In an extended review of the literature dealing with low alcohol effects, Krüger et al. (1990, 1994) introduced a new classification system for the study variables. Main characteristics of the new system were the ability to distinguish between automatic and control processes in performance areas and the explicit introduction of social effects (social moods, social behaviour). For each of the categories, hazard functions were calculated that showed loss of efficiency (and diminished performance) as alcohol concentration increases. Because the same classification system was used by Berghaus (1995) in his review of marihuana effects, it is now possible to compare hazard functions for both alcohol and marihuana effects and thus determine equipotential concentrations of alcohol and marihuana for the different classes of variables. (A)
Abstract