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  Computation times for binocular depth perception. A psychophysical analysis of the "Delayed Stereopsis Illusion" (DSI)

Rosenzweig, R., Schuchardt, M., & Wolf, R. (2002). Computation times for binocular depth perception. A psychophysical analysis of the "Delayed Stereopsis Illusion" (DSI). Poster presented at 25th European Conference on Visual Perception (ECVP 2002), Glasgow, UK.

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Rosenzweig, R1, 2, Author              
Schuchardt, M, Author
Wolf, R, Author
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1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Viewed pseudoscopically, an opaque square floating above a random-dot pattern appears as a rectangular cut-out. When the pattern moves upwards, an illusory gap is perceived at the upper edge of the square. In analogy with Julesz's "no-man's-land" we called this DSI-gap "trailing-edge no-man's-land". Its width, marked by subjects under well-defined conditions, indicates the 3-D computation time needed to determine spatial depth of the pattern, which virtually appears "from nowhere". Early data suggested that in 3-D vision there are two different processing pathways for fast and slow movements (as Gegenfurtner et al, 1996, Trends in Neurosciences 19 394-401 found in normal motion analysis). This could not be confirmed. 3-D computation times rather do not seem to depend on pattern velocity. Our data show interindividual differences and indicate computation times between 50 and 80ms. In any case, the minimum presentation time of 17ms, at which Julesz´ dynamic random-dot-stereograms are just recognizable, is too short to determine the position in depth in each single frame. The vision system rather seems to check that the depth situation has not changed, and maintains the percept of the floating square. Learning, and parameters like spatial frequency, disparity between the square and the moving pattern, and brightness within the range of photopic vision did not significantly influence the perceived width of the DSI-gap. In scotopic vision, however, it was increased in accordance with the Pulfrich effect. (Supported by the Deutsche Forschungsgemeinschaft.)

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 Dates: 2002-08
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 1601
DOI: 10.1177/03010066020310S101
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Title: 25th European Conference on Visual Perception (ECVP 2002)
Place of Event: Glasgow, UK
Start-/End Date: 2002-08-25 - 2002-08-29

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 31 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 160 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369