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  Top-down influence of recognition on stereoscopic depth perception

Bülthoff, I., Sinha, P., & Bülthoff, H. (1996). Top-down influence of recognition on stereoscopic depth perception. Poster presented at Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO 1996), Fort Lauderdale, FL, USA.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-EBA6-C Version Permalink: http://hdl.handle.net/21.11116/0000-0005-F33D-5
Genre: Poster

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 Creators:
Bülthoff, I1, 2, Author              
Sinha, P1, 2, Author              
Bülthoff, HH1, 2, Author              
Affiliations:
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: Purpose. Last year we demonstrated that the recognition of biological motion sequences is consistent with a view-based recognition framework. We found that anomalies in the depth structure of 3D objects had an intriguing lack of influence on subject ratings of its figural goodness. In the present work, we attempt to explain this result by showing a strong top-down influence from high-level vision (object recognition) on early vision (stereoscopic depth perception). Methods. We used biological motion sequences of the kind first described by Johansson (Percep. & Psychophysics, 14, 201-211, 1973) to study the perception of 3D structure of human-like versus randomly moving dots displayed in stereo. The depth structure of the human sequence was altered by adding controlled amounts of depth noise (that left the 2D projections largely unchanged). "Random" sequences were created by adding x-y positional noise to the "Human" sequences. In a 2AFC task, participants had to decide whether 3 randomly chosen dots from stereoscopically displayed dot motion sequence appeared at the same distance from the observer. Results. Subject performance was significantly (p < 0.005) better with "random" sequences than with "human" ones. In a human sequence triples drawn from the same limb were often perceived as being in one depth plane irrespective of their actual "distorted" 3D configuration. Conclusions. Those results indicate the existence of top-down object-specific influences that suppress the perception of deviations from the expected 3D structure in a motion sequence. The absence of such an influence for novel structures might account for subjects' better performance with the random sequences.

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 Dates: 1996-02
 Publication Status: Published in print
 Pages: -
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 Identifiers: BibTex Citekey: 566
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Title: Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO 1996)
Place of Event: Fort Lauderdale, FL, USA
Start-/End Date: 1996-04-21 - 1996-04-26

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Title: Investigative Ophthalmology and Visual Science
Source Genre: Journal
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Publ. Info: Hagerstown, MD, etc. : Association for Research in Vision and Ophthalmology, etc.
Pages: - Volume / Issue: 37 (3) Sequence Number: - Start / End Page: S1125 Identifier: ISSN: 0146-0404
CoNE: https://pure.mpg.de/cone/journals/resource/110978984074949