Schematic representation of the experimental paradigm

Abstract

<p>In the experimental condition (A), a test figure was gradually introduced to one eye to compete with dynamic noise presented to the other eye. The test image was presented from 0, 100, 200, 300 or 400 ms after the trial began, with its contrast linearly ramped up from 0 to 100% within a period of 1 s, and then remained constant until the observer made a response to indicate on which side something other than noise appeared. In the control condition (B), a test image was presented directly on the noise background with its contrast increased gradually at a slower rate than in the experimental condition. Observers viewed the stimulus binocularly and responded to the appearance of the test image as soon as possible.</p