Instrumental learning.pptx

INSTRUMENTAL CONDITIONING

1. Instrumental learning presenter YATHEESH BHARADWAJ H S chairperson 1 st Mphil psw dr. s.r.Koujalgi Associate professor

2. Content Introduction to Learning Introduction to Instrumental learning or operant conditioning-   Basic assumptions Principles of operant conditioning Experiment and theory- The Free Operant Task Concept of reinforcement Schedules of reinforcement Basic components of Operant Conditioning Token Economy 

3. Learning  “Learning is the acquisition of new behavior or the strengthening or weakening of old behavior as the result of experience .” - smith “A change in human disposition or capability that persists over a period of time and is not simply ascribable to processes of growth.” — From The Conditions of Learning by Robert Gagne

4. Introduction to operant conditioning instrumental conditioning/ instrumental learning  Edward Thorndike proposed a ‘law of effect’, which formed the basis of our modern understanding of operant conditioning . It is referred to as a method of learning involving rewards and punishments for showing the desired behavior . It is a process in which control over the organism’s behaviour is exercised in free environment by judicious application of reinforcement. Therefore, an operant conditioning is a process of learning in which behaviour of organism is emitted rather than elicited one and is strengthened in due course of time through reinforcement.

5. also referred as Skinnerian conditioning Skinner used the term operant to refer to any "active behavior that operates upon the environment to generate consequences“ Skinner is regarded as the father of Operant Conditioning The behavior that is appropriately reinforced tends to be repeated (i.e. strengthened) over a due course of time and the behavior which is not provided with reinforcement will become extinct over the passage of time.

6. Basic assumptions

7. PRINCIPLES OF OPERANT CONDITIONING The 3 Principles of Operant Conditioning include ( i ) the Principle of Reinforcement which further includes positive and negative reinforcement, ( ii) the Principle of Punishment that includes positive and negative punishment, and ( iii) the Principle of Extinction.

8. Skinner evolved his theory of operant conditioning by conducting experiments using animals, which he placed in a “Skinner Box” that was very much similar to Thorndike’s puzzle box

9. His experiment with the Skinner box involved placing an animal (such as a rat or pigeon) into a sealed box with a lever that would release food when pressed. If food was released every time the rat pressed the lever, it would press it more and more because it learnt that by pressing of lever food is given. The pressing of lever in the experiment is described as an operant behavior, because it is an action that results in a consequence. In other words, it operates on the environment and changes it in some way. The release of food as a result of pressing the lever by the rat or pigeon is known as a reinforcer because it increases the frequency of the operant behavior (lever pressing).

10. Skinner identified two key types of behaviors. The first type is respondent behaviors. These are simply actions that occur reflexively without any learning. For Example,  If you touch something hot, you will immediately draw your hand back in response . The second type of behaviors is what Skinner referred to as operant behaviors. He defined these as any and every voluntary behavior that acts upon the environment to create a response .  These are the voluntary behaviors that are under our conscious control. These are also actions that can be learned. The consequences of our actions play an important role in the learning process.

11. Concept of Reinforcement A reinforcer is any event which changes subsequent behaviour when it follows the behaviour in time. As per Skinner’s theory ,  operant conditioning reinforcement refers to the stimulus events that strengthen or increase the rate of behavior occurring before such events or reinforcers . Operant Reinforcement can be of two types:  positive reinforcement  and  negative reinforcement .

12. POSITIVE REINFORCEMENT Operant conditioning positive reinforcement refers to the consequences or stimulus events that result in strengthening or increasing the rate of behavior that precedes them. This means if the consequence of a specific behavior leads to an increase in the occurrence of such behavior in the near future, such a consequence or stimulus event acts as a positive reinforcer . One of the Positive Reinforcement examples maybe you getting reinforced to read more books in the near future as a result of your teacher appreciating your effort in reading books.

13. NEGATIVE REINFORCEMENT Negative Reinforcement in Operant Conditioning refers to the negative reinforcers . These involve the removal of an unfavorable events or outcomes after the display of a behavior. In these situations, a response is strengthened by the removal of something considered unpleasant. In both of these cases of reinforcement, the behavior increases. Physical punishment, discouraging or critical remarks are examples of negative reinforcers . unpleasant consequences reinforce the individual not to exhibit the behavior that resulted in unpleasant consequences . Punishment: - It is the presentation of an aversive stimulus which follows a response and frequently serves to suppress it. The punishment follows the response and decreases the likelihood of the recurrence of response.

14. Schedules of reinforcement This term refers to the particular patterns according to which reinforcers follow responses or are delivered. Intermittent schedule of reinforcement - reinforcement is given only part of the times the animal gives the desired response Continuous reinforcement - reinforcement is given every time the animal gives the desired response . Ratio reinforcement - a pre-determined proportion of responses will be reinforced . 4 . Fixed ratio reinforcement - Reinforcement is given on a regular ratio, such as every fifth time the desired behavior is produced . Variable (random) fixed reinforcement- reinforcement is given for a predetermined proportion of responses, but randomly instead of on a fixed schedule Interval reinforcement- reinforcement is given after a predetermined period of time. Fixed interval reinforcement - reinforcement is given on a regular schedule, such as every five minutes . 8Variable interval reinforcement - reinforcement is given after random amounts of time have passed.

15. Basic components of Operant Conditioning

16. The process of extinction is almost reverse of the process of acquisition of response. Learning of a response is dependent upon the reinforcement. Now in this process when the desired response is emitted there is no presentation of the reinforcement. This is repeated again and again and in due course of time the strength of the desired response starts decreasing and over a period of time it is almost completely diminished. This procedure of eliminating the desired response is called Extinction.

17. Stimulus generalization & discrimination When an organism learns to make the same response to different stimuli within the same class it is known as stimulus generalization. Stimulus discrimination – responds to one stimuli, not to another stimulus

18. Chaining Skinner described chaining as a process in which a series of responses or operants are linked or combined together. For example, in his Skinner box experiment if the rat has to obtain the food he must jump upon a platform, turn a wheel and then press the lever. Thus the three responses must be linked or chained together if the rat in the experiment has to obtain the food. At the level of human beings chaining involves linking long sequence of responses in order to produce the desired behaviour .

19. Token Economy Token economy is a system in which targeted behaviors are reinforced with tokens (secondary reinforcers ) and later exchanged for rewards (primary reinforcers ). Tokens can be in the form of fake money, buttons, poker chips, stickers, etc. While the rewards can range anywhere from snacks to privileges or activities. For example, teachers use token economy at primary school by giving young children stickers to reward good behavior. Token economy has been found to be very effective in  managing psychiatric patients . However, the patients can become over reliant on the tokens, making it difficult for them to adjust to society once they leave prison, hospital, etc .

20. THANK YOU FOR YOUR ATTENTION ANY QUESTIONS?