Line quadrisection errors in patients with hemispatial neglect

Byung Hwa Lee, Sun U. Kwon, Jay C. Kwon, Min Jae Baek, Kwang Ho Lee, Geon Ha Kim, Kenneth M. Heilman, Duk L. Na

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Patients with left unilateral neglect misbisect lines toward the right. To discriminate between contralesional unawareness and ipsilesional hyperattention hypotheses for this ipsilesional bias, we performed the line quadrisection test on 18 patients with and 25 without neglect, and 24 normal controls. Overall the patients with neglect were unbiased when performing the left quadrisection task, but erred rightward on the right quadrisection task. These results suggest that the ipsilesional bisection errors produced by patients with neglect are primarily influenced by ipsilesional hyperattention rather than contralesional unawareness. However, further analyses showed heterogeneity of performance in left quadrisection, which can be explained by multiple factors that include the top down attention to left space associated with left quadrisection, the orienting to the salience of the line's left end, and distorted mental representation, in addition to ipsilesional hyperattention.

Original languageEnglish
Pages (from-to)372-380
Number of pages9
Issue number4
StatePublished - Aug 2011

Bibliographical note

Funding Information:
This study was supported by grants of the Korea Health 21 R&D Project by the Ministry of Health, Welfare, and Family Affairs of Korea (A050079), and the Samsung Biomedical Research Institute grant (C-A7-209-2).


  • Attention
  • Contralesional unawareness
  • Ipsilesional hyperattention
  • Line quadrisection
  • Neglect


Dive into the research topics of 'Line quadrisection errors in patients with hemispatial neglect'. Together they form a unique fingerprint.

Cite this