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  • Title: Variations in electroencephalographic alpha activity under conditions of differential lighting and auditory feedback.
    Author: Orenstein HB, McWilliams B.
    Journal: Biofeedback Self Regul; 1976 Dec; 1(4):423-32. PubMed ID: 1009189.
    Abstract:
    The electroencephalographic alpha activity of 13 college students was monitored under conditions of darkness or dim light for six sessions, and for a seventh under the opposite condition. Auditory feedback was given for the presence of alpha activity during a 5-min orientation period and when during ten 2-min trial periods. The results indicate that: (1) alpha production in the presence of feedback did not exceed initial eyes-closed base line production; (2) introducing feedback immediately enhances alpha activity, rather than increasing production gradually; (3) under certain circumstances, dim light is sufficient to suppress alpha; and (4) after many sessions of alpha production in darkness, subjects maintain a given amount of alpha even when visual stimulation is present.
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