Nicolas has autism and he used to be mute.A therapist working with Nicolas initially gave him a piece of chocolate any time he made a sound with his lips.This slowly changed until Nicolas received a piece of chocolate only for saying complete words,and eventually only for saying complete sentences.Which process is illustrated in this example

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The therapist is using shaping to gradually shape Nicolas's behavior (making sounds with his lips) into more complex behavior (saying complete sentences) by reinforcing successive approximations of the target behavior (rewarding him for making sounds, then for saying complete words, and finally for saying complete sentences).

Nicolas Has Autism and He Used to Be Mute