“…To be clear about our intentions here, we need to acknowledge that past SNP procedures have used either "peripheral" (i.e., SNP-peripheral: Chao, 2009;Christie & Klein, 2001;Tipper, Brehaut, & Driver, 1990) or "central" (i.e., SNP-central: e.g., Buckolz et al, 2008;Fitzgeorge et al, 2011;Guy, Buckolz, & Fitzgeorge, 2007;Guy, Buckolz, & Khan, 2006;Guy, Buckolz, & Pratt, 2004;Neill et al, 1994) event locations. Central locations subtend a visual angle of about 2.5˚ or less so that delivered events fall wholly or partially within the fovea area of the retina, while peripheral locations naturally extend outside this area (i.e., parafoveally).…”