Reaction times were obtained to the onset and offset of flash stimuli located in various positions in a visual field divided into two contiguous regions of white and black. With presentation of the flash stimuli in the fovea, there were no significant differences in the character of functional onset and offset RTs or in the character of the function relating RT to distance from the border. There was a border effect operative for both functions; a decrease in both onset and offset RTs appeared as the border was approached from the white side and a slight increase in both onset and offset RTs when the border was approached from the black side.
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