Ishii Akira, Ishizuka Takuya, Muta Yuki, Tanaka Masaaki, Yamano Emi, Watanabe Yasuyoshi
Department of Sports medicine, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka, 545-8585, Japan.
Department of Physiology, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka, Osaka, 545-8585, Japan.
Exp Brain Res. 2018 Jun;236(6):1735-1747. doi: 10.1007/s00221-018-5260-0. Epub 2018 Apr 11.
Fatigue sensation is an essential biological alarm that urges us to take rest to avoid disrupting homeostasis and thus plays an important role in maintaining well-being. However, there are situations in which the anticipation of unpleasant fatigue sensation undesirably reduces motivation for activity. The aim of this study was to examine whether thinking positively about the fatigue sensation would increase motivation to accomplish the workload. Fourteen healthy male volunteers participated in this study and performed a two-back test for 30 min to induce mental fatigue sensation. After their subjective level of fatigue had recovered to the baseline level, they re-experienced the fatigue sensation experienced in the two-back test positively, negatively, and without any modification (i.e., re-experienced the fatigue sensation as it was). The level of motivation to perform another two-back test they felt during the re-experiencing was assessed. The neural activity related to the re-experiencing was recorded using magnetoencephalography. The level of the motivation to perform another two-back test was increased by positively re-experiencing the fatigue sensation. The increase in delta band power in Brodmann area 7 was positively associated with the increase in motivation. These results show that positive thinking about fatigue sensation can enhance motivation and suggest that this enhanced motivation may have some effects on visual attention system.
疲劳感是一种重要的生物警报，促使我们休息以避免破坏体内平衡，因此在维持健康方面发挥着重要作用。然而，在某些情况下，对不愉快疲劳感的预期会不适当地降低活动动机。本研究的目的是检验对疲劳感进行积极思考是否会增加完成工作量的动机。14名健康男性志愿者参与了本研究，并进行了30分钟的双任务测试以诱发精神疲劳感。在他们的主观疲劳水平恢复到基线水平后，他们分别以积极、消极和不做任何改变（即按原样重新体验疲劳感）的方式重新体验了在双任务测试中经历的疲劳感。评估了他们在重新体验过程中执行另一项双任务测试的动机水平。使用脑磁图记录与重新体验相关的神经活动。通过积极地重新体验疲劳感，执行另一项双任务测试的动机水平有所提高。布罗德曼7区δ波段功率的增加与动机的增加呈正相关。这些结果表明，对疲劳感进行积极思考可以增强动机，并表明这种增强的动机可能对视知觉注意系统有一些影响。
