| Publication Abstract Display | | Type: Published Manuscript | | Title: Long-term stability of standard deviation of lateral position in neurocognitively normal and impaired individuals. | | Authors: Marcotte TD, Scott JS, Lazzaretto D, Roberts E, Bentley H, Rosenthal TJ, and the HNRC Group | | Year: 2004 | | Publication: Advances in Transportation Studies | | Volume: Special Issue Issue: Pages: 57-65 | | Abstract:The standard deviation of lateral position (SDLP), or degree to which individuals adjust lane position while
driving, is frequently used in human factors studies, including the evaluation of the acute effects of
medication and illicit drugs. In addition, there is increasing interest in such “real world” outcomes in the
tracking of neurologic disorders and their treatment. However, there are limited data regarding SDLP testretest
reliability over protracted periods. Previous research has demonstrated that cognitive impairments
associated with HIV infection may result in decreased driving performance. In order to examine the
appropriateness of using SDLP as a long-term outcome for patient groups, we assessed the stability of SDLP
performance on a PC-based driving simulator in HIV seropositive subjects tested at 1) a 3 month retest
interval [a time frame common to clinical trials; Short Interval Group], and 2) a year or longer retest interval
[a time period over which one might track changes in neurologic patients; Long Interval Group]. The Short
Interval Group consisted of 16 HIV seronegative and 13 early stage HIV-positive subjects. Overall test-retest
reliability (rs) was .71 (p < .001). The Long Interval Group (n = 30) was comprised of cognitively stable
HIV-positive individuals (39% with cognitive impairment). Reliability for this cohort was .72 (p < .001).
SDLP is a reliable measure for periods ranging from months to years when assessed in cognitively stable
subjects. This metric may thus serve as a useful tool in tracking long-term changes in driving abilities. |
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