ABSTRACT
An affordance is an opportunity for action that is scaled to the capabilities of an organism. For example, whether or not an object is graspable scales to an individual’s hand size (Chan, Carello, & Turvey, 1990). Recent research has extended the framework of intrinsic or body-scaled perception to interpersonal situations as well. The transition from one-hand (1H) to two-hand (2H), and two-hand (2H) to two-person (2P) grasping behavior is also scaled intrinsically (Richardson, Marsh, & Baron, 2005). The present study controls for effector size (e.g., hand-span or arm-span) in order to focus on the particular intrinsic scaling of the transition points as individuals were instructed to grasp and move wooden planks of various lengths either alone, or together with another individual.
