Abstract

Objective: Routine neuropsychological assessment rarely includes delayed recall intervals over 30-minutes in duration, but recent studies have found that individuals with temporal lobe epilepsy may only show abnormal forgetting when longer intervals have been reached. The current study examined whether there is value in adding a 4-hour delayed recall condition to the neuropsychological assessment. Method: In the context of a private neuropsychology practice, a consecutive series of examinees with TBI ranging from mild to severe (n = 43) or with brain damage due to other causes (n = 12) were administered a full neuropsychological assessment. Four hours after the delayed recall condition, examinees were asked to recall the Logical Memory subtest of the Wechsler Memory Scale-III (WMS-III) for a third time. Results: As a percent retention score of 30-minute delayed recall, the mean 4-hour delayed recall for the entire group was 83%, (SD = 16%). There was no correlation of 4-hour retention with immediate or 30-minute delayed recall scores, or with brain injury severity. Seven individuals had 4-hour retention scores of less than 60%. This group consisted of one individual with a left hemisphere stroke, one individual with probable AD, one with a learning disability, three with mild-complicated brain injuries, and one with a mild brain injury. Conclusion(s): There is a stable retention rate for stories at a 4-hour delay, and scores falling below that level may indicate problems that would not have been detected in a routine neuropsychological assessment.