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• W2023243449 abstract "Sensory processing deficits in schizophrenia have been documented for several decades, but their underlying neurophysiological substrates are still poorly understood. In the visual system, the pattern of pathophysiology reported in several studies is suggestive of dysfunction within the magnocellular visual pathway beginning in early sensory cortex or even subcortically. The present study used functional magnetic resonance imaging to investigate further the neurophysiological bases of visual processing deficits in schizophrenia and in particular the potential role of magnocellular stream dysfunction. Sinusoidal gratings systematically varying in spatial frequency content were presented to subjects at low and high levels of contrast to differentially bias activity in magnocellular and parvocellular pathways based on well established differences in neuronal response profiles. Hemodynamic responses elicited by different spatial frequencies were mapped over the occipital lobe and then over the entire brain. Retinotopic mapping was used to localize the occipital activations with respect to the boundaries of visual areas V1 and V2, which were demarcated in each subject. Relative to control subjects, schizophrenia patients showed markedly reduced activations to low, but not high, spatial frequencies in multiple regions of the occipital, parietal, and temporal lobes. These findings support the hypothesis that schizophrenia is associated with impaired functioning of the magnocellular visual pathway and further suggest that these sensory processing deficits may contribute to higher-order cognitive deficits in working memory, executive functioning, and attention." @default.
• W2023243449 created "2016-06-24" @default.
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• W2023243449 date "2008-07-23" @default.
• W2023243449 modified "2023-10-16" @default.
• W2023243449 title "Magnocellular Pathway Impairment in Schizophrenia: Evidence from Functional Magnetic Resonance Imaging" @default.
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• W2023243449 doi "https://doi.org/10.1523/jneurosci.1852-08.2008" @default.
• W2023243449 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6670855" @default.
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