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Normalized inhale volume as a function of odorant valence and identity. Average inhale volume for each participant, normalized by the average volume in the inhales before each trial. (A) Pleasant vs. unpleasant odorants (t17 = 1.946, P = 0.068) and (B) average volume for each odorant, *P < 0.05 (orange vs. asafetida—t = 3.193, Pholm = 0.14; all other ts < 2.21, Pholms > 0.15).
