Table 1-1 Comparison of Responses to Acute and Chronic Pain Physiologic Response Fight or Flight Includes: increase heart rate increase blood pressure increase pupil size increase muscle tension decrease gut motility decrease superficial capillar Psychological Response Anxiety Includes: feeling tense, irritable, nervous insecure, dread, malaise, jumpy, excited, talkative, apprehensive Autonomic Responses Includes: sleep disturbances Chronic appetite changes decreased libido Pain irritability general withdrawal with weakened relationships increased somatic preoccupation Depression Includes: insomnia, low energy, chronic fatigue, guilt, feeling of inadequacy, productivity decrease, decreased attention, social withdrawal, pessimistic attitude, less talkative, tearfulness (Adapted from Sternbach, 1978) In this study I examined the relationship between personality type theory as described by Jung (1971), coping styles as described by Millon (1973), and pain expression as described by Melzak (1975). Type theory includes an explanation of how one perceives and judges the world. Coping styles include degrees of cooperativeness, sociability, confidence, inhibitions, and sensitivity. Pain expression is the magnitude of perceived pain. All of these variables are explained in depth in the Background of the Study. Acute Pain