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binoc_riv - brain At what time and spatial scales under...

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Binocular Rivalry COG160/272, Spring 2010 1
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What is Binocular Rivalry? When each eye is shown a different image, percept oscillates between them typically after lengthy exposure to fixed stimuli timescale and spatial extent of rivalry depend on stimulus characteristics 2 2
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What is Binocular Rivalry? Different from bistable percepts such as necker cube or face/vase visual elements “appear/disappear” in binocular rivalry, rather than regroup 3 3
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Why is it interesting? Probe the neural mechanisms and psychophysics of binocular vision: how information from two eyes is combined and suppressed as needed adaptation: static/repetitive information is ignored by the
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Unformatted text preview: brain. At what time and spatial scales? under what conditions? • awareness: visual stimulus is constant, but percept changes. What’s different in the brain? • “consciousness”: if you do not perceive information, is it still represented in your brain? • top-down and attentional inFuences: how does expectation or preference impact perception? 4 4 • Each eye viewed rotating grating of different color • percept oscillates between them • FMRI recordings used to predict current percept • highly accurate at prediction, based on V1 activity Example: FMRI predicts current percept Haynes & Rees, 2005 5...
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