間欠音と脳波 : 特にα波を中心にして

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This experiment was carried out to investigate the arousal states in the brain by the measurement of the brain waves, especially the alpha-wave (8∼13c/s) appearance under exposure to continuous and intermittent noise.Sixteen healthy men of 20 to 34 years of age were exposed to white noise of 80dB (C) under three different conditions, that is, (1) continuous noise for 10 minutes, (2) regular intermittent noise of one-minute noise and one-minute rest for 19 minute periods, (3) irregular intermittent noise of one-minute noise and irregular rests for 19 minute periods. The duration of the noise exposure in the three conditions each totaled ten minutes.Brain waves were recorded for 10 minutes before exposure to noise, during the noise administration of 10 or 19 minutes and for 10 minutes after the exposure. The changes of alpha-wave appearance between pre- and post-exposure were compared.The results obtained were as follows:1) The appearance of the alpha-wave decreased significantly in the ninth and tenth minutes after exposure to continuous noise.2) Exposure to regular intermittent noise resulted in a significant decrease of the alpha-wave appearance in the latter half of the noise administration.3) Exposure to irregular intermittent noise caused a significant decrease of the alpha-wave appearance after the first half of the noise administration.4) Comparing regular and irregular intermittent noise, the latter brought about a stronger alpha-blocking during the noise administration, while the former showed a delayed restoration in alpha-wave appearance after exposure to noise.These results indicate that the influences of noise as a stressor differ not only by amount of physical energy, but also by regularity of generation.
日本衛生学会の論文

間欠音と脳波 : 特にα波を中心にして

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