Reaction times for 10 Os were measured at 4 photopic intensity levels: 7.13, 8.06, 9.10, and 10.18 log |m|mL., under binocular, dominant eye, and nondominant eye viewing conditions. Reaction time has been found to be a negatively accelerated, decreasing function of increased light intensity. There is a constant relationship between the binocular reaction time and the average monocular reaction time for each O. Equivalent brightnesses under each viewing condition were calculated on the basis of speed of reaction. The resulting curves suggest that binocular reaction times are faster than would be expected from the data of the dominant and the nondominant eye, even assuming complete summation. (23 ref.)

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