“…There is growing interest and advancements using neuroimaging techniques (e.g., functional magnetic resonance imaging) to better understand neurobiological (brain-body) interactions (c.f., Gianaros and Sheu, 2009;Gianaros et al, 2004). For example, HF has been associated with activity within the ventral anterior cingulate (Matthews et al, 2004), posterior cingulate cortex (O'Connor et al, 2007), amygdala, periaqueductal gray, and the hypothalamus in response to somatosensory stimuli (Gray et al, 2009) and isometric exercise (Napadow et al, 2008). Given the evidence of an association between the brain and the ANS (i.e., parasympathetic and sympathetic activity), these promising research directions underscore the importance of purposeful and informed selection of HRV parameters.…”