Psychologist Robert Plutchik (1927-2006) proposed a psychoevolutionary classification approach for general emotional responses. He considered there to be eight primary emotions: anticipation, anger, disgust, sadness, surprise, fear, trust and joy. Plutchik created the wheel of emotions in order to illustrate the various relationships among the emotions. While Plutchik identifies only eight basic emotions, you can see from the wheel that there are many different degrees, creating a wide spectrum of emotions. Plutchik states that emotions are much more complex than most people realize.