Neurobiological relationships between ambient lighting and the XXXX response to acoustic stress in @entity1 .

@entity1 @entity427 @entity272
A study was conducted to determine differences between psychophysiological responses to acoustic stress under different ambient lighting conditions. Typical cool-white indoor lighting was compared to full-spectrum lighting under dim and bright illumination levels. Full-spectrum lighting exhibits spectral characteristics that approximate those found in natural sunlight. The @entity427 response was measured during three preliminary experiments using normal subjects. In the first experiment, one subject was evaluated. Electromyography (EMG) was used to measure eyeblink @entity427 at the obicularis oculi muscle; heart rate (HR) was measured at the wrist; and @entity272 ( @entity272 ) was measured at the left index finger. There was a significant increase in @entity272 ( @entity272 ) and a decrease in heart rate. In the second experiment, @entity272 was used to measure the @entity427 response under cool-white fluorescent lighting versus full-spectrum fluorescent lighting (n = 5 subjects) under both bright and dim lighting conditions. Higher arousal was detected measuring @entity272 under the cool-white lighting condition, and under the dim lighting condition using both types of lighting. In the third experiment, ten subjects were assessed for @entity272 @entity427 response using both lighting types set at the dim brightness level. There was a strong trend indicating a higher @entity272 arousal under the dim cool-white lighting condition. Other studies support that a GABAergic inhibitory circuit is inhibited by darkness and that the spectral characteristics of cool-white lighting are more stressful to @entity1 than full-spectrum lighting. These preliminary findings regarding stress and ambient lighting may be especially important in the neural development of @entity1 , and in those clinical populations that are particularly sensitive to environmental stress.
