视觉疲劳对驾驶人注意能力影响的事件相关电位研究

An event related potential study of visual fatigue on drivers' attention ability

目的:利用事件相关电位(ERP)技术探讨视觉疲劳对驾驶人注意能力的影响。方法:采用Oddball经典实验范式,标准刺激:正立三角形,呈现概率70%;靶刺激:倒立三角形,呈现概率15%;新异刺激:其他图形,呈现概率15%。刺激呈现时间为50ms,刺激间隔(ISI)为1 000～1 200ms。对被试者在观看高速公路视频前和观看30分钟后进行重复测试。记录驾驶人视觉疲劳前后脑电变化。结果:视觉疲劳后,被试者的反应时延长,且差异有统计学意义。视觉疲劳后,P3a、P3b潜伏期延长、波幅显著减小。结论:视觉疲劳会导致被试者反应速度减慢、非随意注意能力及选择注意能力均下降,投入到任务中的心理资源减少。

Objective：To investigate the effect of visual fatigue on drivers＇attention ability by using the ERP.Methods：An oddball pattern was used.The standard stimulus was upright triangle,showing 70% probability;The target stimulus was inverted triangle,showing 15% probability;ISI was 50ms.Duration of stimulus was 1000～1200ms The new stimulus was other graphics,showing 15% probability.Results：Two results were compared.One was that the subjects were required not to watch the video,and the other was that the subjects were required to watch the video on the highway for 30 minutes.The subjects＇waves of EEG.It was found that the reaction time became longer after visual fatigue and it was significant.The latency of P3a and P3b prolonged and their amplitudes were significantly declined after visual fatigue.Conclusions：Visual fatigue can lead to the result that the spead of the driver＇s brain receiving and processing information becomes slower,and his ability of involuntary attention and selective attention declines,investing fever mental resources into the task.