Exploring human brain activities involved in the hedonic-evaluating process of odors
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概要
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There are several studies showing the hedonics of odor affects human brain responses. In preceding studies, however, the hedonics of odor was decided by experimenters'settings, not by participants'own ratings. This might be one reason of disagreement of activated brain areas among preceding studies. Thus, in this study, the odor stimulations were grouped into one of three conditions, pleasant, neutral and unpleasant conditions, based on participants'own ratings, and then brain responses revealed by fMRI were analyzed and compared based on these conditions. Activation was clearly detected in the insula and the cingulate cortex during odor stimulations that participants evaluated as unpleasant, and in the cingulate cortex during odor stimulation that the participants evaluated as pleasant. It is suggested that the inconsistency of activated brain areas in previous studies may have been caused by individual differences in the evaluation of odor hedonics.
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