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After random interval (300–500 ms), provided the position of eye had not deviated from the fixation point by more than 0.5 deg, a small dim dot (diameter: 0.17°; luminance: 0.028 cd/m2) appeared on the left or the right at a given eccentricity (7 levels, from 0.5° to 2.3° with steps of 0.3°) and revolved around the fixation at 5.0 radians/sec for 100 msec.
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