Characteristics of Electroencephalographic Responses Induced by a Pleasant and an Unpleasant Odor
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Accession number;03A0865407
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| Title;Characteristics of Electroencephalographic Responses Induced by a Pleasant and an Unpleasant Odor |
| Author;
KIM Y-K
(Kyushu Univ.)
WATANUKI S
(Kyushu Univ.)
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Journal Title;J Physiol Anthropol Appl Hum Sci
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Journal Code:Y0932A
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ISSN:1345-3475
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VOL.22;NO.6;PAGE.285-291(2003)
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| Figure&Table&Reference;FIG.4, REF.21 |
| Pub. Country;Japan |
| Language;English |
| Abstract;More than sensory stimuli, odorous stimuli were employed to facilitate the evocation of emotional responses in the present study. The odor-stimulated emotion was evaluated by investigating specific features of encephalographic (EEG) responses produced thereof. In this study, the concentrations of the same odor were altered; viz., the changes in odor-induced emotional level were compared with the concurrently monitored EEG response features. In addition, we performed the mental task to evoke the arousal state of the brain and investigated the resemblance of response characteristics of the resting state to the post-mental task resting state. Subjects having no abnormalities in the sense of smell included 12 male undergraduate and graduate students (age range: 22-26 years). Experiment I involved 2 types of odors that induced favorable odorous stimuli (pleasant induction); test-solutions were either diluted 150 (easily perceptible odorous sensation) or 500 (slightly perceptible odorous stimuli) times. Experiment II had 2 types of odors that evoked unfavorable odorous stimuli (unpleasant induction), and test-solutions with dilution rates similar to those of pleasant induction were prepared. Odorless distilled water was used as the control in both experiments. From results of rating the odorous stimuli of our compounds used, the candidates were respectively found to be appropriate in inducing the pleasant and unpleasant smell sensations. The analyses of EEG responses on inducing pleasant and unpleasant smell sensations revealed that the EEG activities of the left frontal region were enhanced. This finding may establish the hypothesis of a relationship prevailing between the positive approach-related emotion evoked by the visual sensation and the left hemisphere (Davidson, 1992; Tomarken et al., 1989). In other words, it can be interpreted that the negative withdrawal-related emotion may be associated with activities of the right hemisphere.... (author abst.) |
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