“…Näätänen and Picton ( 1987 ) coined the terms temporal uncertainty and event uncertainty to emphasize the qualitative difference between temporal regularities (reflecting the when aspect) and feature regularities (reflecting the what aspect; see also recent work by Sperduti et al, 2011 ; Arnal and Giraud, 2012 ; Hughes et al, 2013 ; Schwartze et al, 2013 ). Location, reflecting the where aspect, may constitute yet another qualitatively different feature (Rauschecker and Tian, 2000 ; Schwartz and Shinn-Cunningham, 2010 ). Thus, although the different features were initially treated as somewhat interchangeable to demonstrate the general principle of predictability effects in ASA, their specific effects should be disentangled in future studies (for an analogy in simultaneous ASA, see Kitterick et al, 2010 ).…”