Fig. 3.

Controls for eye movements during contrast detection. A: the neurometric threshold derived from the 50% best-fixated trials was similar to the threshold derived from all trials. Filled magenta symbols represent P neurons, and open green symbols represent M neurons: circles, monkey 1; inverted triangles, monkey 2; solid line, unity line; 50% best-fixated threshold = all-trial threshold. B: the top 50% of neurons with smaller average eye position deviations had neurometric thresholds that were slightly smaller than those for the rest of the neurons. C: the top 50% of neurons with smaller average eye speeds had neurometric thresholds that were similar to those for the rest of the neurons. D: the neurometric threshold was not significantly correlated with reaction time. Symbols are defined as in A.