ストレスにみる条件情緒反応の精神生理学(ストレスの基礎と臨床)(第27回日本心身医学総会)
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概要
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Psychophysiological analyses of stress by conditioned emotional stimuli were made while Ss watched an inverted T shaped pattern on a CRT display. S_s were told to receive a noxious electric shock at the end of an alternative horizontal period. While spontaneous skin potential responses (SPR) decreased in number during the vertical period, a burst of SPR developed near the end of the horizontal period in a shock anticipation trial. All Ss showed an initial acceleration and followed a deceleration curve in heart rate (HR) during the horizontal period in a shock anticipation period. These results were discussed in relation to. the initial acceleration of sympathetic overactivity (rejection of environment) and secondary acceleration of parasympathetic overactivity (environmental intake) involved in stress. Using the more detail analysis of stress, power spectra of photoelectric finger plethysmogram via Fourier transform were examined. The spectrum below 0.3 H_z was the most prominent at severely variated baseline deflection, and was corresponded to the increasing number of spontaneous SPR and HR under the emotional stress. On the other hand, vertex slow potential change (contingent negative variation, CNV) related to expectancy or attention, and SPR were recorded simultaneously during a constant 2 sec interval between a warning stimulus (pip tone, S_1) and an imperative stimulus (fiash of light, S_2) which they terminated by a motor or mental response (R). When subjects were told to turn off S_2 by a R, both CNV and SPR increased in amplitude. SPR showed diphasic or positive wave dominantly and did not habituate over trials. These results were also interpreted as suggesting the occurrence of stress conditioning during the CNV paradigms. In self obsessivecompulsive state under the repeated stimulation of stress, there was a delay and stability of choice reaction time as compared with rejection of environment and environmental intake. The interpretation of this fact is complex since there exists the possibility of a nonspecific neurofunctional inhibition (improbable as a unique factor), as well as morbid interferences of stress memory and also of adherences to the preceding stimuli (incapacity of commutation) so frequent in an obsessivecompulsive state. These reports support the assumption that bodily responses such as SPR. HR, power spectrum of PTG baseline deflection, CNV, tapping fusion and choice reaction time are likely to be performing a significant role in physiological mechanism correlated with the several stress conditionings.
- 日本心身医学会の論文
- 1987-01-01