刺激によるα波阻止に対するバイオフィードバックの効果

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When some stimuli are given while we are at rest, the stimuli desynchronize the alpha rhythm. We should not be destroyed our mental stability by innumerable stimuli which are not so important for us. As for the repeated stimuli, many experiments on habituation of the arousal reaction have been made (e.g. Sharpless, s., Japer. H.H. 1956). Habituation is based on the learning function in the neurological control system. The aim of this study is to assess the possibility of auditory alpha feedback addition to the habituation to decrease the alpha blocking time. To applicate the feedback training to keep the mental stability in stimulative circumstance is useful for the daily life. This study is constructed with three experiments. In every experiment, we examined the alpha blocking in relaxation and during the feedback training period. Eight healthy students were used as subjects. In Experiment I. we examined the alpha blocking when the same impulse stimuli were given continuously. In Experiment II, we examined the alpha blocking when the different impulse stimuli were given irregularly. And in Experiment III. we examined the mean percetage time alpha changes while discrete stimuli (sampling period 3s) were given. The photo- and phono-stimuli used in our experiments were as follows. photo-stimuli : 40J, 20J, 1J phono-stimuli : sound frequency pure tone(4kHz, 1kHz), white noize. sound pressure 95dB, 50dB From the above three experiments, it is presumed that the auditory alpha feedback can available to decrease the alpha blocking time addition to the habituation in stimulative circumstance. According to the results of the subjective reports after experiments, the strong impulse stimuli, as 40J, 95dB-white noize, gave the subject psychological feeling, e.g. fear, terror, or aversion. In the case of such stimuli are given, it is s supposed that the feedback trainings are more available for us. As Mulholland. T. et al. reported, the effect of the biofeedback training is related to the subject's attention. In this experiment, the percentage time alpha during the feedback training in the circumstance without stimuli was considerably higher than the percentage time alpha in the circumstance with stimuli. When any external stimulus which is no important is given during the feedback training, the subject should prefer the feedback stimulus to the external stimulus. So, during the feedback training period, subject's intention and volition plays an important role in alpha blocinking time decreasing.
日本バイオフィードバック学会の論文
1989-06-03

刺激によるα波阻止に対するバイオフィードバックの効果

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