Validation of a digit symbol substitution test for use in supervised and unsupervised assessment in mild Alzheimer's disease.

Autor: Williamson M; Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia., Maruff P; Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia.; Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Victoria, Australia.; Cogstate Ltd, Melbourne, Victoria, Australia., Schembri A; Cogstate Ltd, Melbourne, Victoria, Australia., Cummins H; Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia., Bird L; Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia., Rosenich E; Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia., Lim YY; Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia.
Jazyk: angličtina
Zdroj: Journal of clinical and experimental neuropsychology [J Clin Exp Neuropsychol] 2022 Dec; Vol. 44 (10), pp. 768-779. Date of Electronic Publication: 2023 Feb 22.
DOI: 10.1080/13803395.2023.2179977
Abstrakt: Introduction: The Digit-Symbol-Substitution Test (DSST) is used widely in neuropsychological investigations of Alzheimer's Disease (AD). A computerized version of this paradigm, the DSST-Meds, utilizes medicine-date pairings and has been developed for administration in both supervised and unsupervised environments. This study determined the utility and validity of the DSST-Meds for measuring cognitive dysfunction in early AD.
Method: Performance on the DSST-Meds was compared to performance on the WAIS Coding test, and a computerized digit symbol coding test (DSST-Symbols). The first study compared supervised performance on the three DSSTs versions in cognitively unimpaired (CU) adults (n = 104). The second compared supervised DSST performance between CU ( n =  60) and mild-symptomatic AD (mild-AD, n = 79) groups. The third study compared performance on the DSST-Meds between unsupervised ( n = 621) and supervised settings.
Results: In Study 1, DSST-Meds accuracy showed high correlations with the DSST-Symbols accuracy ( r = 0.81) and WAIS-Coding accuracy ( r = 0.68). In Study 2, when compared to CU adults, the mild-AD group showed lower accuracy on all three DSSTs (Cohen's d ranging between 1.39 and 2.56) and DSST-Meds accuracy was correlated moderately with Mini-Mental State Examination scores ( r = 0.44, p < .001). Study 3 observed no difference in DSST-meds accuracy between supervised and unsupervised administrations.
Conclusion: The DSST-Meds showed good construct and criterion validity when used in both supervised and unsupervised contexts and provided a strong foundation to investigate the utility of the DSST in groups with low familiarity to neuropsychological assessment.
Databáze: MEDLINE
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