Figure 1.

Design. (A) Schematic of gustatory protocol. At the onset of each trial the subject received the taste solution over 3 s. This was followed by a variable wait, a cue to swallow the taste solution, a rinse, and a cue to swallow the rinse. A variable interval followed until the start of the next trial. (B) Schematic of olfactory protocol. At the onset of each trial the subject heard a spoken word, indicating the trial type and then a countdown to sniff. Immediately following the word “sniff” the odor was delivered over 3 s. This was followed by a variable interval until the start of the next trial.