CBSE BoardEnglish MediumSTD 11 HumanitiesPsychologyLearning3 Marks
Question
Distinguish between extinction and spontaneous recovery.
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Answer
Extinction:
Extinction occurs when the CS presented alone without the US for a number of trials, when this is done, the strength or magnitude of the CR gradually decreases.
If the paring of CS (bell) and CR (saliva) is not followed by the US (food) in classical conditioning or lever pressing is not followed by food pellets in the skinner's box, the learned behaviour will gradually become week and disappear.
The key point in experimental extinction is that if motivation is not periodically provided the established responses seems to be extinguished.
Spontaneous Recovery:
Pavlov was of opinion that complete or permanent extinction of a C.R is not possible, when the experimentally extinguished responses reappears again after a period, it is called spontaneous recovery.
e.g. Even without the presentation of food, bell produces a few drop of saliva.
The amount of spontaneous recovery depends on the duration of the time lapsed after the extinction session.
The longer the duration of time lapsed, the greater is the recovery of learned response. Such recovery occurs spontaneously.
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