The Trail Making Test (TMT) is one of the most frequently used measures in clinical neuropsychology. Data obtained from the TMT practice times were analyzed to determine their utility in predicting success and failure on the full version of the test and to allow establishment of criteria by which to judge administration or discontinuation of the full test. Results indicated that TMT practice times were useful in predicting successful completion of Part A and B of the TMT. Tables are provided which describe the classification accuracy of various TMT practice times. These tables allow clinicians to select a practice-time cutoff and then use the cutoff as a heuristic to assist in the decision to administer the remainder of that particular part of the TMT or discontinue the test. A 20-s cutoff resulted in optimal prediction of successful completion (< 180 s) of TMT Part A. A cutoff of 30 s optimally predicted successful completion (< 300 s) of TMT Part B.
The current study assessed the internal consistency, alternate forms reliability, and convergent/divergent validity of the Naming Test of the Neuropsychological Assessment Battery (NAB) in patients with acquired brain injury. Fifty-nine patients were administered the NAB Naming Test (forms 1 and 2) and the Boston Naming Test (BNT), as well as other tests of neuropsychological functioning. Forms 1 and 2 of the NAB Naming Test demonstrated adequate internal consistency and alternate forms reliability. The NAB Naming Test was significantly associated with scores from the BNT, as well as scores from tests that assess visuospatial skills, semantic fluency, and verbal memory. The divergent validity of the NAB Naming Test was demonstrated by non-significant associations with tests of attention and processing speed. BNT scores correlated significantly with the educational level and estimated premorbid intelligence but not age, whereas the NAB Naming Test scores only correlated significantly with estimated premorbid intelligence. The current study provides independent validation supporting the utility of the NAB Naming Test for patients with acquired brain injury.
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