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• W4210292015 abstract "Abstract Visual shape completion is a canonical perceptual organization process that integrates spatially distributed edge information into unified representations of objects. People with schizophrenia show difficulty in discriminating completed shapes but the brain networks and functional connections underlying this perceptual difference remain poorly understood. Also unclear is whether similar neural differences arise in bipolar disorder or vary across the schizo-bipolar spectrum. To address these topics, we scanned (fMRI) people with schizophrenia, bipolar disorder, or no psychiatric illness during rest and during a task in which they discriminated configurations that formed or failed to form completed shapes (illusory and fragmented condition, respectively). Multivariate pattern differences were identified on the cortical surface using 360 predefined parcels and 12 functional networks composed of such parcels. Brain activity flow mapping was used to evaluate the likely involvement of resting-state connections for shape completion. Illusory/fragmented task activation differences (“modulations”) in the dorsal attention network (DAN) could distinguish people with schizophrenia (AUCs>.85) and could trans-diagnostically predict cognitive disorganization severity. Activity flow over functional connections from the DAN could predict secondary visual network modulations in each group, except among those with schizophrenia. The secondary visual network was strongly and similarly modulated in each subject group. Task modulations were dispersed over a larger number of networks in patients compared to controls. In summary, abnormal DAN activity emerges during perceptual organization in schizophrenia and may be related to improper attention-related feedback into secondary visual areas. Patients with either disorder may compensate for abnormal perception by relying upon non-visual networks." @default.
• W4210292015 created "2022-02-08" @default.
• W4210292015 creator A5026517414 @default.
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• W4210292015 date "2022-01-28" @default.
• W4210292015 modified "2023-10-06" @default.
• W4210292015 title "Brain network mechanisms of visual perceptual organization in schizophrenia and bipolar disorder" @default.
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• W4210292015 doi "https://doi.org/10.1101/2022.01.26.22269913" @default.
• W4210292015 hasPublicationYear "2022" @default.

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