Emotions are viewed as having evolved through their adaptive value in dealing with fundamental life-tasks. Each emotion has unique features: signal, physiology, and antecedent events. Each emotion also has characteristics in common with other emotions: rapid onset, short duration, unbidden occurrence, automatic appraisal, and coherence among responses. These shared and unique characteristics are the product of our evolution, and distinguish emotions from other affective phenomena.

In the psychological literature, love is often seen as a construct inseparable from that of close, interpersonal relationships. As a result, it has been often assumed that the same motivational factors underlie both phenomena. This often leads researchers to propose that love does not exist in itself—that it is an emotion which stems solely from a need for attachment, fulfillment of reproductive aims, or for social exchange. The popular cultural imagination, however, perceives love as a unique, mysterious, altruistic, ever-lasting bond (...) between two people—a vision of love which is at odds with its supposed psychological origins. We propose that an ideal of love and its enactment in our culture is a result of two intertwining factors. Within the last few centuries, interpersonal relationships and love have replaced religion as islands of existential comfort. Toward this end, lovers project illusory meaning on their partners. The laborious and turbulent process of withdrawing these projections can lead to what many thinkers think “love” is: bestowal of value on another, and consequent respect for, and care for that person, unmotivated by one's own needs, within the context of a real relationship. (shrink)

In this classic work, often described as "The History of the Rise, Decline, and Fall of the Love Affair," Denis de Rougemont explores the psychology of love from the legend of Tristan and Isolde to Hollywood.