“…In addition, Gerton, Brown, Meyer-Lindenberg, Kohn, and Holt (2004) used PET to observe greater bilateral activation in the dorsolateral prefrontal cortex during backward, relative to forward, digit recall. It should be noted, however, that any explanation based on phonological representation would predict effects of related manipulations (e.g., phonological similarity) in both recall directions (Rosen & Engle, 1997), a prediction for which there has been some contrasting evidence (e.g., Bireta et al, 2010;Guerard, Saint-Aubin, Burns & Chamberland, 2012).…”