Krissy's father has withheld the consequence (purchasing a toy) that usually follows her behavior (shopping with her father). On the trip home, Krissy, who never did get a toy, sat silently and stared out the window. This is not surprising, because extinction is sometimes followed by a temporary period of .

Depression

Explanation: When individuals show exhibit reduction in level of enthusiasm, morale or their usual level of desire due to psychological, emotional or mental issues. Depression is usually associated with extinction which occurs when a conditioned behavior which usually reaps reinforcement or reward in the past is gradually and repeatedly overlooked and left unrewarded. A depressed individual usually exhibit lack of interest in activities which is observed in krissy's behavior as she sat alone I mlow spirit after her father had decided not to reward a behavior which has almost always reaped reward in the past.

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