Fig. 3.

N1 entrainment following tones. a Comparison of activity following the unexpected last 5th tone (missing 6th tone) and following the expected last 6th tone (missing 7th tone). Note the small N1 entrainment following the present and expected last 6th tone. A later, larger MMN occurs to the unexpected missing 6th tone. b Duration of alpha activity for the tone trains. Evoked potentials can be described in the low alpha range. If entrainment to the trains causes the missing 6th MMN, alpha activity to 6 tones should last longer than activity to 5 tones. The arrow labelled “No N1” indicates where an oscillatory N1 would have occurred. Such does not occur, suggesting a qualitatively different event to a missing but expected tone