This study measured onset and offset reaction time (RT) to test stimuli presented in a surround and no-surround condition in the fovea. The differences between onset and offset RT in the surround condition were not significant. However, the differences between onset and offset RT for the no-surround case and the differences between surround and no-surround RTs were significant. RTs were faster with a surround present. A significant luminance by onset-offset interaction for the surround condition was also present.
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