Detecting the displacement of periodic patterns |
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Authors: | D R Badcock A M Derrington |
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Institution: | Department of Psychology, University of Durham, Durham DH1 3LE, England |
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Abstract: | Observers were asked to detect the direction of displacement of a 30 c/deg grating. They were virtually unable to perform this task when the component was presented alone but when either a 28 or a 32 c/deg component (neither of which moved) was added to the 30 c/deg component observers were extremely sensitive to displacements of the 30 c/deg component. These results suggest that the detection of displacements cannot take place within narrow-band spatial channels, but relies on a mechanism which compares the output of channels in different spatial positions. |
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Keywords: | Spatial frequency analysis Local contrast analysis Spatial beats Spatial localization |
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