feedback of spontaneous Electro dermal fluctuation in human subjects increased their in frequency of occurrence relative to a non‐contingent feedback control group. The effect was facilitated for subject having high imagery und/or high internal perception as measured by the Suphian Scale of Imagery (SSI) and Sophian Scale of Internal Perception (SSP) respectively. These data suggest the existence of individual differences in self‐control of autonomic responses.

Action of enpiprazole on emotional behavior elicited by hypothalamic stimulation in rats and cats was investigated and comparisons were made with effects of diazepam. Two behavioral patterns were elicited by stimulation of the postero-medial part of the hypothalamus in rats: a food-carrying response beginning with exploratory movement and an analogue of fear. Enpiprazole frequently changed the food-carrying response into food-taking response and occasionally analogues of fear into food-carrying and /or food-taking responses. Thresholds for these behaviors were also elevated. Diazepam showed the same effects on the thresholds as enpiprazole, having but little effect on the behavioral patterns. In cats, enpiprazole evelvated the thresholds for affective-defensive responses induced by hypothalamic stimulation in 6 of 8 cases, but lowered them in 2 cases. This suggests that enpiprazple has a 'biphasic effect' in the central nervous system. By contrast,diazepam consistently elevated thresholds. Comparing the action of enpiprazole with that of diazepam it can be presumed that the former is a different type of anxiolytic drug than the latter.

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