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The Neural Substrates of Self-Evaluation of Mental Fatigue: A Magnetoencephalography Study

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  • Akira Ishii
  • Masaaki Tanaka
  • Yasuyoshi Watanabe

Abstract

There have been several studies of the neural mechanisms underlying sensation of fatigue. However, little is known about the neural mechanisms underlying self-evaluation of the level of fatigue. The aim of this study was to identify the neural substrates involved in self-evaluation of the level of mental fatigue. We used magnetoencephalography (MEG) with high temporal resolution on 14 healthy participants. During MEG recordings, participants were asked to evaluate their level of mental fatigue in time with execution cues (evaluation trials) or to do nothing in time with execution cues (control trials). The MEG data were analyzed with equivalent current dipole (ECD) and spatial filtering methods to localize the neural activity related to the evaluation of mental fatigue. The daily level of fatigue sensation was assessed using the Checklist Individual Strength questionnaire. In evaluation trials, ECDs were observed in the posterior cingulate cortex (PCC) in seven of 14 participants, with a mean latency of 366.0 ms. The proportion of the participants with ECDs in the PCC was higher in evaluation trials than in control trials (P

Suggested Citation

  • Akira Ishii & Masaaki Tanaka & Yasuyoshi Watanabe, 2014. "The Neural Substrates of Self-Evaluation of Mental Fatigue: A Magnetoencephalography Study," PLOS ONE, Public Library of Science, vol. 9(4), pages 1-8, April.
    • Handle: RePEc:plo:pone00:0095763
    DOI: 10.1371/journal.pone.0095763
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