Electrophysiological correlates of flicker-induced color hallucinations
Becker, C. and Gramann, K. and Muller, Hermann J. and Elliott, M.A. (2009) Electrophysiological correlates of flicker-induced color hallucinations. Consciousness and Cognition 18 (1), pp. 266-276. ISSN 1053-8100.
In a recent study, Becker and Elliott [Becker, C., & Elliott, M. A. (2006). Flicker induced color and form: Interdependencies and relation to stimulation frequency and phase. Consciousness & Cognition, 15(1), 175–196] described the appearance of subjective experiences of color and form induced by stimulation with intermittent light. While there have been electroencephalographic studies of similar hallucinatory forms, brain activity accompanying the appearance of hallucinatory colors was never measured. Using a priming procedure where observers were required to indicate the presence of one of eight target colors we compared electrophysiological correlates of hallucinatory color with brain states associated with other visual phenomena. Different target colors were accompanied by different patterns of EEG activation. However, in general, we found that the appearance of hallucinatory colors is preceded by a power decrease in the lower alpha band alongside an increase in gamma band frequencies. We argue that decreasing activity in the lower alpha band acts as a gating mechanism, inducing a switch in perception between different colors. The increasing gamma activation may correlate with the formation of a coherent conscious percept.
|Keyword(s) / Subject(s):||EEG, alpha band, gamma band, hallucinatory color, flicker|
|School:||Birkbeck Schools and Departments > School of Science > Psychological Sciences|
|Date Deposited:||17 Dec 2010 14:34|
|Last Modified:||17 Apr 2013 12:19|
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