Journal article

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


Authors listGegenfurtner, KR

Publication year1998

Pages881-888

JournalVision Research

Volume number38

Issue number6

ISSN0042-6989

DOI Linkhttps://doi.org/10.1016/S0042-6989(97)00214-9

PublisherElsevier


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. (C) 1998 Elsevier Science Ltd. All rights reserved.



Citation Styles

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

APA Citation styleGegenfurtner, 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. https://doi.org/10.1016/S0042-6989(97)00214-9


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