Two conventional time-domain ERP components elicited during a go/no-go task, the no-go N2 and no-go P3, are thought to index the cognitive and motor processes underlying response inhibition (Kopp et al., 1996; Pfefferbaum et al., 1985; Kok, 1986). The no-go N2 is a negative potential with a midline frontal distribution that peaks between 250 and 350 ms after the presentation of a stimulus associated with response inhibition (Eimer, 1993). While there is some debate as to whether the no-go N2 is an electrocortical index of response inhibition (Kok, 1986) or simply an indicator of response conflict or target detection (Nieuwenhuis et al., 2003; Donkers and Boxtel, 2004), recent research has indicated that the no-go N2 may have two functional components with separate neural generators, one involving response inhibition (mediated by the dorsal lateral and ventral prefrontal cortices), and another associated with conflict monitoring (anterior cingulate cortex; Lavric et al., 2004). The no-go P3 is also increased for demands of response inhibition, but peaks between 300 and 500 ms post-stimulus, and has a more central or anterior distribution compared to the
