A. The sympathetic adrenal medullary (SAM) and the hypothalamic-pituitary-adrenal axis (HPA) stress responses are depicted, as well as the main brain areas modulating the stress responses. B. The different timings of the multiple stress systems, which need to be taken into account when assessing them. In addition, different ways of quantifying the stress response are depicted. ACTH = adrenocorticotropic hormone, AUCg/i = area under the curve with respect to ground/increase, AVP = Arginine-vasopressin, CRH = corticotropin-releasing hormone, mPFC = medial prefrontal cortex