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- W193959969 abstract "Our understanding of human visual perception generally rests on the assumption that conscious visual states represent, in some qualitative fashion, a complex interaction between spatially structured variations in the ambient optic array and our visual nervous systems. The existence of visual hallucinations in a number of pathologies (e. g. Kolmel, 1984) as well as in experimental contexts (Fechner, 1838; Benham, 1895; Herrmann & Elliott, 2001; Knoll & Kugler, 1959) questions the assumption that what we see in the environment is necessarily determined by spatial structure in the distal stimulus. Here we show that complex colour and form hallucinations are evoked by flickering light and that the type of hallucination varies with flicker frequency flicker phase and the occurrence of other flicker induced hallucinations. This evidence supports theories of consciousness that stress temporal aspects of perceptual processing. Contemporary perspectives hold conscious experience as an emergent property arising from synchronous oscillations at widely dispersed brain areas (Tononi & Edelman, 2002). Nevertheless, the question of whether or not the mechanisms responsible for conscious content depend upon precise temporal coding remains a problem of considerable complexity. It has been shown that an hallucinatory experience of visual percepts might be brought about through electrical stimulation (Knoll & Kugler, 1959) or by means of photic driving, that is as a function of exposure to high frequency flicker (Eichmeier & Hofer, 1974; Herrmann & Elliott, 2001). A hallucinatory experience involves the perception of an external object or event in the absence of object-related information in the ambient optic array. Pure visual hallucinations are thus conscious states that appear to occur solely as a function of our visual nervous systems and with no obvious spatial reference in the visual world. If hallucinatory experience can arise solely as a function of intermittent stimulation, the possibility to describe conscious visual states exclusively in terms of variations in the temporal patterning of stimulation seemed highly promising." @default.
- W193959969 created "2016-06-24" @default.
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- W193959969 date "2004-01-01" @default.
- W193959969 modified "2023-09-27" @default.
- W193959969 title "The visual hallucinatory response to flickering polychromatic light." @default.
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