Fig. 2.

DRN neuronal activity in rat in vitro slices one day after acute in vivo diazinon exposure. (A) Diazinon exposure increased basal firing rates of DRN neurones (diamonds, individual neurones; circles, mean ± SEM; vehicle n = 23, diazinon n = 20; U = 144.5, P < 0.05). Diazinon exposure did not significantly affect the firing regularity (B) or the mean duration of the three action potential phases (C) of DRN neurones (mean ± SEM). (D) Example of an extracellular recording of a typical action potential from a DRN neurone. The action potential is triphasic (1–3).