1The Academic Unit of Psychiatry, University of Bristol, Bristol, UK.
J Psychopharmacol. 2013 Oct;27(10):921-9. doi: 10.1177/0269881113499206. Epub 2013 Aug 7.
Bright light exposure can alter circulating serotonin levels, and alteration of available serotonin by acute selective serotonin reuptake inhibition significantly lowers sweet but not salt taste recognition thresholds. We tested the hypothesis that bright light exposure would increase sweet but not salt taste sensitivity in healthy adults.
Fourteen healthy volunteers were exposed to bright (10,000 lux) and dim (<20 lux) light for 30 min each, in counterbalanced order. Measures of taste perception (salt and sweet) and mood were determined at baseline, and before and after each light exposure period.
Recognition thresholds for sucrose were significantly lower after bright but not dim light exposure. Thresholds for salt were unaffected by either condition. There were no significant changes in taste acuity, intensity or pleasantness for both the taste modalities and on visual analogue scales (VASs) for mood, anxiety, sleepiness and alertness, under either light condition.
Brief bright light exposure reduces sweet but not salt taste recognition thresholds in healthy humans.
亮光照射会改变循环中的血清素水平，而急性选择性血清素再摄取抑制剂对可用血清素的改变会显著降低甜味但不会降低咸味的味觉识别阈值。我们测试了这样一个假设，即亮光照射会增加健康成年人对甜味的敏感度，但不会增加对咸味的敏感度。
14 名健康志愿者分别接受明亮（10000 勒克斯）和昏暗（<20 勒克斯）光线照射 30 分钟，两种光照条件以交替的方式进行。在基线时以及在每次光照暴露前后，测量味觉感知（咸和甜）和情绪的指标。
蔗糖的识别阈值在明亮光照射后显著降低，但在昏暗光照射后没有变化。两种光照条件均不会影响盐的阈值。在两种光照条件下，味觉敏锐度、强度和愉悦度以及情绪、焦虑、困倦和警觉的视觉模拟量表（VAS）都没有明显变化。
短暂的明亮光照射会降低健康人类对甜味的味觉识别阈值，但不会降低对咸味的味觉识别阈值。
