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  Periods of stimulus absence stabilize the perception of ambiguous patterns

Wilke, M., Maier, A., Leopold, D., Ghazanfar, A., & Logothetis, N. (2001). Periods of stimulus absence stabilize the perception of ambiguous patterns. Poster presented at 31st Annual Meeting of the Society for Neuroscience (Neuroscience 2001), San Diego, CA, USA.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-E1D7-E Version Permalink: http://hdl.handle.net/21.11116/0000-0005-AA4E-5
Genre: Poster

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 Creators:
Wilke, M1, 2, Author              
Maier, A1, 2, Author              
Leopold, DA1, 2, Author              
Ghazanfar, AA1, 2, Author              
Logothetis, NK1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: A fundamental property of ambiguous visual patterns is the inevitability of perceptual reversal. The rate of alternation generally depends both upon the physical structure of the stimulus as well as the inherent rate of an individual. Here we present evidence that critical to the reversal process is the prolonged physical presence of the inducing stimulus. We demonstrate that when stimuli are shown only intermittently, the rate of perceptual alternation sharply declines to nearly zero in some subjects. In particular, we found that rotating three-dimensional bistable patterns with mean dominance times less than 10 seconds could be stabilized for periods lasting over ten minutes by correctly adjusting the duration of on and off periods. Since either perceptual state could be maintained in this way, this effect did not simply reflect a perceptual bias on the part of the observer. This trend was also present for other bistable patterns, including those involving geometric depth reversals and apparent motion correspondence. We systematically investigated the influence of stimulus on and off durations on the stability of such patterns, and found that minimizing the duration of the stimulus on time was the predominant factor in perceptual stabilization. We suggest that upon removal of the inducing stimulus a visual memory process retains and holds the last perceptual state, which persists and governs the perceptual interpretation during the subsequent presentation. Electrophysiological studies are currently underway to better elucidate the neural mechanisms contributing to this phenomenon.

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 Dates: 2001-11
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 1198
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Title: 31st Annual Meeting of the Society for Neuroscience (Neuroscience 2001)
Place of Event: San Diego, CA, USA
Start-/End Date: 2001-11-10 - 2001-11-15

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Title: 31st Annual Meeting of the Society for Neuroscience (Neuroscience 2001)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 165.16 Start / End Page: - Identifier: -