Figure 6

Averaged pre- and post-spike activity of a temperature insensitive VMPO neuron (A) and warm sensitive VMPO neuron (B). For each, averages of 10 action potentials (truncated) during baseline conditions and during perfusion with PGE₂ (1 μM), are superimposed on the spike threshold (post-pike activity during PGE₂ is indicated by an asterisk). These averages do not include pre-spike activity that contained putative postsynaptic potentials. For the temperature insensitive neuron in A, the rate of rise of the depolarizing prepotential increased from 0.17 mV·mSec^-1 to 0.27 mV·mSec^-1. For the warm sensitive neurons in B, the rate of rise of the depolarizing prepotential decreased from 0.38 mV·mSec^-1 to 0.18 mV·mSec^-1.