Corollary- and Discrepeancy-Based Approaches for Examining the Appropriateness of Premorbid Cognitive Estimation in Geriatric Schizophrenia

<p> <strong> Objective: </strong> This article addresses whether measures for assessing premorbid intellectual functioning are adequate for geriatric schizophrenia.</p><p> <strong> Method: </strong> We included geriatric schizophrenia-spectrum disorders (SSD; n=37), frontotemporal dementia (FTD; n = 41), and geriatric controls (n = 107), and employed measures of verbal ability.</p><p> <strong> Results: </strong> Pearson&rsquo;s correlations and ANOVAs for discrepancy comparisons showed unique patterns of spared function in SSD when compared to FTD and controls.</p><p> <strong> Conclusions: </strong> Findings lend support to the speci&filig;city of cognitive processes in SSD, even when accounting for processes common to the theoretically similar FTD. SSD showed a distinct pattern of spared ability which supports clinical utilization of discrepant measures of premorbid intellectual estimation for SSD.</p>