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Ipsilesional Neglect: Behavioral and Anatomical Correlates #MMPMID25180980
Sacchetti DL; Goedert KM; Foundas AL; Barrett A
Neuropsychology 2015[Mar]; 29 (2): 183-90 PMID25180980show ga
Objective: The sparse existing research on ipsilesional neglect supports an association of this disorder with damage to the right frontal and subcortical brain networks. It is believed that dysfunction in these networks may result in primarily ?aiming?, motor-intentional spatial errors. The purpose of this study was to confirm whether frontal-subcortical circuits are indeed commonly affected in ipsilesional neglect and to determine the relative presence of ?aiming?, motor-intentional versus ?where?, perceptual-attentional spatial errors in these individuals. Methods: We identified 12 participants with ipsilesional neglect based on a computerized line bisection task and used the line bisection data to quantify participants' perceptual-attentional and motor-intentional errors. We were able to discriminate between these two biases using the algebraic solutions for two separate equations, one for ?aiming? and one for ?where? biases. Lesion mapping was conducted for all participants using MRICroN® software; lesion checklist and overlap analysis were created from these images. Results: A greater percentage of participants with ipsilesional neglect had frontal/subcortical damage (83%) compared to the expected percentage (27%) observed in published patient samples with contralesional neglect. We observed the greatest area of lesion overlap in frontal lobe white matter pathways. Nevertheless, participants with ipsilesional neglect made primarily ?where? rather than ?aiming? spatial errors. Conclusion: Our data confirms previous research suggesting that ipsilesional neglect may result from lesions to the right frontal-subcortical networks. Furthermore, in our group, ipsilesional neglect was also strongly associated with primarily ?where?, perceptual-attentional bias, and less so with ?aiming? motor-intentional spatial bias.
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Neuropsychology 2015 ; 29 (2): 183-90
