Variations in Alpha Voltage of the Electroencephalogram and Time Perception

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Science  21 Jun 1963:
Vol. 140, Issue 3573, pp. 1307-1309
DOI: 10.1126/science.140.3573.1307


Human subjects were instructed to respond regularly at 3-second intervals while their brain waves were recorded and analyzed. When subjects were alert the time between two successive responses did not vary greatly; however, as subjects became increasingly drowsy these times lengthened and the mean voltage of the peak alpha frequency decreased.