Fig. 2.

The number of elicited standard spikes is variable across ganglion cell types. The total number of standard spikes elicited by trains of 100, 200, and 300 PPS is plotted as a function of pulse amplitude. Each plot contains the average of all responses from a given cell type: A, BT; B, local edge detector (LED); C, ON-OFF directionally selective (DS); and D, ON DS. Error bars indicate SD. Note that for pulse rates faster than 100 PPS, most types did not generate an action potential in response to each pulse.