Abstract
Reaction times for a simple two-choice shape discrimination requiring either one or both visual cortices were measured.
In a total reaction time of around 400 millisec. the difference found was 3.0 ± 2.6 millisec. If subjects were weighted according to number of observations, and –- 1.34 ± 1.68 millisec. if thery were weighted according to reciprocals of variances of differences of means; that is, it was not significant.