The purpose of this study is to identify the physiological characteristics corresponding to four common affects (fear, joy, sadness, and anger). Four films were presented separately to ten university students and their physiological responses were monitored. After the film-presentation, the subjects were asked to rate the films on seven monopolar and three bipolar scales of emotional experience. The physiological responses corresponded with the four types of affect as follows: High diastolic blood pressure (DBP) and heart rate (HR) in the anger situation, low DBP and HR in the joy, medium DBP and HR in the fear and sadness, high respiration rate (RR) in the anger and joy, low RR in the sadness, high frequency of GSR (GSRf) in the fear, and low GSRf in the joy. These affects were also characterized by two functions obtained through discriminant analysis. One discriminant function separated anger from fear; the other set apart joy from the remaining types of affect.