Every point of an image is seen by many overlapping receptive fields. Each one reports how its center differs from its surround. Each preset below runs the same machinery on a different pattern of light.
The stimulus. Click or drag on any panel to choose the recorded cell.
A wide, blurred average of the photoreceptor signal around each point.
Center minus surround. Graded voltage, no spikes. OFF bipolar cells are the mirror image.
Firing rate. A rate cannot fall below zero; the maintained rate is 22 Hz.
Every cell along the dashed row, left to right. The amber line marks the recorded cell.
This cell's response as the spot grows