ASSESSMENT OF VISUAL-SPATIAL PERCEPTION (VS) IN BRAIN-DAMAGED PATIENTS - INVESTIGATIONS OF OBJECTIVITY, RETEST RELIABILITY AND VALIDITY

Retest reliability and validity of a computational method (VS, [19]) f or the analysis of visual spatial perception in brain damaged patients was investigated. Retest reliability was tested in 20 patients (retes t interval: 1 week; range: 1-3) and varied from r=0.65-0.95 for the di fferent subtests for the ''point of subjective equality'' and r=0.39-0 .89 for the ''interval of uncertainty''. In the several investigations concerning the validity of VS. 234 patients and 10 normal subjects pa rticipated. In the first place, we found si,gnificant relationships of some of the subtests of VS to similar visual-spatial tests, but no re lationship to tests of visual object perception. Secondly, we found si gnificant relationships to certain tasks which approximated daily func tioning. In summary, the present results demonstrate the objectivity, retest-reliability and validity of VS in brain damaged patients.