Figure 1: Average pupillary response to light stimuli 2–11 for 29 subjects. Columns represent separate placebo, dapiprazole, and tropicamide instillations. Conditions are No Task (blue line), Add 1 (green line), and Subtract 7 (red line). Note that the No Task and Add 1 conditions are completely superimposed for the tropicamide administration. Light stimulus duration was from 0 to 1000 msec.