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Decreased functional connectivity with aging and disease duration in schizophrenia

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/10343

Decreased functional connectivity with aging and disease duration in schizophrenia

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Title: Decreased functional connectivity with aging and disease duration in schizophrenia
Author: Abbott, Christopher
Advisor(s): Bustillo, Juan
Committee Member(s): Calhoun, Vince
Shuttleworth, Bill
Department: University of New Mexico. Biomedical Sciences Graduate Program
Subject(s): Schizophrenia
fMRI
Indepent Component Analysis
Duration of Illness
LC Subject(s): Schizophrenia--Longitudinal studies.
Brain--Magnetic resonsnce imaging.
Degree Level: Masters
Abstract: Objective: Progressive brain changes late in the disease course of schizophrenia may be detected with functional connectivity. This study compared functional connectivity between patients with schizophrenia late in the disease course with matched healthy controls. Method: Subjects included 18 patients with schizophrenia with minimum 15 years disease duration and 28 matched healthy controls from the MIND Clinical Imaging Consortium database. The functional magnetic resonance imaging paradigm was the auditory oddball task. We used independent components analysis to identify temporally cohesive but spatially distributed neural networks. We selected the executive control and default mode networks for additional analysis. The temporal course of each spatial component was then regressed with a model of the hemodynamic time course based on the experimental paradigm to measure functional connectivity. The beta weights from this regression were used for additional group level analysis. Results: The anterior default mode network had a main effect by group (patients with schizophrenia and healthy controls) and an interaction with group and aging. As the patient group aged, they had less negative modulation of the anterior default mode network. The patient group also had significantly less positive modulation of the executive control network. Conclusions: These results show evidence of changes in functional connectivity in the anterior default mode network late in the disease course of schizophrenia. The decreased functional connectivity may be attributable to the progressive disease course of schizophrenia.
Graduation Date: December 2009
URI: http://hdl.handle.net/1928/10343

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