THE OCCIPITAL ALPHA RHYTHM: A STUDY OF PHASE VARIATIONS

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Abstract
The "phase" variation of the occipital output in human brains was studied by 2 precision methods: (1) the superposition of output signals from 2 channels of a Grass electroencephalo-graph through an electric switch; and (2) by means of a triple gun oscillograph (Electronic Tube Corporation, Philadelphia). The results obtained indicate that there are 4 effectively independent potential difference generators in the occipital region. The potential fields are oriented with maximum negativity around the calcarine fissure. The major orientation of these potential fields is similar to that observed by Adrian and Yamagiwa. However, the apparent phase changes observed in many instances are the result of small differences in frequency of the major oscillators, with consequent fluctuation in peaking period. The frequency regulation of any pericalcarine oscillator fluctuates around a mean value. The location of the major potential control generators as detd. electrically is remarkably similar to the location of the geometrically projected calcarine cortex on the surface of the head.

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