N-acetyl aspartate concentration in the anterior cingulate cortex in patients with schizophrenia: a study of clinical and neuropsychological correlates and preliminary exploration of cognitive behaviour therapy effects.

Healthy participants : NAA concentration correlated positively with working memory as assessed by the letter number test and short-term memory as assessed by the Hopkins verbal learning test, though these correlations were reduced to a trend level of significance after controlling for GM concentration ( Table 5 ).

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