“…Over the past two decades this relational account of human language and cognition has gained momentum and stimulated a growing body of empirical research (e.g., O'Hora et al, 2008;Weinstein, Wilson, Drake & Kellum, 2008), applications (e.g., Hayes, 2004;Hayes, luoma, Bond, Masuda, & lillis, 2006), and conceptual controversy (see gross & Fox, 2009, for an overview).…”