from Section III - Emotion Perception and Elicitation
Published online by Cambridge University Press: 16 September 2025
The connection between olfaction and emotions has been established across many subjects. Considering the anatomy of the olfactory system, the canonical targets of olfactory projection neurons are part of and associated with nonolfactory neural circuits, widely summarized as the limbic system. Presumably, partly due to this strong connection between olfaction and the limbic system, odors can directly evoke emotions and result in emotional autobiographical memories. Accordingly, odors have been used to modify emotions via nocturnal exposure, active inhalation, and olfactory training. Odor pleasantness impacts these beneficial effects. The valence of odors changes resting state functional connectivity in regions associated with emotions, memory, motivation, and action control. Considering all the above, olfactory loss negatively influences human behaviors in various life domains, including ingestion, hazard avoidance, and social communication, often resulting in a reduced quality of life and well-being, which in turn may be associated with depressive disorders.
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