“…The feature-specific elicitation of auditory MMN has been observed for various kinds of features such as frequency and stimulus onset asynchrony (SOA) (Levänen et al, 1993;Paavilainen et al, 2001), intensity and SOA (Paavilainen et al, 2001), frequency and duration (Levänen et al, 1993;Schröger, 1995, 2001), duration and intensity (Paavilainen et al, 2001;Schröger, 1995, 2001), frequency and location (Schröger, 1995), and location and the conjunction between frequency and intensity (Takegata et al, 1999) (but see also, e.g., Winkler et al, 1990). Although the counterpart of MMN in the visual modality has been discussed over the past few decades, it is still unclear whether a comparable MMN component exists in the visual modality (for review, see Pazo-Alvarez et al, 2003). In addition, visual MMN studies have not reported a feature-specific auditory MMN counterpart (Heslenfeld, 2003).…”