Contralesional cross-over in chronic neglect: Visual search patterns reveal neglect of the ipsilesional hemispace.
Introduction: With neuropsychological rehabilitation approaches neglect patients can learn to compensate for the reduced awareness of the contralesional hemispace that is often observed after right brain damage. Here, we report contralesional "cross-over" deviations in line bisection that are hypoth...
| Published in: | NeuroRehabilitation Vol. 31; no. 2; pp. 171 - 185 |
|---|---|
| Main Authors: | , , , |
| Format: | diagnostic images research tables/charts Journal Article |
| Published: |
Sage Publications Inc.
2012
|
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=79448814&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 79448814 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10538135 3RE jtl: NeuroRehabilitation issn: 10538135 maglogo: N pubinfo: dt: 2012 vid: 31 iid: 2 pid: 344 pub: Sage Publications Inc. place: Thousand Oaks, California artinfo: ui: 79448814 104500689 104500689 10.3233/nre-2012-0787 79448814 ppf: 171 ppct: 14 formats: fmt: @attributes: type: P tig: atl: Contralesional cross-over in chronic neglect: Visual search patterns reveal neglect of the ipsilesional hemispace. aug: au: Gall, Carolin Günther, Tobias Fuhrmans, Franziska Sabel, Bernhard A. affil: Otto-von-Guericke University of Magdeburg, Medical Faculty, Institute of Medical Psychology, Magdeburg, Germany sug: subj: Unilateral Neglect Physiopathology Chronic Disease Vision Evaluation Human Descriptive Statistics Eye Movements Spatial Perception ab: Introduction: With neuropsychological rehabilitation approaches neglect patients can learn to compensate for the reduced awareness of the contralesional hemispace that is often observed after right brain damage. Here, we report contralesional "cross-over" deviations in line bisection that are hypothesized to be a result of focusing on the contralesional hemispace while the intact hemispace is "neglected". We investigate whether this unexpected pattern of deviation is related to defects in the visual field, motor intention/hypokinesia deficits or deficits in working memory. Methods: Neglect patients with and without homonymous field defects were screened for contralesional cross-over deviations in line bisection of long lines. During line bisection eye movements were recorded in two conditions with and without requiring hand movements in order to search for directional hypokinesia. Visual fields were tested with near-threshold perimetry and with supra-threshold campimetry. Results: Of 53 chronic neglect patients only 8 showed cross-over in line bisection. Evidence for directional hypokinesia was found in only one patient. Patients with cross-over focused more often to the left than to the right of the objective line midpoint. Patients with and without visual field defects did not differ in the extent of cross-over deviations. Cross-over deviation and inconsistent stimulus detection in left hemispace were correlated irrespective of the presence of a visual field deficit. Larger cross-over deviations were associated with poorer verbal working memory span, and disorganized patterns of eye movement were related to reduced visuo-spatial working memory capacity. Conclusion: Increasing awareness of the disorder and the use of compensatory strategies may have led to a cross-over shift of visual search dominance towards the neglected side resulting in an exploration deficit of the ipsilesional side. pubtype: Academic Journal doctype: diagnostic images research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
|---|