Fig. 7.

Photomodulation effects across the V1 neuronal population in monkey A. Frequency histogram indicates number of units as a function of modulation magnitude (stimulation rate minus baseline rate; spikes per second) for the entire population recorded at the Lenti-CaMKIIα-C1V1 injection site in monkey A. Eighty-nine of one hundred and thirty-eight units were significantly modulated with light stimulation of 125 mW/mm² irradiance (Wilcoxon rank-sum test, P < 0.05). Units significantly modulated by light stimulation are indicated by black-filled bars. Together, the population of recorded units had a mean modulation magnitude of 30.8 spikes per second (indicated by black arrow).