[Assessment of overinclusion in schizophrenia by a computer-assisted version of the Concept Overinclusion test]. / Erfassung des veränderten Begriffsumfangs bei Schizophrenie mit Hilfe der computergestützten Version des Begriffsumfangstests (BUT).

OBJECTIVE: A special form of formal thought disorder is the overinclusion in schizophrenia. The Begriffsumfangstest (BUT, Concept Overinclusion test) is a neuropsychological test for the assessment of this phenomenon. The test is available in a paperand- pencil version since the 1990s and now available in a computerized version. The aim of this study was a replication of the paper-and-pencil version with the computerized version of the test and also the detection of putative correlations with ego-psychopathology. METHODS: 40 patients with schizophrenia and 16 healthy controls were assessed with the BUT and with a scale for the assessment of ego-psychopathology (IPP). The tests were performed on five different time points with intervals of approximately two weeks. RESULTS: The BUT-parameters for the group of patients and the control group differed significantly. Several positive correlations were found between he values of the BUT and the IPP. CONCLUSION: The computerized Version of the BUT is also applicable for the detection of overinclusion. The relation between overinclusion as a semantic dysfunction and ego-psychopathology may lead to further psychopathological investigations concerning schizophrenic thought disorders.