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Long‐term Eyes‐closed Alpha‐enhancement Training: Effects on Alpha Amplitudes and on Experiential State
Author(s) -
Plotkin William B.
Publication year - 1978
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1978.tb01332.x
Subject(s) - alpha (finance) , habituation , psychology , audiology , alpha wave , electroencephalography , sensory deprivation , sensory system , developmental psychology , cognitive psychology , neuroscience , cronbach's alpha , medicine , psychometrics
In order to determine the effects of long‐term alpha‐enhancement training on EEG alpha amplitudes and on experiential states, a 2×2 factorial design was employed with two levels of Sensory Deprivation (high and low) and two of Feedback‐Electrode Placement (O 2 –F 4 and O z –ear). Twelve research participants (3 per cell) engaged in 10 52‐min sessions of eyes‐closed alpha‐enhancement training with proportional auditory feedback of integrated alpha amplitudes. The results led to five major conclusions: 1) even long‐term alpha‐enhancement training (with proportional feedback of alpha strength) does not result in the learned enhancement of alpha strength significantly above optimal eyes‐closed baseline levels; 2) in some cases, alpha‐enhancement training does result in the maintenance of optimal alpha levels; 3) sub‐baseline increases in alpha production during alpha training are most often the result of the gradual dissipation or neutralization of alpha‐inhibitory influences (disinhibition or habituation versus enhancement); 4) the occurrences of unusual experiences during alpha training are partly due to the sensory deprivation conditions of the experimental procedures, and partly due to the effects of suggestion and the experience of success; and 5) alpha feedback from the O 2 –F 4 and O z –ear placements do not have differential effects on EEG alpha or on experiential state.