Fig. 13. A summary of extracellular spike amplitude and orthodromic delay for the various classes of neurons. (A) The orthodromic delay of Slow assistance (SA) neurons was significantly different from that of all other classes of neurons. In the inset a solid circle at the intersection of the initials representing each class indicates a significant difference. (B) There were no significant differences in spike amplitude among the Slow assistance (SA) neurons, the Fast assistance (FA) neurons, and the Medium (M) neurons. However, these three classes had significantly different spike amplitudes than the F/O and FR/W classes. There was no significant difference between the F/O and FR/W class neurons.