Objective: The goal of this project is to develop and validate a test that jointly measures episodic memory and performance validity. We have initiated development of an episodic memory test, the Levels of Processing Memory Test (LPMT), that is self-validating without the use of any additional procedures that require more assessment time. Method: Participants, n = 90, were undergraduate students and community dwelling older adults recruited from the student body at the University of Colorado Colorado Springs and an existing research registry, respectively. Volunteers were administered the newly-developed LPMT along with subtests from the Neuropsychological Assessment Battery (NAB) Memory and Spatial Modules, the Word Memory Test (WMT), and the Victoria Symptom Validity Test (VSVT). We used item response theory (IRT), with a correction for guessing, to model episodic memory ability as a function of performance on the 72 LPMT items. IRT-derived person fit statistics were used to identify individuals whose patterns of responding was inconsistent with the latent variable model underlying LPMT performance. We also examined the relationship between LPMT performance and performance on other tests in order to evaluate construct and criterion validity. Results: Two participants, both older adults, failed the WMT but no other tests of performance validity. A three-parameter logistic IRT model was fit to the LPMT data. As expected, deeper levels of processing were associated with better recall on the test, with recall accuracy rates of 47% for shallow, 75% for medium, and 81% for deep encoding. Eleven LPMT items were found to be particularly useful at discriminating between low and high episodic memory abilities, with item discrimination parameters greater than 10.0. A post-test survey asked participants to explain their attitudes about effort and performance validity. Older adults (50% reporting giving their best effort) were more likely to report mixed effort than younger adults (84% reported giving their best effort) and expressed different attitudes about their approach to testing. Conclusion: These preliminary data suggest the LPMT may be useful at measuring episodic memory while simultaneously providing information about performance validity. The data also suggest that idiosyncratic approaches to performing at one's best may vary by age group.
Psychometric Test Development and Assessment-3
Development of a Novel Test to Jointly Measure Episodic Memory and Performance Validity
B Gavett; Psychometric Test Development and Assessment-3
Development of a Novel Test to Jointly Measure Episodic Memory and Performance Validity. Arch Clin Neuropsychol 2016; 31 (6): 577. doi: 10.1093/arclin/acw042.11
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