Abstract

This investigation assessed the impact of three cognitively demanding tasks on cognitive performance, subjective, and physiological indicators of mental fatigue. Following familiarization, participants completed four testing sessions, separated by 48 h. During each session, participants watched a 45-min emotionally neutral documentary (control) or completed one of the following computer tasks: Psychomotor Vigilance Task (PVT); AX-Continuous Performance Test (AX-CPT); or Stroop Task. Mental fatigue was assessed before and at regular periods for 60 min following the 45-min treatments. Cognitive performance was assessed using 3-min PVT, and task performance. Subjective assessments were conducted using the Brunel Mood Scale, and visual analog scales (VAS). Physiological indicators of mental fatigue included electroencephalography (EEG), and heart rate variability (HRV). Subjective ratings of mental fatigue increased from pre to 0-min post in all-treatments, but not the documentary (p < 0.05). Subjective fatigue (VAS) remained higher (p < 0.05) than pretreatment values for 20-, 50-, and 60-min following the PVT, Stroop, and AX-CPT respectively. The cognitively demanding tasks had unclear effects on 3-min PVT, EEG, and HRV assessments. Tasks requiring response inhibition appear to induce fatigue for longer durations than a simple vigilance task. Simple VAS appear to be the most practical method for assessing mental fatigue.

摘要

这项调查评估了三个认知要求较高的任务对心理疲劳的认知表现，主观和生理指标的影响。熟悉后，参与者完成了四个测试会议，相隔48小时。在每个环节中，参与者观看了45分钟的情感中立的纪录片（对照）或完成了以下计算机任务之一：心理运动警戒任务（PVT）；AX连续性能测试（AX-CPT）；或Stroop Task。在45分钟的治疗之前和之后的60分钟内定期评估精神疲劳。使用3分钟的PVT和任务绩效评估认知能力。使用布鲁内尔情绪量表和视觉模拟量表（VAS）进行主观评估。精神疲劳的生理指标包括脑电图（EEG），和心率变异性（HRV）。在所有治疗中，精神疲劳的主观评价从治疗前的0分提高到治疗后的0分钟，但纪录片没有（p  ＜0.05）。 分别在PVT，Stroop和AX-CPT后20分钟，50分钟和60分钟，主观疲劳（VAS）仍高于预处理值（p <0.05）。认知要求很高的任务对3分钟的PVT，EEG和HRV评估没有明确的影响。与简单的警惕任务相比，需要抑制反应的任务似乎会导致疲劳持续时间更长。简单的VAS似乎是评估精神疲劳的最实用方法。