Figure 4.

Operator between previous and current image, encoded by the instantaneous firing rate during the time of the ON and OFF response, is best described by a subtraction. (A) Example neuron. Different pairs of natural images where used irrespective of whether the image transition elicited ON or OFF responses. The first column shows the average firing rate between 50 and 100 ms after the transition onset. The remaining columns show the average firing rate between 50 and 100 ms after the test image onset (Observe that each test image was preceded by a blank screen). Note the high correlation in the last column. (B) Average correlations across all neurons (n = 320).