 It motivates the sufferer to cease activities that led to the costly situation, if possible, and it causes him or her to learn to avoid similar circumstances in the future.Proponents of this view tend to focus on low mood, and regard clinical depression as a dysfunctional extreme of low mood—and not as a unique set of characteristics that are physiologically distanced from regular depressed mood.Alongside the absence of pleasure, other noticeable changes include psychomotor retardation, disrupted patterns of sleeping and feeding, a loss of sex drive and motivation—which are all also characteristics of the body's reaction to actual physical pain.