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Investigating fMRI Responses: Perceived vs. Actual Color-Motion Combinations

This study explores the neural mechanisms of color and motion perception through fMRI adaptation. Researchers Ryota Kanai and Vincent Walsh aim to identify brain regions selectively responding to perceived combinations of color and motion, which can differ from the actual physical combinations. Using various experimental conditions, including physically alternating and perceptually constant stimuli, we aim to reveal how different areas of the brain respond to physical versus perceptual alterations in color-motion combinations. The findings could enhance our understanding of visual processing.

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Investigating fMRI Responses: Perceived vs. Actual Color-Motion Combinations

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  1. Revealing areas involved in feature binding with fMR adaptation Ryota Kanai & Vincent Walsh Institute of Cognitive Neuroscience and Department of Psychology University College London

  2. Steady-state misbinding of colour and motion Perceived combination of colour and motion can be dissociated from the actual combination

  3. Question: Are there regions selectively responding to perceived combination? Methods: fMR adaptation Condition 1: Physically alternating perceptually constant (in the periphery) Periphery Periphery Center Center Alternate every 2s Condition 2: Physically constant perceptual alternating (in the periphery) Periphery Periphery Center Center Two baseline control conditinos Condition 3: Physically constant perceptually constant (in the periphery) Condition 4: Physically constant perceptual alternating (in the periphery)

  4. Analysis & Prediction We will analyze the responses in the voxles identified by a localizer scan for the peripheral stimuli only. For every subject, we will first conduct a retinotopic scan to isolate early visual areas. 1. Areas responding to physical colour-motion combination will show higher activity in the condition with physical alternation & constant percept. 2. Areas responding to perceptual combination will show higher activity in the condition with perceptual alternation & constant stimulus.

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