4 on
3 off
Here are examples of 4 ON cells. Excitation on the left, inhibition on the right. Vertical white lines indicate stimulus ON and OFF. One second duration. Horizontal lines indicate stimulus width: 600 microns.
Here are similar rasters for 3 OFF cells. Note that, except for the LED, excitation and inhibition are complementary in both space and time.
Excitatory and Inhibitory Rasters