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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.

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Official URL: http://dx.doi.org/10.1016/j.concog.2008.05.001

Abstract

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.

Item Type: Article
Keyword(s) / Subject(s): EEG, alpha band, gamma band, hallucinatory color, flicker
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Psychological Sciences
Depositing User: Administrator
Date Deposited: 17 Dec 2010 14:34
Last Modified: 17 Apr 2013 12:19
URI: http://eprints.bbk.ac.uk/id/eprint/2506

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