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. 2019 Aug 14;10:1716. doi: 10.3389/fpsyg.2019.01716

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Copyright © 2019 Chin and Kales.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Top portion of the figure is a schematic of each study session. Underneath are representative examples of HRV frequency domain measures during the session for three different subjects. Increased power in the green frequency band represents parasympathetic HF response. Increased power in the red frequency band represents sympathetic LF response. During the Stroop test, the top subject exhibited high flow with a balanced LF response. The bottom two subjects, at extremes of either high or low sympathetic response, reported low flow.