Marked Intraindividual Cognitive Variability in a Sample of Healthy Graduate Students.

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From: Psychological Injury and Law(Vol. 14, Issue 3)
Publisher: Springer
Document Type: Report; Brief article
Length: 245 words

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Keywords: Keywords Intraindividual variability; Graduate students; IQ; Healthy sample; Normal variability; Misdiagnosis; Type I error Abstract In this pilot study, intraindividual variability in neurocognitive test performance was examined in 24 healthy individuals with high levels of education and average full-scale IQ of 121.9 on a short neuropsychological battery across multiple cognitive domains. Marked variability was found across all domains. Intraindividual differences between the highest and lowest z-scores ranged from 2.05 to 6.92 (M=3.89, SD=1.25). Based on the definitions of abnormality proposed by Lezak, Wechsler and Heaton, 46% of our sample participants had at least one score that was more than 2 standard deviations below the population mean 50% had at least one score that was less than the 5th percentile (z 1.0 SD) across our sample. Our findings suggest the need for caution when inferring the presence of cerebral dysfunction in high academic achievers, particularly in a medical legal setting where false-positive diagnoses may be of particular consequence. Author Affiliation: (1) Department of Psychology, University of Toronto Scarborough, 1265 Military Trail, M1C 1A4, Toronto, Ontario, Canada (2) Graduate Department of Psychological Clinical Science, University of Toronto Scarborough, 1265 Military Trail, M1C 1A4, Toronto, Ontario, Canada (3) Independent Practice, Beaverton, OR, USA (c) konstantine.zakzanis@utoronto.ca Article History: Registration Date: 06/10/2021 Received Date: 02/04/2021 Accepted Date: 06/09/2021 Online Date: 06/24/2021 Byline:

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Gale Document Number: GALE|A678066098