Discrimination following adapation to radial motion N Nikolova, M Morgan |
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Visual Perception Group, Max-Planck-Institute Neurological Research, Germany
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| Motion adaptation is known to affect the perception of moving dot stimuli. We measured motion coherence thresholds as a function of the pedestal signal for radially-moving dot fields. The observer decided, in a spatial 2AFC task, which of two hemi-fields contained the greater amount of coherent motion. We measured the unadapted coherence thresholds for contraction and expansion, and those following adaptation to either contraction or expansion. Adaptation to radial motion clearly increased detection thresholds. Interestingly, increasing pedestal coherence did not result in a masking region, as is often observed in functions of discrimination. We discuss possible explanations and models. |
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