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  Thresholds for the identification of the direction of motion of plaid patterns defined by luminance or chromatic contrast

Gegenfurtner, K. (1998). Thresholds for the identification of the direction of motion of plaid patterns defined by luminance or chromatic contrast. Vision Research, 38(6), 881-888. doi:10.1016/S0042-6989(97)00214-9.

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Gegenfurtner, KR1, 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: Contrast thresholds for identification of the direction of motion were determined for sinusoidal gratings and plaid patterns moving in eight possible directions. Since plaid patterns are the sum of two component gratings, a prediction of the thresholds for plaids can be made by assuming that the motions of both component gratings are independently identified (probability summation). In agreement with standard two-stage models of plaid perception, our results show that for stimuli defined by luminance contrast, plaid direction thresholds can be predicted well from the component thresholds. This also holds for fast-moving isoluminant plaid patterns, but for slowly moving (<4 Hz) isoluminant plaids, direction thresholds were substantially higher than the prediction from the components. In the latter case, subjects frequently were unable to identify the motion of the plaid in the pattern direction, even when the direction of motion of both components could be reliably identified. Different mechanisms might underlie the perception of luminance and isoluminant plaids at slow speeds.

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 Dates: 1998-03
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1016/S0042-6989(97)00214-9
BibTex Citekey: 158
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Title: Vision Research
  Other : Vision Res.
Source Genre: Journal
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Publ. Info: Amsterdam : Pergamon
Pages: - Volume / Issue: 38 (6) Sequence Number: - Start / End Page: 881 - 888 Identifier: ISSN: 0042-6989
CoNE: https://pure.mpg.de/cone/journals/resource/954925451842