“…Perceived Control of Pain The perception of control over aversive stimuli has been demonstrated to be a determinant of the cognitive appraisal of the threat (Corah & Boffa, 1970;Litt, 1988). Studies concerning experimental pain have found that subjects who perceived that their behavior could lead to the reduction or avoidance of an electric shock perceived the stimulus to be less painful (Corah & Boffa, 1970;Glass et al, 1973), and manifested less autonomic reactivity (e.g., lower skin conductance responses) (Geer, Davison, Gatchel, 1970). Pennebaker, Burnam, Schaeffer, and Harper (1977) demonstrated that lack of control was associated with an increased reporting of symptoms.…”