Abstract
In the field of assistance systems for powered wheelchair control, existing research considers individual differences in intelligence and psychomotor abilities only with regard to their impact on situation adaptation, which has been proven as a significant predictor of the cognitive processes going on when the actor decides on his/her future behavior. This paper investigates the direct effects of these individual differences on the variables used for intention estimation and compares their effects with the ones found for situation adaptation and for the interactions between the situation adaptation and the individual differences. The results demonstrate quite impressively that, for some variables, these direct effects play an even more important role than do the situation adaptation effects and the interaction effects. Hence, the direct effects should be considered as well. Implications about how these results can be integrated in existing intention estimation behaviors for powered wheelchair control are provided.
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