We present a skeletal linked model of the human hand that has natural motion. We show how this can be achieved by introducing a new biology-based joint axis that simulates natural joint motion and a set of constraints that reduce an estimated 150 possible motions to twelve. The model is based on observation and literature. To facilitate testing and evaluation, we present a simple low polygon count skin that can stretch and bulge. To evaluate we first introduce a hand-motion taxonomy in a twodimensional parameter space based on tasks that are evolutionary linked to the environment. Second, we discuss and test the model. The appendix shows motion sequences of the model and the real hand. Animations can be fetched from our website.
In the clinical community there is a need for assessment tools that allow for objective, quantitative and valid measures of motor dysfunction. In this paper, we report on the design and evaluation of a serious game that engages patients with Parkinson's disease in upper extremity (hand/arm) movements. The game employs augmented reality to show virtual movement targets, i.e. candies falling from a conveyor belt, and a haptic game controller to catch the candies, that is able to acquire quantitative data about the patient's movement. This paper first describes the design process of the game and the system components. Secondly, we present results of our small quantitative evaluation study (N=11, age: 26-60, healthy persons) regarding the usability of the system, the task load and user experience of the game. Our findings show that the system has a relatively good usability and the game is engaging, but there is still need for technical improvement with regard to tracking the controller in 3D space.
Young children with multiple disabilities (e.g., both cognitive and motor disabilities) are confronted with severe limitations in language development from birth and later on. Stimulating the adult-child communication can decrease these limitations. WithinLinguaBytes, a three-year research program, we try to stimulate language development by developing an interactive and adaptive play and learning environment, incorporating tangible objects and multimedia content, based on interactive storytelling and anchored instruction. The development of a product for such a heterogeneous user group presents substantial challenges. We use a Research-through-Design method, that is, an iterative process of developing subsequent experiential prototypes and then testing them in real-life settings, for example, a center for rehabilitation medicine. This article gives an outline of the development of theLinguaBytesplay and learning environment from the earliest studies up to the current prototype,CLICK-IT.
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