Figure 4.

A, Response magnitude (in spikes per second) to taste stimuli for all units without (abscissa) and after (ordinate) taste prepulses. In each plot, the dotted line indicates the condition in which the response to the stimulus without a prepulse was equal to the response after a taste prepulse. Filled squares, Response without a prepulse versus after an NaCl prepulse; filled triangles, response without a prepulse versus after an HCl prepulse; open diamonds, response without a prepulse versus after a sucrose prepulse; open circles, response without a prepulse versus after a quinine prepulse. B, Left, Response magnitude (in spikes per second) to taste stimuli without taste prepulses (abscissa) versus after a 1 or 5 sec water prepulse. Dotted line indicates the condition in which the response to the stimulus without a prepulse was equal to the response after a water prepulse. Squares, Response to NaCl after a 1 sec (filled) or 5 sec (open) water prepulse; triangles, response to HCl after a 1 sec (filled) or 5 sec (open) water prepulse; diamonds, response to sucrose after a 1 sec (open) or 5 sec (filled) water prepulse; circles, response to quinine after a 1 sec (open) or 5 sec (filled) water prepulse. B, Right, Response magnitude to taste stimuli (without taste prepulses) presented initially (abscissa) and at the end of the experimental protocol (ordinate). Dotted line indicates the condition in which the response to the stimulus initially was equal to the response after the experimental protocol. Filled squares, Response to NaCl; filled triangles, response to HCl; open diamonds, response to sucrose; open circles, response to quinine.