Abstract
Purpose
When examining cerebral activity, it is important to decrease a subject’s fatigue with an appropriate task design that also maintains data quality. This study evaluated how well devices designed to reduce fatigue would affect functional near-infrared spectroscopy (fNIRS) data.
Method
A WOT-100 10-channel wearable fNIRS system was used to study the prefrontal areas of thirteen healthy volunteers. The stimulation task was a consistent incongruent Stroop test, but with two variations. First, the subjects’ answers could be delivered either by vocalization or keyboard output. Second was whether or not there was an offset such as simple finger movements or vocalization during control periods. Four sessions using both variations were performed. The relative changes of fNIRS data during the stimulation periods were used as a marker for cerebral activity.
Results
There was only a significant difference in two channels (Channel 3: p = 0.040, Channel 9: p = 0.022) when voice output was used.
Conclusion
The result might have been due to voice output being generated from the temporal area, near the prefrontal area. We found that the omission of offset with keyboard output might be possible as there was only a small effect, but offset with voice output is necessary.
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Acknowledgements
The authors would like to thank Megumi Isoda, Wakana Nomura, and Yuna Yoshizawa for their help with the fNIRS examination, Sota Nakaya for assistance with programing, and Akira Iiduka for schedule coordination.
Funding
This work was supported by Grant-in-Aid (C) (KAKENHI: JP16K01497) from the Ministry of Education, Culture, Science, and Technology (MEXT) of Japan. The funder had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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SK designed the study, drafted the manuscript, and programmed the key-input version of the stimulation program. YN, KT and KS participated in the experiments, analyzed near-infrared spectroscopy and behavioral data, and helped draft the manuscript. FM programmed the script for MATLAB to process the oxygenated hemoglobin waveforms data, and provided statistical information. HM programmed the voice-input version of the stimulation program, and helped arrange the experiment room environment. HT and MN provided advice for the design of and supervised the manuscript.
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All the authors declared that they have no conflictt of interest.
Ethical Approval
The study was approved by the Gunma University Ethical Review Board for Medical Research Involving Human Subjects (HS2017-241).
Informed Consent
All of the subjects gave written informed consent to participate. All of the subjects gave written informed consent for publication.
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Kikuchi, S., Nishizawa, Y., Tsuchiya, K. et al. Effect of Omitting Offset Work on Functional Near-Infrared Spectroscopy: Comparison Between Keyboard and Voice Response. J. Med. Biol. Eng. 40, 899–907 (2020). https://doi.org/10.1007/s40846-020-00563-2
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DOI: https://doi.org/10.1007/s40846-020-00563-2