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Probing Visual System Organization after Injury with fMRI

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Much remains to be understood about visual system malfunction following injury. Resulting deficits range from dense visual field scotomas to mild dysfunction of visual perception. Visual field perimetry is used to characterize the visual field deficits that result from visual system injury. However, standard perimetry mapping does not always correspond to underlying deficits in visual cortical function. Much patient-to-patient variability remains regarding the residual function of the visual system after injury and the capacity of individual patients for visual rehabilitation. Functional magnetic resonance imaging (fMRI) can be used to probe the function of surviving visual circuits, allowing us to classify better the pattern of injury. Identifying pathways that are potentially modifiable by training may eventually guide the development of improved strategies for visual rehabilitation.

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