Faculty of Health, Ahvaz Jundishapur University of Medical Sciences, Iran.
School of Health, Shahrekord University of Medical Sciences, Iran.
Int J Occup Saf Ergon. 2022 Sep;28(3):1353-1361. doi: 10.1080/10803548.2021.1901432. Epub 2021 Apr 5.
The present study aimed to investigate the effect of tonal noise and task difficulty on electroencephalography (EEG) and cognitive performance. Twelve healthy volunteers participated in the present study. Four noise signals were generated by four prominence tone levels (0, 2, 5 and 9) at background noise levels of 55 dBA and frequency of 500 Hz using the Test Tone Generator from Esser Audio (USA). The participants were asked to perform the tasks with low, moderate and high levels of difficulty while exposed to the noises in an acoustics laboratory. The values of reaction time, correct rate and missed numbers were recorded during each step. Moreover, the EEG signals were measured. The results showed that higher tone level and more task difficulty significantly decreased the correct rate, and increased the miss numbers. However, no significant effect was observed on reaction times. Furthermore, tone level and task difficulty significantly increased activity of the θ and β bands and decreased activity of the α band. Task difficulty and tone level could significantly affect the parameters of performance and the activity of EEG bands. Therefore, noise control can help sustain appropriate performance.
本研究旨在探讨声调噪声和任务难度对脑电图（EEG）和认知表现的影响。 12 名健康志愿者参与了本研究。使用 Esser Audio（美国）的 Test Tone Generator，通过四个突出音调水平（0、2、5 和 9）在 55dB 的背景噪声水平和 500Hz 的频率下生成四个噪声信号。要求参与者在声学实验室中暴露于噪声下时执行低、中、高难度的任务。在每个步骤中记录反应时间、正确率和错过的数字。此外，还测量了 EEG 信号。结果表明，更高的音调水平和更高的任务难度显著降低了正确率，并增加了错过的数字。然而，对反应时间没有观察到显著影响。此外，音调水平和任务难度显著增加了θ和β波段的活动，降低了α波段的活动。任务难度和音调水平会显著影响表现参数和 EEG 波段的活动。因此，噪声控制有助于维持适当的表现。
