Subjective versus objective measures of distress, arousal and symptom burden in patients with functional seizures and other functional neurological symptom disorder presentations: A systematic review.

In other studies in this category, correlations between both baseline and post-stress biological/physiological markers (e.g., HRV, salivary cortisol and amylase) and perceived stress or subjective arousal (measured by the Stress Symptoms Inventory and stress on visual analogue scales) widely ranged in strength (r = -0.74 – 0.33) but did not reach statistical significance [17] , [30] , [32] , [33] .

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