Résumé
This chapter evaluates the hypothesis that body sway can be modulated to facilitate the perception of affordances. It concentrates on actions that can facilitate the perception of affordances. Mark, Balliet, Craver, Douglas, and Fox found that ordinary body sway was sufficient to permit learning about maximum sitting height, but Mark et al. did not collect quantitative data about body sway. There were general effects of the judgment task on sway. Participants tended to sway less when they were engaged in the judgment task than when they were not. Over the course of the experimental sessions participants selectively increased sway between judgments, while maintaining a constant level of sway during judgments.