One-day test-retest reliability of neuropsychological tests in a personal injury case.

The difficulties inherent in differentiating practice effects from meaningful changes in neuropsychological retest data are well known to clinicians. Although gross actuarial guidelines are available on the basis of group studies, the application of such information to individual cases presents many interpretive complexities. This is particularly true when litigation is involved or the retest interval is very short. The case presented here involved examinations performed independently on successive days by 2 diplomate neuropsychologists. The majority of tests produced clinically equivalent results in both examinations