Document Detail

Flicker-light induced visual phenomena: Frequency dependence and specificity of whole percepts and percept features.
MedLine Citation:
PMID:  21123084     Owner:  NLM     Status:  In-Data-Review    
Flickering light induces visual hallucinations in human observers. Despite a long history of the phenomenon, little is known about the dependence of flicker-induced subjective impressions on the flicker frequency. We investigate this question using Ganzfeld stimulation and an experimental paradigm combining a continuous frequency scan (1-50Hz) with a focus on re-occurring, whole percepts. On the single-subject level, we find a high degree of frequency stability of percepts. To generalize across subjects, we apply two rating systems, (1) a set of complex percept classes derived from subjects' reports and (2) an enumeration of elementary percept features, and determine distributions of occurrences over flicker frequency. We observe a stronger frequency specificity for complex percept classes than elementary percept features. Comparing the similarity relations among percept categories to those among frequency profiles, we observe that though percepts are preferentially induced by particular frequencies, the frequency does not unambiguously determine the experienced percept.
Carsten Allefeld; Peter Pütz; Kristina Kastner; Jiří Wackermann
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Publication Detail:
Type:  Journal Article     Date:  2010-11-30
Journal Detail:
Title:  Consciousness and cognition     Volume:  20     ISSN:  1090-2376     ISO Abbreviation:  Conscious Cogn     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-10-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9303140     Medline TA:  Conscious Cogn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1344-62     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Department of Empirical and Analytical Psychophysics, Institute for Frontier Areas of Psychology and Mental Health, Wilhelmstraße 3a, 79098 Freiburg, Germany.
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