Article

Basic Taste Stimuli Elicit Unique Responses in Facial Skin Blood Flow

Graduate School of Human-Environment Studies, Kyushu University, Fukuoka, Japan.
PLoS ONE (Impact Factor: 3.23). 12/2011; 6(12):e28236. DOI: 10.1371/journal.pone.0028236
Source: PubMed

ABSTRACT Facial expression changes characteristically with the emotions induced by basic tastes in humans. We tested the hypothesis that the five basic tastes also elicit unique responses in facial skin blood flow. Facial skin blood flow was measured using laser speckle flowgraphy in 16 healthy subjects before and during the application of basic taste stimuli in the oral cavity for 20 s. The skin blood flow in the eyelid increased in response to sweet and umami taste stimuli, while that in the nose decreased in response to a bitter stimulus. There was a significant correlation between the subjective hedonic scores accompanying these taste stimuli and the above changes in skin blood flow. These results demonstrate that sweet, umami, and bitter tastes induce unique changes in facial skin blood flow that reflect subjective hedonic scores.

Download full-text

Full-text

Available from: Hideaki Kashima, Sep 03, 2015
0 Followers
 · 
118 Views
 · 
46 Downloads
  • Source
    • "We reported previously that basic tastes elicit characteristic responses in the skin blood flow (SkBF) in the face according to the hedonic valence (pleasant or unpleasant) and the taste itself (Kashima and Hayashi 2011). When a bitter taste stimulus was applied in the oral cavity, SkBF in the nose decreased in association with the unpleasantness of the taste, whereas when sweet and umami taste stimuli were applied, SkBF in the eyelid increased in association with the pleasantness of the taste. "
    [Show abstract] [Hide abstract]
    ABSTRACT: To examine whether various types of taste stimuli in the oral cavity elicit unique changes in facial skin blood flow (SkBF) according to the palatability perceived by an individual, the facial SkBF was observed by laser speckle flowgraphy in 15 healthy subjects (11 males and 4 females) before and during the ingestion of bitter tea, chilli sauce, coffee, orange juice, soup, and a water control. The heart rate, mean arterial pressure (MAP), and SkBF in the index finger were recorded continuously. Subjects reported their subjective palatability and taste intensity scores after each stimulus. The vascular conductance indexes (CIs) in the face and finger were calculated as ratios of SkBF to MAP. CI in the eyelid increased significantly in response to chilli sauce, orange juice, and soup, whereas CIs in the forehead, nose, and cheek decreased in response to bitter tea. There was a significant correlation between the palatability scores and CI values in the eyelid when changes induced by chilli sauce were excluded. These results suggest that the facial circulatory response reflects the degree of palatability of a foodstuff.
    Chemical Senses 01/2014; DOI:10.1093/chemse/bjt074 · 3.28 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We have previously reported the unique regional responses of facial skin blood flow (SkBF) to oral application of the basic tastes without simultaneous systemic circulatory changes. In the present study, we determined whether a systemic circulatory challenge due to sympathetic activation induces regional differences in facial SkBF by observing the responses in facial SkBF and blood pressure to a 2-min cold pressor test (CPT) and static handgrip exercise (HG) by right hand in 20 healthy subjects. The CPT significantly increased SkBF in the forehead, eyelid, cheek, upper lip and lower lip by 6 ± 2 to 8 ± 2 % (mean ± SEM) as compared to resting baseline, with a significant simultaneous increase (13 ± 2 %) in mean arterial pressure (MAP), whereas it significantly decreased the SkBF in the nose by 5 ± 2 %. The HG significantly increased SkBF in the forehead, cheek and lower lip by 6 ± 3 to 10 ± 3 %, with a significant simultaneous increase in MAP (13 ± 2 %), while it induced no significant change in the other regions. Increases in SkBF were greater in the right than left cheek during CPT. These results demonstrate that a systemic circulatory challenge via sympathetic activation elicits regional differences in the facial SkBF response.
    Arbeitsphysiologie 10/2012; 113(4). DOI:10.1007/s00421-012-2522-6 · 2.30 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To investigate whether capsaicin and menthol stimuli elicit characteristic responses in facial skin blood flow (SkBF), we observed the facial SkBF response to low and high concentrations of capsaicin and menthol stimuli of 1-ml solution applied to the oral cavity for 20s in 17 healthy subjects. High concentration of capsaicin significantly increased the SkBF in all of the facial areas monitored. High concentration of menthol stimulus significantly decreased SkBF in the nose and increased that in the eyelid, and upper and lower lips. These results demonstrated that capsaicin and menthol stimuli in the oral cavity elicit characteristic responses in facial SkBF.
    Autonomic neuroscience: basic & clinical 12/2012; 174(1-2). DOI:10.1016/j.autneu.2012.11.010 · 1.37 Impact Factor
Show more