking away quick quiz for completed homework)
Punishment- is a consequence (stimulus) which causes a certain behaviour to occur less frequently
-> Positive punishment- is the addition of something unpleasant as a result of the behaviour (Detention for incomplete homework)
-> Negative punishment- is the removal of something pleasant as a result of the behaviour (No more blookets on Friday if there is incomplete homework)
what is the 3 phase model under Operant Conditioning?
Antecedent-Behaviour-Consequence Model
-> Antecedent- stimulus that precede a particular behaviour (Puppy is told to ‘sit’)
-> Behaviour- the voluntary action that takes place in the presence of the stimulus (Puppy sits down)
-> Consequence- the environmental event that occurs immediately after the behaviour and affects its occurrence in future (Puppy gets a treat and a cuddle-> more likely to sit in future)
What are the different schedules of reinforcement that Skinner identified under Operant Conditioning?
Fixed Ratio reinforcement- rats fed every time they press the lever a certain number of times (e.g., 5)
-> Response rate (fast)
-> Extinction rate (medium)
Fixed interval reinforcement- rats fed after a fixed time has elapsed (e.g., every 15 minutes)
-> Response rate (medium)
-> Extinction rate (medium)
Variable ratio reinforcement- rats fed unpredictably per number of presses (e.g., first 2 presses, then 15, then 5)
-> Response rate (fast)
-> Extinction rate (slow)
Variable interval reinforcement- rats fed unpredictably per time elapsed (e.g, first 8 minutes, then 1 minute, then 4 minutes)
-> Response rate (fast)
-> Extinction rate (slow)
Who presented the Thorndike’s Law of Effect study, When and what was the aim?
E.L. Thorndike proposed that animals learn response through experiencing consequences for actions (1898)
-> Aim: to observe and empirically test how animals learn
What was the method used in Thorndike’s Law of Effect study?
-> Designed an apparatus known as a ‘puzzle box’, where an animal placed within had to press a lever to escape
-> A food reward was placed outside the box to entice the subject (yay, cats) to escape the box
-> Measured the time taken to press the lever and escape the box on multiple repeated attempts
What were the results obtained in Thorndike’s Law of Effect study?
-> The cats first, attempted ‘trials and error’ method of escape and the first escape occurred by random chance
-> During further trials, the time taken to escape became shorter and shorter, in a gradual and erratic pattern
-> Repeated tests with different puzzle boxes and subjects showed similar results
-> Observed the behaviour of the animals shifts from random to orderly
-> Thus thorndike proposed the Law of Effect: behaviour leading to gratifying response slowly becomes more frequent, or behaviour leading to pleasant consequences is repeated
How did Thorndike’s Law of Effect study contribute to psychology?
-> Puzzle boxes still used today to test animal cognition (and apply results to humans)
-> First to apply psychology to learning, and to introduce the concept of ‘reinforcement’ in learning (not the term, though)
-> The concept of ‘Law of Effect’ drove later research which established operant conditioning
What were the criticisms of Thorndike’s Law of Effect study?
-> Since all the parts of the ‘puzzle’ were not visible to animals, the conclusion that they are not linking cause and effect has been criticised
-> Thorndike’s ideas were further explored by B.F. Skinner, who proposed operant conditioning (1938)- learning a response from operating on the environment
-> He believed that learning had a cognitive component which could be measured by observing behaviour
Why and when was the study the Skinner box published and what was the aim?
‘Superstitious Pigeons’ were readily trained to peck at a target for a food reward
-> Aim: to explore the effects of reinforcement on pigeons when reinforcements are not given depending on the pigeons’ behaviour