“…One possibility is that the rightward bias may reflect underlying motor asymmetries (Boyadjian, Main, & Danion, 1999;Fujikake et al, 2011) or turning biases mediated by a vestibular (Robertson et al, 1994) or dopaminergic (Mohr, Landis, Bracha, Fathi, & Brugger, 2003;Mohr, Landis, Bracha, Fathi, & Brugger, 2005) asymmetry. Although these motor/vestibular mechanisms could explain asymmetries for ambulatory tasks, they have difficulty explaining asymmetries when navigating a motorized wheelchair (Nicholls, Hadgraft, et al, 2010) or in virtual-reality paradigms (Jang et al, 2009;Kim et al, 2010;Thomas, Stuckel, Gutwin, & Elias, 2009)-because these tasks operate independently of the motor effectors. In addition, vestibular effects on veering and turning behavior are typically observed only when participants are blindfolded (Cohen, 2000;Roberts, Cohen, & Sangi-Haghpeykar, 2011).…”