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Human and nonhuman primate data suggest that visuospatial working memory is mediated by a neural network that includes the prefrontal cortex. Simple working memory tasks are less complex than standard neuropsychological tests of frontal dysfunction. As such, they are less vulnerable to general performance factors such as amotivation and uncooperativeness in schizophrenic patients. These tasks thus...
In order to pursue the hypothesis that the dorsolateral prefrontal cortex is a source of cognitive deficit in schizophrenia, we developed an easily administered pen-and-paper human analogue of a visuospatial working memory task that in non-human primates activates the neurons of Walker area 46 (Goldman-Rakic, 1987). Compared to normal controls, schizophrenic patients made significantly greater errors...
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