When he was alone, Spencer made several mistakes when playing a very familiar piece on the piano. However, when asked to play the same selection for several of his relatives, Spencer did not make a single error. This difference in Spencer's performance is MOST likely explained by .

social facilitation

Explanation:

Social facilitation is defined as the mechanism in which a person tends to perform better in tasks and activities in presence of certain people rather than performing same task alone.It usually happens because the person is being observed by others .

According to the question , Spencer makes mistakes while playing alone but he can play piano much better in presence of relatives as audience without any mistakes . This explain social facilitation effect.

i'll anser so they can have brainliest (my doubleu key is broken)

answer; interpreting someone's past consistent with present deviance;