According to drive-reduction theory, a refers to a physiological state that usually triggers motivational arousal.

According to drive-reduction theory, a "NEED" refers to a physiological state that usually triggers motivational arousal.

Explanation:

The drive reduction theory states that organisms are born with certain biological needs (such as hunger, and thirst). These "needs" sometimes trigger a state of arousal known as "drive".

It is the drive that motivates the organism to act externally, in a certain way.

When these needs are not met, a state of negative tension is created, however, satisfying these needs returns the organism to a relaxed state.

answer: musical connotation

leonard b. meyer (1918-2007) was an american composer, author and philosopher. his work emotion and meaning in music is perhaps the first major treatise on music. it is a philosophical and psychological work, greatly influenced by koffka (one of the major proponents of gestalt psychology). his work deals with the problem of musical meaning and musical communication.