“…These findings, as summarized in recent meta-analyses, support the emotion dysregulation hypothesis (e.g., Wolff et al, 2018), yet it is important to note that some sources of evidence are less conclusive. For example, although numerous studies demonstrate low parasympathetic nervous system (PNS) tone and excessive PNS withdrawal during negative emotion inductions among those who engage in NSSI and SBs (Crowell, Baucom, et al, 2014; Crowell et al, 2005, 2008, 2013, 2014, 2017; Kuo & Linehan, 2009), autonomic hyperreactivity is not as consistent when using (a) other markers, such as sympathetic nervous system (SNS) responding, and (b) non–emotion induction paradigms, such as cold-pressor, acoustic startle, and public speaking tasks.…”