FIG. 4.

Responses of a B-best neuron that received input from both the anterior and posterior oral cavity. A: response profile obtained using whole-mouth stimulation. This neuron responded quite specifically to bitter stimuli, most vigorously to CHX and DEN. B: poststimulus histograms and single-unit records demonstrating that robust responses to the nonionic bitter tastant, CHX, were elicited when either the nasoincisor ducts (NID) or foliate papillae (FOL) were stimulated. No responses were observed when the anterior tongue or soft palate were tested, either with CHX or the taste mixture (not shown). Stimulus abbreviations as in Fig. 2.