Ipsilesional neglect: behavioral and anatomical correlates.

Spatial neglect is a disorder demonstrated by patients as a failure to report, respond to or orient towards stimuli, causing functional disability (Heilman & Valenstein, 1979; Barrett & Burkholder, 2006). Neglect usually results from and is most severe following right hemisphere damage (reviewed in Barrett et al., 2006) and most commonly impairs processes, or responses to, stimuli in contralesional, left space. However, spatial neglect is a complex and heterogeneous disorder (e.g., Coslett, 1997). Although contralesional neglect occurs more frequently, cases of ipsilesional or right-sided neglect after right stroke have also been described (e.g., Kwon & Heilman, 1991; Robertson, Halligan, Bergego, Homberg, Pizzamiglio, Weber & Wilson, 1994; Beschin, Basso & Della Sala, 2000). However, the literature on ipsilesional neglect is scarce and much less is known about this relatively rare disorder than its widely studied counterpart, contralesional neglect. The few cases that have been reported with lesion localization data show that frontal-subcortial lesions are more common in patients with ipsilesional, relative to contralesional neglect (Kim, Na, Kim, Adair, Lee & Heilman, 1999; Na, Adair, Choi, Seo, Kang & Heilman, 2000).