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Mean ± SEM response rates (in spikes per second) to taste stimuli presented alone or when a taste prepulse preceded the stimulus by 1 sec. Large letters along abscissa indicate stimulus presentation without a prepulse. Smaller letters along abscissa indicate the stimulus used as a prepulse. S, Sucrose; N, NaCl; H, HCl; Q, quinine. *p < 0.05; **p < 0.01. For details of statistical analyses, see Results.
