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Autonomic nervous system responses to mental stress. (A) R-to-R interval (sec) and (B) high frequency power (sec2/Hz, shown on a log scale) in response to the N-Back and Stroop tasks in all subjects. There is a significant decrease in R-to-R interval and parasympathetic withdrawal during mental stress tasks compared to baseline. SE: standard error of mean; HFP: high frequency power.
