Ipsilesional Neglect Associated with Attentional Bias

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Ipsilesional neglect is associated with lesions to the right front-subcortical networks and “where” perceptual-attentional bias, according to a study published in Neuropsychology.

There is not much previous existing research on ipsilesional neglect, but what research has been done supports an association between this disorder and damage to the right frontal and subcortical brain networks after stroke. It is believed that dysfunction in these networks may result in primarily “aiming” motor-intentional spatial errors.

Researchers conducted this study to confirm whether frontal-subcortical circuits are commonly affected in ipsilesional neglect and to determine the relative presence of “aiming” motor-intentional versus “where” perceptual-attentional spatial errors in these individuals.

Researchers found 12 participants with ipsilesional neglect based on a computerized line bisection task and used this task to quantify participants’ perceptual-attentional and motor-intentional errors. The researchers used lesion mapping on all participants.

The results showed that 83% of the participants had frontal/subcortical damage compared to the 27% observed in published patient samples with contralesional neglect. Researchers saw the greatest lesion overlap in frontal lobe white matter pathways. However, participants made primarily “where” rather than “aiming” special errors.

This data confirms previous research that suggested ipsilesional neglect may result from lesions to the right front-subcortical networks. Additionally, in this study ipsilesional neglect was strongly associated with “where” perceptual-attentional bias rather than “aiming.”

Ipsilesional Neglect Associated with Attentional Bias
Ipsilesional Neglect Associated with Attentional Bias

In this study, stroke researchers confirmed that damage to the right frontal-subcortical network may cause ipsilateral spatial neglect. A difference was also seen in spatial bias. For instance, the type of spatial errors among this group tended to be 'where' (perceptual-attentional) rather than 'aiming' (motor-intentional) errors.

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