Thought disorder on the WAIS-R relative to the Rorschach: assessing identity-disordered adolescents

Clinical researchers have noted that compared with other diagnostic groups, adults with Borderline Personality Disorder tend to demonstrate relatively more thought disorder on unstructured projective tests (e.g., Rorschach) than on structured objective tests of cognitive performance (e.g., Wechsler Adult Intelligence Scale; WAIS). Using archival data, our study found evidence that adolescents with Identity Disorder tend to exhibit this same phenomenon. The records of 62 adolescent inpatients who had been administered the WAIS or WAIS-R and the Rorschach were examined. Of the 62 cases, 25 were diagnosed with Identity Disorder, 14 with Conduct Disorder (Group Type), 15 with Oppositional Defiant Disorder, and 8 with Schizophreniform Disorder. For each participant, the WAIS or WAIS-R and the Rorschach were scored according to the Thought Disorder Index (TDI; Johnson & Holzman). Adolescents with Identity Disorder revealed a significantly larger discrepancy between TDI scores on the WAIS or WAIS-R and TDI scores on the Rorschach than did adolescents with other diagnoses. The findings suggested that the discrepancy between the degree of thought disorder on structured versus unstructured psychological tests (i.e., differential decompensation) is related to diagnosis.