Journal
JOURNAL OF PHYSIOLOGICAL SCIENCES
Volume 69, Issue 4, Pages 613-621Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s12576-019-00674-9
Keywords
Electroencephalogram; Fast Fourier Transform analysis; Smell; Taste; Theta
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22590966]
- Research Clusters Program of Tokushima University
- Grants-in-Aid for Scientific Research [22590966] Funding Source: KAKEN
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The aim of this study was to investigate how odor stimulation affects taste perception. Electroencephalogram (EEG) signals were measured from the frontal region of the head in normal, healthy subjects, and frequency analyses were performed. Each odor stimulation was delivered while the subject was tasting chocolate, using chocolate paste as the odorant for 'matched odor stimulation,' and garlic paste for 'unmatched odor stimulation.' Differences in EEG signals appeared between the matched and unmatched arms of the study. Comparison of the frequencies of EEGs captured under the condition of unmatched odor stimulation with those captured under the condition of matched odor stimulation showed that the occupancy rate of the theta-frequency band under the condition of unmatched odor stimulation was higher than that under the condition of matched odor stimulation. Interestingly, a negative correlation existed between the occupancy rate of the theta-frequency band and the subjective feeling of chocolate sweetness. The present findings suggest that when humans receive odors that do not match with the foods being consumed, subjective feelings are disturbed and theta-band brain activity is increased while the unmatched information is cross-checked.
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