RESPONSE PROPERTIES OF THE NEURONS IN AREA 17 IN RAT VISUAL CORTEX TO FLASH STIMULI
Tang Jianrong (Department of Life Science, Southwest China Normal University, Chongqing 400715)
Flash evoked responses were extracellularly recorded from 258 neurons in cortical area 17 of 65 male SD rats. The latency of the responses and the cortical layer distribution of the flash responding neurons were analyzed. Seventy seven percent of the observed neurons of cortical area 17 were found to be responsive to flash stimulation on the contralateral eye, the ON, OFF and ON OFF types accounting for 26, 11 and 62%, respectively, of the total. The latency of the light evoked responses ranged mostly from 10 to 120 ms, with the time courses varying from 12 to a few hundred ms. These light responding neurons were mostly located in layers Ⅱ/Ⅲ and Ⅵ, and in layers Ⅳ and Ⅴ. Inhibition of spontaneous discharges by light stimulation was observed in 9 neurons.