Modeling prehensile actions for the evaluation of Tangible User Interfaces

Abstract

Abstract. Prehension, or reaching-to-grasp is a very common movement performed by users of Tangible User Interfaces (TUIs) because through this movement users can manipulate tangible artifacts. Here we present an experiment that provides evidence towards the hypothesis that prehensile movements can be modeled based on the amplitude of the prehension movement. We then explore consequences of this evidence on the modeling and evaluation of TUIs using tools that can predict task completion times, such as Goals, Operators, Methods and Selection Rules (GOMS), as well as the implications for TUIs compared to Direct Manipulation Interfaces.

Codein—A New Notation for GOMS to Handle Evaluations of Reality-Based Interaction Style Interfaces

“…L. MacKenzie & Iberall, 1994). Thus, we developed a prehension operator (Christou, Ritter, & Jacob, 2008) and used it to calculate a prediction for the prehension action. Second, GOMSL cannot compute the completion time of 540 the method "Find Required File" because there are no primitive operators defined for the steps of this method and because of its iterative nature.…”

Modeling Prehension for Physical Collaboration in Virtual Environments

“…Previous studies have demonstrated only weak to moderate strength models of prehension using Fitts' law, and recent work has even focused on finding a better model for complex tasks. Christou, Ritter, and Jacob (2008) have provided evidence that an exponential model, using only the movement distance variable, may be more appropriate for modeling prehensile movements. Future studies are needed to explicitly investigate the utility of other such models in the design of 3D TUIs.…”