Virtual environments have great potential in applications such as entertainment, animation by example, design interface, information browsing, and even expressive performance. In this paper we describe an approach to unencumbered, natural interfaces called Perceptive Spaces with a particular focus on efforts to include true multi-modal interface: interfaces that attend to both the speech and ge...

Ever since Bolt’s seminal paper, ”Put that there: Voice and Gesture at the Graphics Interface”, the notion that multiple modes of input could be used to interact with computer applications has been an active area of human computer interaction research (Bolt 1980). This combiniation of different forms of input (e.g., speech, gesture, touch, eye gaze) is known as multimodal interaction and its go...

Natural Language interfaces to data bases and expert systems require the integration of several crucial capabilities in order to be judged h a b i t a b l e by their end users and p r o d u c t i v e by the developers of applications. User habitability is measured in terms of linguistic coverage, robustness of behavior and speed of response, whereas implementer productivity is measured by the a...

The gulf between user and system can be minimized by adapting the system to the user‘s natural characteristics. Socalled anthropomorphic interfaces represent one strategy of such an adaption as they are assumed to provide a more human-like and therefore more natural interaction. However, regarding the evaluation of anthropomorphic interfaces, the well-known and empirically tested instruments ar...