Re-examination of CPM performance and neglect in lateralized brain injury.

The current study examines the effects of lateralized brain injury on Raven's Coloured Progressive Matrices (CPM) performance. Archival data on 106 unilateral brain-damage patients, 59 with right hemisphere damage and 47 with left, was utilized to examine four aspects of differential performance. Right brain-damaged subjects performed significantly lower than left brain-damaged subjects overall on the CPM. They also showed evidence of a higher incidence of and greater severity of hemi-neglect. After partialling out the effects of hemi-neglect, the subject groups were no longer significantly different on overall CPM performance. Evidence supporting the presence of heterogeneous subtests was not found. The results support the emerging pattern in research findings indicating that hemi-neglect plays a central role in differential performance. The CPM appears limited in its application and interpretation for patients with hemi-neglect.