Abstract
Virtual Environments (VEs) can be used as a tool for the analysis of mental parameters as well as for therapy of special mental disorders. The framework allows the rapid development of virtual environments for scientific psychological experiments. It consists of configurable modules for any type of visualization device, including head mounted display, stereo wall projection, and CAVE. Other modules provide basic interaction methods such as navigation and object selection. The interaction methods are not dependent on specific hardware devices. For the postanalysis of experiments, the framework includes a database that stores all movements and interactions of the users. A playback function shows all parameters of a session including the resulting changes in the VE. Additionally, all interactions can be transmitted via serial connection or internet to external analysis equipment. Because medical measurement tools provide the same protocols, the interaction data can be easily co-related with heart rate, blood pressure, EEG, or other variables. The design of specific applications is supported by an interpreted scripting language (TCL). Using the object oriented extension [incrTcl], typical applications can be described in a very compact form. Beyond 3D interaction methods, the framework supports the fast-application, specific development of graphical user interfaces (GUI). The GUIs are used to enable the psychiatrist to control all parameters of the application. The GUI and the VE are independent applications and communicate via an internet protocol.
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