Indeed, our study suggested that habituation was much less pronounced in “dislikers” than in “likers.” In “dislikers,” pleasantness and sniff magnitude seemed to have a tendency to increase with repeated exposure but the effect did not reach significance (Table 1 ), while reverse time-related changes were highly significant in “likers.” It might be that unpleasant odors are more resistant to the effect of familiarization, because maintaining an aversion for potentially harmful stimuli is an adaptive behavior (Delplanque et al., 2008 ; Ferdenzi et al., 2013 ).
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Repeated exposure to odors induces affective habituation of perception and sniffing.
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