title: [Significance of material factors in the assessment of cognitive functional disorders in patients with a dementia syndrome].
abstract: In 1973 a psychodiagnostic instrument was developed that used slides as stimulus material. This instrument proved to be reliable in measuring functional disabilities in psychogeriatric patients. However, use of slides meant a serious drawback for those working in ambulatory practice. As an alternative, photographs were printed from the original slides. To evaluate their usefulness, 29 patients selected from two psychogeriatric hospitals were examined with both versions, slides and photographic prints, with an interval of 2-3 weeks between sessions. The average performance on one subtest (the perception of overlapping figures) improved on successive trials. A high degree of association (greater than or equal to .80), measured by Pearson's product moment correlation coefficient, was found for three subtests: object naming, reading aloud and the perception of line drawings. Performance on these subtests did not differ significantly between the two test versions. Two subtests yielded significantly better results when they were slide projected: the recall of five simple objects and the perception of ordinary situations. It is assumed that the results may be due to differences in experimental circumstances, which seemed beneficial to aspects of concentration in the slide condition. On average, the performance on the remaining subtests (clock reading, category fluency, text comprehension and recall, the perception of overlapping figures and recognition memory) does not differ for the slide presentation and for photographic print presentation. However, the moderately low correlations between the two versions of these subtests do not justify the conclusion that presentation by slides is equivalent to presentation by photographic prints.
mesh_terms: D000368:Aged; D001296:Audiovisual Aids; D003072:Cognition Disorders / Q000175:diagnosis / Q000523:psychology*; D003704:Dementia / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008606:Mental Processes; D009483:Neuropsychological Tests / Q000379:methods*
vernacular_title: De betekenis van materiaalfactoren in het onderzoek van cognitieve functiestoornissen bij patiänten met een dementiesyndroom.