Figure 7.

MedDrive's ability to model the effects of alcohol on driving simulator performance. Blood alcohol was controlled at four different concentrations in 20 young healthy drivers, and the effects of alcohol on the standard deviation of the lateral position during three driving simulator tasks was measured. (A) Schematic representation of causal links between alcohol, driving simulator performance, and MedDrive score. Numbers represent the ability of each link to model the effects of alcohol at an individual's level (R²). ^*p < 0.001. Dashed lines mean that we do not assume a causal relationship between measures. Density distribution plot of the correlation between SDLP and MedDrive score (B) or Movement detection task (C). The oblique orientation of the distribution associated to the gradient of BACs illustrates the shared causal link of effects of alcohol on driving performance and on MedDrive score. (C) Density distribution plot of the correlation between SDLP and MedDrive's Task 3 score. Even if the oblique gradient is less obvious than for the MedDrive score, the movement detection task alone was still able to model the effects of alcohol on SDLP (R² = 0.178, p = 0.027). BAC, blood alcohol concentration; SDLP, standard deviation of lateral position; R², coefficient of determination.