The relationship between WAIS PA and MMPI SI is mediated by MMPI PD

Investigated the effects of MMPI PD on the relationship between WAIS PA and MMPI SI. WAIS PA performance and MMPI SI have been reported to be related negatively in university undergraduates (Schill, 1966) and related positively in psychiatric patients (Johnson, 1969). This study was derived from the assumption that Schill's undergraduates had higher MMPI PD than Johnson's patients. Data from 65 psychiatric hospital patients showed that the PA - SI relationship was negative in high PD Ss and positive in low PD Ss, in support of this assumption. Thus, WAIS PA performance does have clinical implications for assessing social involvement, but the interpretation of PA depends on MMPI PD.