Jack had shown intrinsic interest for pitching a ball.He had been asked to pitch repeatedly and told he would receive a reward for doing so.After pitching to earn the reward, he seemed to discount his earlier, intrinsic motivation for pitching.This phenomenon is known as the:

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The phenomenon described is the over-justification effect, which refers to a decrease in intrinsic motivation to engage in a behavior that was previously enjoyable or rewarding, due to the introduction of external rewards or incentives. In this case, Jack initially had intrinsic motivation for pitching, but the promise of a reward may have caused him to focus more on the extrinsic motivation for pitching, thereby reducing his intrinsic motivation.

Jack Had Shown Intrinsic Interest for Pitching a Ball