Vigilance test Carda

The Ambrock vigilance test "Carda" by Randerath et al. (1997) recorded the vigilance performance over a period of 30 minutes. The patient sits in a semi-darkened room in front of a black computer screen and look at the picture of a street with a running road median and the lateral lane boundaries. They are asked to respond within one second of a with a computer keyboard button on stimuli (white flashing rectangles), which occur in time and space for 20 ms randomly. In each 10-minute interval 100 stimuli appearing, in the total period 300 will be shown. After a brief instruction and a short practice the test is started via a menu driven DOS computer program.

Fig. 5. Driving Simulator Carda by Gerdesmeyer et al. 1997, Randerath et al. 1997, 1998 Evaluation

Right and false reactions are calculated in relation to the presented events (in percentage), the latter being registered as an error. The unfounded (delayed) reactions are given in absolute numbers. The age-and gender-independent cut-off value for the error is 5.75% (SD = 11.3%) after a standardization study with healthy volunteers of Randerath and colleagues (2000). For the unfounded responses and response times are currently no cut-off values. Measurements for the reliability and validity are pending.

Fig. 5. Driving Simulator Carda by Gerdesmeyer et al. 1997, Randerath et al. 1997, 1998 Evaluation

Right and false reactions are calculated in relation to the presented events (in percentage), the latter being registered as an error. The unfounded (delayed) reactions are given in absolute numbers. The age-and gender-independent cut-off value for the error is 5.75% (SD = 11.3%) after a standardization study with healthy volunteers of Randerath and colleagues (2000). For the unfounded responses and response times are currently no cut-off values. Measurements for the reliability and validity are pending.

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