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Neural effects of viewing children’s faces on mental fatigue: a magnetoencephalography study

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Abstract

We examined whether the recovery from fatigue could be facilitated by viewing the children’s faces. Seventeen healthy mothers with child or children over 6 years old participated in our experiment. After performing a 2-back task for 40 min, they viewed the pictures of children’s and adult’s faces in the target and control conditions, respectively. The target and control conditions were performed on the separate days in a two-crossover design. Neural activity caused by viewing the children’s faces was recorded using magnetoencephalography and electrocardiography was performed to assess the index of heart rate variability (low-frequency component power/high-frequency component power ratio, LF/HF) reflecting fatigue. The subjective level of mental fatigue sensation and LF/HF ratio was decreased after viewing the children’s faces and the overactivation of the visual cortex caused by performing the 2-back task, assessed by the alteration of alpha band power in the visual cortex, was attenuated by viewing the children’s faces, suggesting that viewing the children’s faces affected the time course of mental fatigue after performing the 2-back task.

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Availability of data and material

The Ethics Committee of Osaka City University which approved the protocol of our present study does not allow public sharing of the original data.

Code availability

Code for experimental task can be received by e-mail upon reasonable request.

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Acknowledgements

We wish to thank Manryoukai Imaging Clinic for assistance with the MRI scans.

Funding

This work was supported by JSPS KAKENHI grant no. 16H03248.

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Authors and Affiliations

Authors

Contributions

TM: conceptualization, methodology, investigation, formal analysis, data curation, writing-original draft, writing-review and editing; AI: conceptualization, methodology, investigation, formal analysis, data curation, writing-original draft, writing-review and editing; TY: supervision. All authors reviewed the manuscript.

Corresponding author

Correspondence to Takashi Matsuo.

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Conflict of interest

The authors declare no conflicts or competing interest.

Ethics approval

The ethics committee at Osaka City University approved the study protocol (approval number, 4343).

Consent to participate

All participants in the present study gave informed written consent to participate in this study.

Consent for publish

All participants in the present study gave consent for the publication of the result of this study.

Additional information

Communicated by Francesco Lacquaniti.

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Matsuo, T., Ishii, A. & Yoshikawa, T. Neural effects of viewing children’s faces on mental fatigue: a magnetoencephalography study. Exp Brain Res 240, 2885–2896 (2022). https://doi.org/10.1007/s00221-022-06466-9

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  • DOI: https://doi.org/10.1007/s00221-022-06466-9

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