Mismatch Negativity in Chronic Schizophrenia and First-Episode Schizophrenia

Abstract

MISMATCH NEGATIVITY (MMN) is a brainwave to stimuli deviating from preceding repetitive stimuli, thought to reflect the operations of echoic memory, generally uninfluenced by cognitive operations.^1,2(However, some studies^3,4 report small attention effects.) Mismatch negativity has been elicited by changes in pitch,⁵ intensity,⁶ location,⁷ and tone sequences.⁸ The MMN is reliable⁹ across sessions.