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Electrophysiological correlates of flicker-induced color hallucinations

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dc.contributor.author Elliott, Mark en
dc.date.accessioned 2011-01-11T15:51:14Z en
dc.date.available 2011-01-11T15:51:14Z en
dc.date.issued 2009-03 en
dc.identifier.citation Becker, C., Gramann, K., Müller, H. J., & Elliott, M. A. (2009). Electrophysiological correlates of flicker-induced color hallucinations. Consciousness and Cognition, 18(1), 266-276. en
dc.identifier.issn 1053-8100 en
dc.identifier.uri http://hdl.handle.net/10379/1528 en
dc.description.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. en
dc.format application/pdf en
dc.language.iso en en
dc.publisher Elsevier en
dc.subject Psychology en
dc.subject EEG en
dc.subject Alpha band en
dc.subject Gamma band en
dc.subject Hallucinatory color en
dc.subject Flicker en
dc.title Electrophysiological correlates of flicker-induced color hallucinations en
dc.type Article en
dc.local.publishedsource http://dx.doi.org/10.1016/j.concog.2008.05.001 en
dc.description.peer-reviewed peer-reviewed en
dc.contributor.funder Deutsche Forschungsgemeinschaft project grant # EL 248/2 en

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