string: This effect has been ascribed to relief from the inhibition of cell firing exerted by endogenous 5-HT at 5-HT1A receptors (Craven et al., 1994; Gartside et al., 1995; Corradetti et al., 1996; Fornal et al., 1996; Mundey et al., 1996), and the variability of responses likely results from different…