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Plant-derived odorants promote good feeling, refresh spirits and sometimes relieve various stresses in humans. Physiological and psychological effects of plant-derived volatile chemicals have long been acknowledged in folk medicine and aromatherapy. Recent evidence from animal experiments suggests that these plant-derived chemicals affect various animal behaviors via modulating neural or humoral mechanisms (Torii et al., 1988; Sano et al., 1998; Ilmberger et al., 2001; Akutsu et al., 2002; Nakashima et al., 2004). However, the majority of those animal experiments were performed under unusual environmental conditions (various stresses, anesthesia). Therefore, we examined the effects of these odorants on sleep– wakefulness and circadian rhythm in freely moving animals. We used two volatile substances: α-pinene and mixture of green odor (nhexenal and n-hexenol).

Effects of Plant-derived Odors on Sleep-Wakefulness and Circadian Rhythmicity in Rats