p215fig05.28 How a mismatch between bottom-up and top-down input patterns can trigger activation of the orienting system A and, with it, a burst of nonspecific arousal to the category level.<BR>||  Mismatch -> inhibition -> arousal -> reset. BU input orienting arousal, BU+TD mismatch arousal and reset.  ART Matching Rule: TD mismatch can suppress a part of F1 STM pattern, F2 is reset if degree of match < vigilance