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- W2014934617 abstract "Although fragrances have long been known to influence stress-induced psychosomatic disorders, the neurophysiological mechanism remains unclear. We evaluated the effect of fragrance on the relation between the level of sebum secretion in the facial skin and the stress-induced prefrontal cortex (PFC) activity, which regulates the activity of the hypothalamic–pituitary–adrenal axis. Employing near infrared spectroscopy, we measured hemoglobin concentration changes in the bilateral PFC during a mental arithmetic task in normal adults (n = 31), and evaluated asymmetry of the PFC activity in terms of the laterality index (i.e., [(right − left)/(right + left)]) of oxyhemoglobin concentration changes (LI-oxyHb). We measured the level of sebum secretion in the facial skin before the task performance. There was a significant positive correlation between the LI-oxyHb and the level of sebum secretion (r = +0.44, p = 0.01). We selected the subjects who exhibited high levels of sebum secretion and right-dominant PFC activity for the study on the fragrance effect (n = 12). Administration of fragrance for four weeks significantly reduced the level of sebum (p = 0.02) in the fragrance group (n = 6). In addition, the LI-oxyHb decreased significantly from 0.11 ± 0.07 to −0.10 ± 0.18 (p = 0.01), indicating that the dominant side of the stress-induced PFC activity changed from the right to left side. In contrast, neither LI-oxyHb nor the levels of sebum secretion changed significantly in the control group (n = 6). These results suggest that administration of fragrance reduced the level of sebum secretion by modulating the stress-induced PFC activity. The PFC may be involved in the neurophysiological mechanism of fragrance effects on systemic response to mental stress." @default.
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- W2014934617 date "2008-02-01" @default.
- W2014934617 modified "2023-10-02" @default.
- W2014934617 title "Effects of fragrance administration on stress-induced prefrontal cortex activity and sebum secretion in the facial skin" @default.
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- W2014934617 doi "https://doi.org/10.1016/j.neulet.2007.12.014" @default.
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