睡眠発生と慣れの解除 : 末梢血管反応について
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The purpose of this investigation was to determine whether finger plethysmograph response (FPR), previously habituated during pre-sleep wake state, would dishabituate with onset of sleep, and whether restored FPR could rehabituate during sleep. Twelve subjects (22-28 yrs) were divided into two groups: 1) an alert group, subjected to repetitive stimulations during pre-sleep wake and sleep, and 2) a hypnagogic group, subjected to repetitive stimulations after sleep onset. One half subjects in each group received 40db stimulus and the other half 50db. Stimuli were 70, 4-sec, 40db (A) or 50db (A) octave band noises (central frequency 1000Hz), presented at 30-40 sec interstimulus interval. EEG sleep stages were classified according to the criteria of Koga (1960) and Fujisawa (1960). FPR during waking peirod showed faster habituation to 40db stimulus than to 50db. Sleep onset played a trigger role in dishabituating FPR (Fig.5). There was, however, no or little habituation of the restored FPR during sleep (Table 2 and Fig.7). These results were interpreted in terms of Sokolov's neural model. Seeming habituations were often observed during deep sleep (stage 5+6), but those were considered to be due to the decreased responsiveness of FPR in that stage of sleep. Frequency of FPR, although enhanced during sleep, varied with the stage of sleep and was highest during drowsy state (stage 2+3). In addition, the negative transfer effect of prior habituation was found only in stage 2+3, i.e. habituation elaborated during pre-sleep waking period weakened the effect of stimulus intensity and also reduced the percent occurrence of FPR in stage 2+3 (Fig.6). This effect of prior habituation seems to suggest that a memory trace of stimulus information received during waking state may still work in drowsy state.
- 神戸親和女子大学の論文
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- 睡眠発生と慣れの解除 : 末梢血管反応について
- 定位・防御反射の指標としての頭部血管反応 : 刺激強度および覚醒・睡眠段階の効果