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• W2765339924 abstract "Auditory scene analysis (ASA) dysfunction is likely an important component of the symptomatology of schizophrenia. Auditory object segmentation, the grouping of sequential acoustic elements into temporally-distinct auditory objects, can be assessed with electroencephalography through measurement of the auditory segmentation potential (ASP). Further, N2 responses to the initial and final elements of auditory objects are enhanced relative to medial elements, which may indicate auditory object edge detection (initiation and termination). Both ASP and N2 modulation are impaired in long-term schizophrenia. To determine whether these deficits are present early in disease course, we compared ASP and N2 modulation between individuals at their first episode of psychosis within the schizophrenia spectrum (FE, N = 20) and matched healthy controls (N = 24). The ASP was reduced by > 40% in FE; however, N2 modulation was not statistically different from HC. This suggests that auditory segmentation (ASP) deficits exist at this early stage of schizophrenia, but auditory edge detection (N2 modulation) is relatively intact. In a subset of subjects for whom structural MRIs were available (N = 14 per group), ASP sources were localized to midcingulate cortex (MCC) and temporal auditory cortex. Neurophysiological activity in FE was reduced in MCC, an area linked to aberrant perceptual organization, negative symptoms, and cognitive dysfunction in schizophrenia, but not temporal auditory cortex. This study supports the validity of the ASP for measurement of auditory object segmentation and suggests that the ASP may be useful as an early index of schizophrenia-related MCC dysfunction. Further, ASP deficits may serve as a viable biomarker of disease presence." @default.
• W2765339924 created "2017-11-10" @default.
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• W2765339924 date "2018-05-01" @default.
• W2765339924 modified "2023-09-25" @default.
• W2765339924 title "Reduced auditory segmentation potentials in first-episode schizophrenia" @default.
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• W2765339924 doi "https://doi.org/10.1016/j.schres.2017.10.011" @default.
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