Sustained attention test Carsim

The Ambrock sustained attention test "Carsim" by Büttner et al. (2000a/b, 2001) recorded its performance over a period of 30 minutes. The image with a road median and lane boundary is simulated polychrome. On the right side of the road obstacles (in the kind of no entry signs) can be presented, which are only briefly visible in each case (e.g. for 200 ms). Their appearance is timely random, in which a fixed number of events can be adjusted with a 5-minute section. The patient now has the task to keep up with the help of a steering wheel in his lane the ideal track (tracking) and by using of two buttons (both same function), which are located on the steering console, to respond on appearing obstacles (visual search).

Fig. 6. Driving Simulator Carsim by Büttner et al. 1999, 2000 Evaluation

Depending on the steering wheel movements, the position of the vehicle on the road will be recalculated and visualized on-line. The program records the time deviation from the ideal line (tolerance deviation time) and of the lane (tracking deviation time) and the right, the missing, the unfounded reactions and the reaction time (Büttner et al. 2000a/b, Büttner 2001). Tolerance or track deviation is the number of tracking errors, which in absolute terms described, exceeds the tolerance and lane width in the test. By converting the number of pixels we obtain the time in seconds, which was driven outside the tolerance range or beyond the roadway.

Fig. 6. Driving Simulator Carsim by Büttner et al. 1999, 2000 Evaluation

Depending on the steering wheel movements, the position of the vehicle on the road will be recalculated and visualized on-line. The program records the time deviation from the ideal line (tolerance deviation time) and of the lane (tracking deviation time) and the right, the missing, the unfounded reactions and the reaction time (Büttner et al. 2000a/b, Büttner 2001). Tolerance or track deviation is the number of tracking errors, which in absolute terms described, exceeds the tolerance and lane width in the test. By converting the number of pixels we obtain the time in seconds, which was driven outside the tolerance range or beyond the roadway.

Standardization and quality criteria

The average error of the tracking deviation time was 2.3 ± 4.5 s in the calibration sample, the limit of the track deviations of healthy persons in a 95% confidence interval was < 13.2 s, 98% of healthy individuals have had values between 0 to 150 track deviations. The mean error of tolerance deviation time was 96.0 ± 177.0 s in the healthy person's, the limit of tolerance deviations of the calibration sample in a 95% CI was < 450.4 s (Büttner et al. 2000a/b, Büttner 2001).

The verification of the reliability using the Cronbach alpha was for the tracking component r = .9785, for the visual search r = .9666 and for the reaction time = .8943. The verification of the test-retest reliability (after 3 days) was for the tracking component rtt = .9855, for the visual search rtt = .9447 and for the reaction time rtt = .9211 (Büttner et al. 2000a/b, Büttner 2001).

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