Invisible motion contributes to simultaneous motion contrast

Consciousness and Cognition 18 (1):168-175 (2009)

Abstract
The purpose of the present study was two-fold. First we examined whether visible motion appearance was altered by the spatial interaction between invisible and visible motion. We addressed this issue by means of simultaneous motion contrast, in which a horizontal test grating with a counterphase luminance modulation was seen to have the opposite motion direction to a peripheral inducer grating with unidirectional upward or downward motion. Using a mirror stereoscope, observers viewed the inducer and test gratings with one eye, and continuous flashes of colorful squares forming an annulus shape with the other eye. The continuous flashes rendered the inducer subjectively invisible. The observers’ task was to report whether the test grating moved upward or downward. Consequently, simultaneous motion contrast was observed even when the inducer was invisible . Second, we examined whether the observers could correctly respond to the direction of invisible motion: It was impossible
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DOI 10.1016/j.concog.2008.12.004
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Strength of Early Visual Adaptation Depends on Visual Awareness.Randolph Blake, Duje Tadin, Kenith V. Sobel, Tony A. Raissian & Sang Chul Chong - 2006 - Pnas Proceedings of the National Academy of Sciences of the United States of America 103 (12):4783-4788.

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