Effect of bright light on EEG activities and subjective XXXX .

@entity2493 @entity1949 @entity25
The purpose of this study was to investigate the effect of the exposure to bright light on EEG activity and subjective @entity25 at rest and at the mental task during @entity1949 . Eight male subjects lay awake in semi-supine in a reclining seat from 21:00 to 04:30 under the bright (BL; >2500 lux) or the dim (DL; <150 lux) light conditions. During the @entity1949 , the mental task (Stroop color-word conflict test: CWT) was performed each 15 min in one hour. EEG, subjective @entity25 , rectal and mean skin temperatures and urinary @entity2493 concentrations were measured. The subjective @entity25 increased with time of @entity1949 during both rest and CWT under the DL condition. The exposure to bright light delayed for 2 hours the @entity25 at rest and suppressed the increase in that during CWT. The bright light exposure also delayed the increase in the theta and alpha wave activities in EEG at rest. In contrast, the effect of the bright light exposure on the theta and alpha wave activities disappeared by CWT. Additionally, under the BL condition, the entire theta activity during CWT throughout @entity1949 increased significantly from that in a rest condition. Our results suggest that the exposure to bright light throughout @entity1949 influences the subjective @entity25 during the mental task and the EEG activity, as well as the subjective @entity25 at rest. However, the effect of the bright light exposure on the EEG activity at the mental task diminishes throughout @entity1949 .
