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Neurophysiological Processing of an Emotional Task is Sensitive to Time-of-Day

机译:情绪任务的神经生理处理对一天中的时间敏感

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Previous work from our laboratory has shown that a measure of attention to emotionally-charged stimuli, the late positive potential (LPP) event related potential (ERP), distinguished neutral from emotional pictures on a baseline day, but not after sleep deprivation. Here we sought to extend these findings and address the uncertainty about the effect of time-of-day on emotion processing by testing a morning group (8:00–10:00 a.m., n = 30) and an evening group (8:00–10:00 p.m., n = 30). We also examined the extent of diurnal changes in cortisol related to the emotion processing task. Results from this study mirrored those found after one night of sleep deprivation. Compared to the morning group, the LPP generated by the evening group (who had a greater homeostatic sleep drive) did not distinguish neutral from emotionally-charged stimuli. New to this study, we also found that there was a time-of-day effect on positive, but not negative pictures. While, as expected, cortisol levels were higher in the morning relative to the evening group, there was no relationship between cortisol and the LPP ERP emotion measure. In addition, neither time-of-day preference nor sleep quality was related to the LPP measure. These findings show that, similar to what occurs after sleep deprivation, increased sleep pressure throughout the day interferes with attention processing to emotional stimuli.
机译:我们实验室以前的工作表明,对情绪刺激的关注度,晚期正电位(LPP)事件相关电位(ERP)的注意程度在基准日是中性的,而在睡眠剥夺后则没有。在这里,我们试图扩展这些发现,并通过测试上午组(上午8:00-10:00,n = 30)和晚上组(8:00)来解决一天中的时间对情绪处理的影响的不确定性–晚上10:00,n = 30)。我们还检查了与情绪处理任务有关的皮质醇的昼夜变化程度。这项研究的结果反映了睡眠剥夺一夜后发现的结果。与早晨组相比,由晚上组产生的LPP(稳态睡眠驱动力更大)不能区分中性刺激和情绪刺激。这项研究的新手,我们还发现对正片有一天的影响,但对负片没有影响。正如预期的那样,早晨的皮质醇水平高于晚上的人群,而皮质醇和LPP ERP情绪测量之间没有关系。此外,LPP指标与每日时间偏好和睡眠质量均无关。这些发现表明,与睡眠剥夺后发生的情况类似,全天增加的睡眠压力会干扰对情绪刺激的注意力处理。

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