Perceptual and attentional asymmetries in schizophrenia: further evidence for a left hemisphere deficit

Carter, Cameron S.; Robertson, Lynn C.; Nordahl, Thomas E.; Chaderjian, Marc; O'Shora-Celaya, L.

doi:10.1016/0165-1781(96)02849-1

Cited by 55 publications

(51 citation statements)

References 29 publications

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“…59 Patients with schizophrenia have a selective deficit in the ability to process hierarchical stimuli at the local level. 60,61 Such a deficit is consistent with the reduced P1 amplitude observed in this study and suggests that the perceptual closure deficit may be due in part to the reduced ability of patients to process local features of the fragmented stimuli.…”

Section: Commentsupporting

confidence: 88%

Impaired Visual Object Recognition and Dorsal/Ventral Stream Interaction in Schizophrenia

Doniger

Foxe²,

Murray³

et al. 2002

Arch Gen Psychiatry

308

254

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Patients with schizophrenia are profoundly impaired in perceptual closure as indicated by both impaired performance and impaired N(cl) generation. The selective impairment in dorsal stream P1 is consistent with prior reports of impaired magnocellular processing in schizophrenia. By contrast, intact ventral N1 generation suggests that the initial stages of ventral stream processing are relatively preserved and that impaired magnocellular dorsal stream functioning in schizophrenia may lead to secondary dysregulation of ventral stream object recognition processing.

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Section: Commentsupporting

confidence: 88%

Impaired Visual Object Recognition and Dorsal/Ventral Stream Interaction in Schizophrenia

Doniger

Foxe²,

Murray³

et al. 2002

Arch Gen Psychiatry

308

254

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“…Local processing deficits have been consistently found in chronically ill schizophrenia patients in divided (ie, unbiased) attention conditions. 39,40 A local processing deficit was also found in early onset schizophrenia, but shifts of attention from the global to the local level accounted for the finding. 41 Directing attention toward the local level eliminated the local processing deficit in all 3 studies.…”

Section: Introductionmentioning

confidence: 69%

“…39,40,73 This pattern of findings has been interpreted as evidence of an attentional deficit that can be compensated by exogenous manipulation of attention. Although this interpretation may be correct, it is not possible to rule out the alternative possibility that the local processing deficit is a secondary effect of an impairment shifting attention from the global to the local level.…”

Section: Do Schizophrenia Patients Have a Local Processing Deficit?mentioning

confidence: 96%

Schizophrenia Patients Show Deficits in Shifts of Attention to Different Levels of Global-Local Stimuli: Evidence for Magnocellular Dysfunction

Coleman

Cestnick

Krastoshevsky

et al. 2009

Schizophrenia Bulletin

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Abnormalities of attention and visual perception are well documented in schizophrenia. The global-local task is a measure of attention and perceptual organization that utilizes visual stimuli comprised of large letters (global level) made up of smaller letters (local level). Subjects identify target letters appearing at either the global or local level of the stimulus. In this study, we used a version of the global-local task specifically designed to examine lateralized hemispheric processing and attention shifting in 30 schizophrenia patients and 24 normal controls. Global-local stimuli were presented in couplets (consecutive pairs). Reaction time for the second target in a couplet was compared under conditions in which the target remained at the same level (global-global, local-local) and when the target changed levels (global-local, local-global). Level-specific priming (ie, global to global and local to local) and the local-to-global level shift were similar in both groups. Schizophrenia patients were significantly slower, however, shifting attention from the global to the local level. These results implicate an impairment in shifting attentional resources from predominantly right lateralized magnocellular/dorsal stream processing of global targets to predominantly left lateralized parvocellular/ventral stream processing of local targets. Local interference effects in global processing provide further support for impaired magnocellular processing in schizophrenia patients.

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“…Lesions or seizures in the left temporal lobe of the brain, particularly in the superior gyrus, can produce hallucinated voices, typically in the right ear (Tanabe, Sawada, Asai, Okuda & Shiraishini, 1986). Additionally, people with auditory hallucinations have been found to have reduced metabolism in brain regions associated with language and speech processing (Cleghorn, Franco, Szechtman, Brown, et al, 1992), smaller left superior temporal gyri (Barta, Pearlson, Powers, Richards & Tune, 1990), and deficits in attentional tasks requiring the involvement of the left temporal cortex (Carter, Robertson, Nordahl, Chaderjian & Oshora-Celaya, 1996). articles text shape the experience.…”

Section: Voices May Indicate a Non-psychiatric Medical Conditionmentioning

confidence: 99%

Hearing voices: Explanations and implications.

Ritsher¹,

Lucksted²,

Otilingam³

et al. 2004

Psychiatric Rehabilitation Journal

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Perceptual and attentional asymmetries in schizophrenia: further evidence for a left hemisphere deficit

Cited by 55 publications

References 29 publications

Impaired Visual Object Recognition and Dorsal/Ventral Stream Interaction in Schizophrenia

Impaired Visual Object Recognition and Dorsal/Ventral Stream Interaction in Schizophrenia

Schizophrenia Patients Show Deficits in Shifts of Attention to Different Levels of Global-Local Stimuli: Evidence for Magnocellular Dysfunction

Hearing voices: Explanations and implications.

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