The Exner Rorschach: an analysis of its clinical validity

Area of Science:

• Psychological assessment
• Clinical psychology
• Psychopathology

Background:

• John Exner's Rorschach Comprehensive System (CS) is widely used.
• Previous analyses relied on different statistical standards.
• Normative data from 1985 and 1989 have been subject to reevaluation.

Purpose of the Study:

• To reanalyze Exner's Rorschach normative data using a stricter standard of clinical significance (N=1).
• To assess the differential diagnostic utility of the Rorschach CS for schizophrenia, depression, and character disorders.
• To evaluate the impact of updated norms (1989) excluding protocols with fewer than 14 responses.

Main Methods:

• Reanalysis of existing data from Exner's 1985 and 1989 normative samples.
• Application of a clinical significance standard appropriate for N=1.
• Comparison of Rorschach variables, particularly form quality, in differentiating patient groups.

Main Results:

• The 1989 norms, excluding short protocols, changed the number of significant variables.
• Most form quality variables showed reduced ability to differentiate between patient groups under the N=1 standard.
• The Rorschach CS demonstrated validity for schizophrenia but limited differential utility for depression and character disorders.

Conclusions:

• The Rorschach Comprehensive System shows diagnostic validity for schizophrenia.
• Its utility in differentiating depression and character disorders is limited.
• Abandoning the scoring of nonsignificant variables is recommended to improve diagnostic precision.