Effects of daytime light exposure on cognitive brain activity as measured by the ERP P300
Effects of daytime light exposure on cognitive brain activity as measured by the ERP P300
复制标题
通过 ERP P300 测量白天光照对认知大脑活动的影响
DOI：
10.1016/j.physbeh.2014.10.013
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发表时间：
2015
影响因子：
2.9
通讯作者：
Seiji Nakagawa
中科院分区：
文献类型：
--
作者：
Yosuke Okamoto;Seiji Nakagawa
暴露在阳光下不仅可以调节人类的警觉性，还可以调节认知功能。这项研究考察了光暴露对与认知过程相关的皮质活动的影响的时间动力学。当参与者在暴露于短、中或长波长的光或黑暗中执行一项奇怪的听觉任务时，测量了事件相关电位(ERPs)。实验是在白天进行的。经过10分钟的黑暗后，三盏灯中的一盏亮起28分钟。在对照条件下，整个过程保持黑暗。分析目标刺激(P300)开始后观察到的大约300ms的ERP成分。短波长光照射5~20min后，P300的波幅大于黑暗中相同时点的波幅。P300波幅在中、长波光照条件下与黑暗条件下各时间点均无差异。这些结果表明，白天暴露在短波长光下，分配给古怪任务的注意资源量增加，并且在暴露大约5分钟后，能够检测到光对与认知过程相关的皮质活动的影响。
Exposure to light modulates not only human alertness but also cognitive functions. The present study examined the temporal dynamics of the effects of light exposure on cortical activity related to cognitive processes. Event-related potentials (ERPs) were measured while participants performed an auditory oddball task during exposure to short-, medium- or long-wavelength light or darkness. Experiments were conducted in the daytime. After a 10-min period of darkness, one of the three lights was presented for 28 min. In the control condition, darkness was maintained for the entire session. The ERP component observed approximately 300 ms after the onset of the target stimulus (P300) was analyzed. The amplitude of P300 was larger after 5–20 min of exposure to short-wavelength light than at equivalent time points in the darkness. No differences were observed in the amplitude of P300 between the medium- or long-wavelength light condition and darkness at any time point. These results suggest that the amount of attentional resource allocated to the oddball task was increased by daytime exposure to short-wavelength light, and that following approximately 5 min of exposure the impact of light on cortical activity related to cognitive processes was able to be detected.