“Auditory mismatch negativity is a biomarker for schizophrenia thought to reflect glutamatergic N-methyl-D-aspartate receptor function and excitatory-inhibitory neurotransmission balance. However, the association of glutamate level with [auditory mismatch negativity] has not been directly examined in patients with schizophrenia, to our knowledge,”
              
              
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          Please-What is auditory mismatch negativity?