Fig. 10.

Bilateral dialysis into the ventral respiratory column of the triple mixture of excitatory receptor antagonists increased the concentration of 5-HT in the effluent mock cerebral spinal fluid (mCSF) over values when mCSF was dialyzed for 3 h. The 1st bar for each hour is when mCSF was dialyzed all 3 h while the 2nd bar is when the triple mixture was dialyzed during the 2nd hour (closed bar). *During the hour of and the hour after antagonists dialysis, 5-HT was significantly increased above mCSF dialysis.