Abstract: Simultaneous color contrast gratings with different spatial frequency were optically generated to examine the spatial property of the simulta- neous color contrast mechanism. Results show that the simultaneous col- or contrast mechanism display low pass spatial frequency characteristics, becoming relatively more effective as the spatial frequency decreases. Th- ese results may provide an experimental support for the suggestion that si- multaneous color contrast mechanism takes part in pattern detection. The color contrast sensitivity functions at different stimulation conditions are also investigated in this experiment.

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