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E-ISSN : 2733-4538
This study was designed to examine the effectiveness of Korean-California Verbal Learning Test (K-CVLT) for detecting malingering. The K-CVLT was administrated to three groups: malingering group(n=28) and effortful group(n=28) with mild traumatic brain injury which were classified according to the criteria for probable Malingering of Neurocognitive Dysfunction(MND) by Click, Sherman, and Iverson(1999), and patient group without brain injury(n=27). Comparison of the z-score and the raw score among the three groups showed that the malingering group performed significantly worse than the effortful group and the patient group without brain injury across a majority of K-CVLT variables and six composite K-CVLT malingering indicators. In contrast, no statistically significant differences between the effortful and the patient groups over all the variables of K-CVLT. Therefore, the study finalized into two groups: the malingering, and the non-malingering which includes the effortful and the patient groups. As a result, for examining the sensitivity, specificity, and classification accuracy between the malingering and the non-malingering groups, the recognition discriminability (.61), total intrusion(.54), short-delay free recall(.50), long-delay free & cued recall(.50), Millis formula(.64), and six malingering indicators(.54∼.57) by Mills & Volinsky(2001) showed good sensitivity while maintaining a specificity of at least .91. Especially, the examination had significant diagnostic validity when classified between the malingering and the non-malingering groups with recognition discriminability(≤80), total intrusion(≥14), short-delay free recall(≤4), long-delay free recall(≤5), long-delay cued recall(≤6), and Millis formula(≤.52). The clinical implications and the limitations of this study are also discussed.
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