Cognitive Health Flashcards
Dawkins’ four ‘memories
Dawkins (2009) refers to four ‘memories’: Genetic (i.e. DNA) Immune system (i.e. antibodies) Nervous system Culture (i.e. word of mouth, books etc)
Associative learning
Learning the associations between events and/or actions Two main types of associative learning: Classical conditioning (aka Pavlovian, Respondent or Type I), where the animal learns associations between external events Operant conditioning (aka Instrumental or Type II), where the animal learns associations between its actions and events
Operant conditioning
Operant response: the behaviour the animal performs that is rewarded (or punished) e.g. lever press
Reinforcement: the action caused by the operant response e.g. door opening to release cat, food reward for rat
Simplest approach is one press results in one reinforcement
This was how Thorndike’s cat puzzle box worked
More elaborate approaches use different ‘schedules of reinforcement’ e.g. more than one response per reinforcement
Positive reinforcement
an increase in the frequency of a behaviour when a positive reinforcer (something pleasant) is presented
Positive punishment
a decrease in the frequency of a behaviour when a positive punisher (something unpleasant) is presented
Negative reinforcement
an increase in the frequency of a behaviour when a negative reinforcer (something unpleasant) is removed (or avoided)
Omission training
a decrease in the frequency of a behaviour when a negative punisher (something pleasant) is removed
behaviourism
n. Psychology the theory that human and animal behaviour can be explained in terms of conditioning
behaviouralism
n. the methods and principles of the scientific study of animal (and human) behaviour
The misbehaviour of organisms
the behaviour of any species cannot be adequately understood, predicted or controlled without knowledge of its instinctive patterns, evolutionary history, and ecological niche
This further contradicted Skinner’s belief in the ‘equivalence of associability’ i.e. that any response would be associated with any reward
In spite of the limitations in operant conditioning highlighted by the Brelands and subsequent studies, operant approaches still form the basis of many of the training techniques we use with animals
Animal training techniques
The emphasis should be on positive reinforcement and omission training
Avoid using positive punishment and negative reinforcement where possible
Learning is going on all the time, not just in a once-a-week training session, so training must be consistent all the time
Need to ensure the training does not become location specific by continuing training in other places
Extinction in terms of behaviour
Extinction is the removal of a behaviour from the animal’s repertoire using omission training (negative punishment) e.g. withholding a reward
Needs to be on a continuous schedule and you must ensure the behaviour is never rewarded
The animal will go through a ‘frustration’ stage until extinction occurs
This frustration often results in what is called an extinction burst
This is when we see a sudden increase in the frequency of an operant response part way through extinction
This is usually followed by the final decline in the behaviour…
…. but this sudden increase in responding can confuse novice trainers as they think it is a sign that extinction is not working
Patience is needed to see the extinction burst through
Extinction or punishment?
Although the frustration associated with extinction is aversive (i.e. it is unpleasant for the animal), it is less aversive than the fear that can be elicited by positive punishment
e.g. trying to stop an unwanted behaviour by hitting or yelling at a dog
For this reason it is better to use extinction (rather than positive punishment) to get rid of unwanted behaviour
variable ratio (VR)
the most resistant to extinction
Example: you are trying to stop a dog begging for food when the family eat at the table
The worst thing is if a family member occasionally ‘gives in’ and gives the dog food
This is then a VR schedule of reinforcement, so the dog will continue to beg, and extinction (stopping begging) will take even longer
continuous reinforcement (or FR1)
the least resistant to extinction
So try putting the begging dog on an FR1 ratio (continuous reinforcement) for a few days
i.e. give it a small treat every time it begs at the table (within reason – some dogs do not seem to experience satiety!)
Then stop completely (and do not give in at all)
The dog should then extinguish (stop begging) quite quickly (at least it should be more quickly than when on a VR schedule)