“…Studies vary on how RSA is quantified with some using spectral analysis (Miskovic, Schmidt, Georgiades, Boyle, & MacMillan, 2009; Scheinin et al, 1999; Wolff, Wadsworth, Wilhelm, & Mauss, 2012) while others use time-domain peak valley analysis (El-Sheikh & Whitson, 2006; Hinnant & El-Sheikh, 2009; Willemen et al, 2009) or the Porges adaptive polynomial filter method (Calkins et al, 2007; Graziano, Keane, et al, 2007; Hastings, Nuselovici, et al, 2008; Porges et al, 1996). The Society for Psychophysiological Research’s Task Force committee concluded that no single measure for quantifying RSA can be viewed as the gold standard as each of approaches offers advantages and disadvantages (Berntson et al, 1997).…”