Fig. 4.

Peristimulus time histograms illustrating the receptive field properties of three cells in STPa. Receptive fields were mapped with a stationary square at nine positions on a 40° × 40° grid. The position of each histogram corresponds to the location of the static square on the screen. The dotted linesrepresent the onset of the square. The square was visible for 1 sec.A, A cell that responded best to the square in the center position of the screen. B, A cell that showed maximal activity for positions around the center but also above-baseline activity for the center position. C, Responses of a cell that showed inhibition to the center position. Bin size for all histograms was 50 msec.