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The PIPR effect increases with stimulus intensity. The PIPR effect (black) was obtained by subtracting the blue response from the red response (this order was chosen to provide a positive differential). (a) Sessions 1 and 2 presented stimuli with a retinal irradiance of 12.30 log quanta·cm−2·sec−1 (b). Session 3 used pulses with retinal irradiances of 12.85 log quanta·cm−2·sec−1.
