the reinforcement of a desired behavior on some occasions but not others is called reinforcement. fragmented

The reinforcement of a desired behavior on some occasions but not others is called fragmented reinforcement.

Explanation:

In the field of psychology, reinforcement is referred as the ability of a stimuli to strengthen the response from a person. Fragmented reinforcement is the ability of a person to respond to a stimulus in a controlled manner. This means that the person can control his/her response to a respective stimuli. For example, a person responds to a headache by taking a pill. Next time when he feels a headache, he might consider taking or not taking the pill according to his wish. Such kind of controlled response is fragmented response.

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