Invisible motion contributes to simultaneous motion contrast |
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| Authors: | Takahiro Kawabe Yuki Yamada |
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| Affiliation: | 1. Maryland Psychiatric Research Centre, University of Maryland School of Medicine, Baltimore, MD, USA;2. Research Department of Cognitive Neuropsychiatry and Psychiatric Preventive Medicine, LWL University Hospital, Ruhr University Bochum, Germany;3. Department of Psychology, Üsküdar University, Istanbul, Turkey;4. Batman Aile Sa?l??? Merkezi, Batman, Turkey;5. Department of Psychiatry, Celal Bayar University, Manisa, Turkey;1. Bipolar Disorder Program, Institute of Neurosciences, Favaloro University, Buenos Aires, Argentina;2. National Council of Scientific and Technical Research (CONICET), Argentina;3. Institute of Cognitive and Translational Neuroscience (INCyT), INECO Foundation, Favaloro University, Buenos Aires, Argentina |
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| 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 (Experiment 1). Second, we examined whether the observers could correctly respond to the direction of invisible motion: It was impossible (Experiment 2). |
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