© Daniel S. Weld 1 Reinforcement Learning CSE 573 Ever Feel Like Pavlov’s Poor Dog?
Behaviours not dependent on learning (reflex action, fixed pattern action and behaviours due to...
Transcript of Behaviours not dependent on learning (reflex action, fixed pattern action and behaviours due to...
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Behaviours not dependent on learning (reflex action, fixed pattern action and behaviours due to maturation)
Classical conditioning (Pavlov’s original experiments, conditioned stimulus, unconditioned stimulus, conditioned response, unconditioned response, process of acquisition, extinction, stimulus, generalisation, stimulus discrimination and spontaneous revovery)
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Learning is a relatively permanent change in behaviour as a result of learning
- Can you think of any examples?
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Most human behaviour are learned, but some are innate (inborn), these are:
- Reflex actions- Fixed pattern actions- Maturation
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Kit Kat activity
Actions that are relatively simple and automatic and involuntary
They come directly from the NS
- eg) pulling hand away from hot stove, salivation, blinking
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When different members of the same species produce an identical response to the same specific stimuli
These actions are genetically
programmed into the animal’s NS and appear to be unable to be changed
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Nesting
Salmon migrate thousands of ks through ocean waters to spawn (reproduce) in the rivers in which they were born!
Birds flying south for the winter
Honey bees perform ritualistic behaviours to indicate the location of a source of food
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Development related to physical growth, social, emotional and intellectual development
It occurs in a sequence and is largely predictable – determined by genes (+ a bit of environment)
- eg) learning to walk, learning socially acceptable behaviour, learning how to read
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We learn in different ways and it differs for the individual and the situation
Reinforcement is a key to learning – it refers to any event that increases the chance that the response will occur again
A response is any identifiable behaviour
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Conditioning is a form of learning that emphasises the relationship between a stimulus and a response
- What is a stimulus? Can you think of examples from your everyday lives where a stimulus evokes a certain response
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Classical conditioning: also known as respondent conditioning where we learn by association
Operant conditioning: also known as instrumental conditioning where we learn by consequences
Observational learning: also known as modelling where we learn through observing
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clockwork orange.mp4
pavlovs dogs.mp4
skinner box.mp4
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C:\Program Files\Sniffy Demo For Windows\SniffyDemo.exe
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We will discuss this in more depth later in the AOS
However a token economy is a form of behaviour modification where an individual receives a token (reinforcement) for appropriate behaviour and these tokens can be collected and exchanged for real rewards
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Define the following terms in relation to Classical Conditioning (pg 284-289)
Conditioned stimulusStimulus generalisationStimulus discriminationExtinctionSpontaneous recovery
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Respondent, Pavlovian or Associative Conditioning
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Also known as respondent or Pavlovian conditioning
Conditioning that occurs through repeated association between two or more stimuli
There are several terms we use to describe the events in classical conditioning
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Unconditioned stimulus (UCS) Unconditioned response (CR) Neural stimulus (NS) Conditioned stimulus (CS) Conditioned response (CR) Extinction Spontaneous recovery
Stimulus generalisation Stimulus discrimination
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Before learning a neural stimulus (NS) will NOT evoke a response
After learning the neural stimulus becomes a conditioned stimulus (CS)
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Is a stimulus that is naturally capable of creating a response
EG:- Food- A loud sound- Cold weather - A loud sound- A puff of air on your eye- A hot stove
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Is a naturally occurring (innate) response to an unconditioned stimulus (UCS)
EG:- When you smell food you salivate(food is the UCS salivation is the UCR)
- When it is cold you shiver(cold is the UCS shivering is the UCR)
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Is a stimulus that will evoke a response AFTER learning has taken place
EG:- In Pavlov’s experiment the bell becomes a CS
which triggers salivation (CR)
- You eat every time you go to the kitchen. Food is originally the UCS and feeling hungry is the UCR. In time the kitchen itself becomes the CS and feeling hungry becomes a CR
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A response to a stimulus that has been learned
EG:- Salivating at the sound of the bell
becomes a CR- You get bitten by a spider in your bed
one night. The spider is the UCS, pain is the UCR, your bed becomes the CS and being scared of being bitten becomes the CR
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Often the UCR will become the CR but NOT always
For example with the spider. Pain was the original UCR but then fear of pain becomes the CR
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The period of time it takes for a response or behaviour to be learned
To acquire behaviour a CS must be reinforced during training
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After conditioning has occurred, if the UCS is no longer followed by the CS, conditioning will gradually disappear
EG:- When Pavlov rang the bell (CS) but no
longer presented the food (UCS), the dog eventually stopped salivating (CR) after hearing the bell (UCS)
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When the conditioned response (CR) reappears after a period of time following the conditioned stimulus (CS) spontaneous recovery has occurred
EG:- The next day the experimenter rings
the bell (CS) and the salivation occurs (CR) after it was thought to be extinct
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After conditioning has occurred, other stimulus that appears to be the same (similar) to the conditioned stimulus (CS) may also trigger the conditioned response (CR)
EG:- Pavlov’s dog might salivate at the
sound of a phone ringing or a door bell
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This happens when the person or animal responds ONLY to the conditioned stimulus (CS) and no other similar stimulus
EG:- Pavlov’s dog only salivates at the
sounds of the bell
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With reference to taste aversion
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One trial learning with reference to taste aversion
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Classical conditioning where it only takes one pairing of a neural stimulus prior to unpleasant stimulus to create a lasting association between the two
Most often occurs with pain or food
Time lapse between NS and UCS could be hours – different to classical conditioning where it needs to be immediate
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Sometimes called Garcia response (John Garcia first demonstrated this with animals in 1974) – pg 289 read its interesting
Type of one-trial learning
Association between stimuli (smell or taste) and unpleasant response (vomiting, nausea)
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With reference to Thorndike’s experiments
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Trial and error learning, including Thorndike’s puzzle-box experiment
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Thorndike studied animal intelligence – he placed hungry cat in box with salmon outside box just out of reach and cat had to work out how to press a lever to open the door (puzzle box experiment)
Trial and error learning occurs when an organism eliminates responses that do not achieve desired goals and continue to explore environment until they discover the response that gains the desired reward
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Instrumental or Skinnerian Conditioning
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Operant conditioning, including Skinner’s original experiments (the Skinner box) and processes of acquisition, extinction, stimulus generalisation, stimulus discrimination and spontaneous recovery
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Where we associate a response with a consequence
Behaviours or responses that are reinforced tend to be repeated (Thorndike called this the law of effect)
A response is followed by a reinforcer (food, praise, removal of unpleasant stimuli etc)
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Most operant studies take place in a conditioning chamber (think back to the video on the Skinner box)
Hungry rat (or other animal) is placed in box and receives reinforcement (food) for behaviours such as grooming or pressing a lever (positive reinforcement)
Unpleasant stimuli such as an electric shock may also be removed after the response (negative reinforcement)
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• Positive reinforcement
• Negative reinforcement
• Punishment
• Response cost
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When a pleasant or desirable event follows a response (action/behaviour) and then chances of the response occurring again are increased
EG:- You get $5 for doing the dishes- You get verbal praise for working hard in
class- You get an A+ on an essay your worked
really hard on
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Occurs when an unpleasant stimulus is removed or reduced, increasing the chances of the response occurring again
EG:- You have a headache and take a
panadol - Rat is given shock and shock is
removed if it presses the level
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Any event following a response that will decrease the likelihood of the response occurring again
EG:- Being sent out of class for talking, talking
will become less likely in the future
- Your parents send you to your room without dinner for being naughty, you will be less likely to be naughty in the future
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Another type of punishment (involved in punishment)
Reinforcement where a positive reinforcer is removed after a response
EG:- Parking tickets- Speeding fines- TV privileges
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(Skinner box – operant conditioning) video02.mp4
(Thorndike – trial and error learning – type of operant conditioning) video03.mp4
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In operant conditioning, it is more effective when reinforcement directly follows the desired response (refer to graph on page 300)
If there is a delay in the reinforcement, learning is less likely to occur therefore the chance of the response occurring again will not be increased
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Refers to plans for determining which responses will be reinforced
Continuous reinforcement is when a reinforcer follows every correct response (not realistic under non-lab conditions)
Partial reinforcers do not follow every correct response (extinction is less likely to take place)
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Fixed ratio: number of responses must be made before reinforcement
- EG: I give you a lollie for every 5 minutes you are quiet
Variable ratio: varied number of responses must be made before reinforcement
- EG: playing a poker machine – you don’t know how many dollars you will have to put in to be rewarded
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Fixed interval: reinforcer given after response after a fixed amount of time
- EG: pedestrian button – light will only go green after a fixed amount of time after you press it
Variable interval: reinforcer given after correct response after a varied amount of time
- EG: fishing – you don’t know how long you will have to wait for the fish to bite
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Bobo doll experiment – (observational learning) video01.mp4
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Observational learning (modelling) processes: attention, retention, reproduction, motivation, reinforcement; Bandura’s experiments with observational learning in children
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We learn by observation – but how does it occur?
- Learner pays attention to model- Learner perceives the model to be
interesting- Learner remembers what was done by the
model (retention)- Learner reproduces the behaviour
(reproduction)- Learner has motivation to repeat the task
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Learning set and its influence on future learning
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Is a positive transfer of information from a previous learning situation to a new learning situation
- EG: a driving simulator – a real car- EG: playing tennis – playing
badminton- EG: gymnastics – diving - EG: Sprinting – hurdles
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Comparison of classical and operant conditioning, role of learner, timing of stimulus and response, nature of response (reflex/voluntary)
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Role of learnerTiming of stimulus and responseNature of response
(reflexive/voluntary)
Task:- In your booklets you need to write up
a comparison of classical and operant conditioning
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Ethical issues in conditioning behaviour including Watson’s ‘little Albert’ experiment
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Little Albert experiment
Task:- Read focus on research Little Albert page
298- What are the ethical issues?- Why would this experiment not be
conducted today? There is a section in your booklets for these answers