THE INFLUENCE OF TASTE STIMULUS AND ILLUMINATION ON THE ELECTROGASTROGRAM OF JAPANESE AND CHINESE

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  • 日本人と中国人の胃電図に及ぼす味覚刺激と照明の影響

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Abstract

The present study was conducted to investigate the influence of different lighting condition and taste stimulus on the autonomic nervous system measured by electrogastrogram (EGG). We conducted the experiment for 16-conditions (4 lighting conditions×4 taste solutions). The four lighting conditions were 200 and 1500 lx in illuminance and by 3000 and 7500K in color temperature. The four taste solutions were sweet (glucose), salty (salt), sour (acetic acid), and bitter (quinine). The subjects were healthy seven Japanese and six Chinese males. The changes of EGG normal wave ratio (EGG-NR; 2〜4.5 cpm power/1〜10 cpm power) after stimulation were compared among taste conditions. As a result, the main effect of taste was significant. EGG-NR of the sweet and the salty taste were higher than the bitter taste. Then separate analyses were conducted for Japanese and Chinese. EGG-NR for the sweet taste and the salty taste were higher than the bitter one in Japanese, but there were no difference in Chinese. We also compared EGG-NR in different lighting conditions, the main effect of color temperature was significant, but not in the illuminance. EGG-NR increased significantly in the lower color temperature.

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