Ipsilesional neglect: behavioural and anatomical features

Objective-To learn more about the behavioural and anatomical features of ip silesional neglect. Methods-Thirty consecutive patients with spatial neglect were tested on can cellation and Line bisection tasks. To learn if patients with ipsilesional neglect demonstrate the sensory-attentional or motor-intentional type of ne glect, a video apparatus was used that dissociates these determinants. Results-Five patients showed evidence of ipsilesional neglect. This phenome non was seen only on the line bisection task. All patients with ipsilesiona l neglect had lesions involving a frontal-subcortical regions. Although ips ilesional neglect evolved from early in three of five cases, the other pati ents displayed ipsilesional neglect without initial contralateral neglect, suggesting that ipsilesional neglect cannot be fully attributed to a compen satory strategy. The results of the tests that used the video apparatus ind icate that right sided frontal or subcortical injury may induce contralater al attentional or intentional "approach" behaviours. Conclusions-Ipsilesional neglect is most often associated with frontal-subc ortical lesions, cannot be entirely attributed to a compensatory strategy, and may be induced by an attentional bias, an intentional bias, or both.