Abstract
Right hemisphere brain damage often results in visual-spatial deficits. Because various microstructural changes of the superior longitudinal fasciculus (SLF) after a stroke in the right hemisphere affect visual perception, including neglect, the present study investigates the relationship between both microstructural change and lateralization of SLF and visual perception, using diffusion tensor imaging (DTI) in patients with lesions in the right hemisphere. Eight patients with strokes (five patients with intracranial hemorrhage, and three patients with infarction; mean age of 52.5 years) and 16 mean-age-matched healthy control subjects were involved in this study. The visual perception of all eight patients was assessed with the motor-free visual perception test (MVPT), and their SLFs were reconstructed using DTI. The results showed that there was a significant difference between the DTI parameters of the patients and the control subjects. Moreover, patients with microstructural damage to the right SLF showed impairment of visual perception. In patients with damage to both the dorsal and ventral pathways of the right SLF, spatial neglect was present. However, although a leftward SLF asymmetry was revealed in our patients, this lateralization did not show a relationship with visual perception. In conclusion, the microstructural changes of the right SLF play an important role in visual perception, and both pathways contribute to spatial neglect, but leftward lateralization of the right SFL activity after a stroke does not contribute to general visual perception.
Highlights
Visual perceptual deficits are primarily the result of right cerebral hemisphere damage that occurs following a stroke [1]
This study investigated the microstructural change of superior longitudinal fasciculus (SLF) after a stroke in the right hemisphere investigated the microstructural change of1SLFs after a stroke in the characteristics right hemisphere usingThis
Table list the demographical characteristics of our eight patients with a stroke in the right hemisphere
Summary
Visual perceptual deficits are primarily the result of right cerebral hemisphere damage that occurs following a stroke [1]. These deficits have been explained as a deterioration in the process of unconscious inference from the information contained in the visual images produced by interactions from the frontal to the parietal lobe [2,3]. 75% of patients with brain damage, and often lead to severe restrictions of independent functioning [3]. In these patients, the processing of visual information is often impaired. A comprehensive assessment of perceptual impairments can be conducted using the motor-free visual perception test (MVPT) [3,9]
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