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. 2021 Apr 22;9(4):e26038. doi: 10.2196/26038

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©Mahra Alneyadi, Nidal Drissi, Mariam Almeqbaali, Sofia Ouhbi. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 22.04.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Layer diagram for a biofeedback-based system. EEG: electroencephalography; EMG: electromyography; GSR: galvanic skin response; HR: heart rate; PPG: photoplethysmography.