“…Such pattern violations generate characteristic voltage signatures on the human scalp called the omitted stimulus potential or the mismatch negativity (Bullock and Karamürsel, 1994; Klinke et al, 1968), which has been associated with the detection of novelty (Friedman et al, 2001; Rogers et al, 1992; Jääskeläinen et al, 2004). However, the phenomenon does not require higher brain areas or extensive networks: it has been seen in the retina (Bullock et al, 1990; Karamürsel and Bullock, 1994), and recent in vitro studies have shown that it can be robustly and precisely generated by ganglion cells, where it has been called the omitted stimulus response (OSR) (Schwartz et al, 2007a; Schwartz and Berry II, 2008). …”