Psychophysical experiments in a complex virtual environment

摘要: We are using two PHANToM 3.0 force feedback devices in one workspace order to perform studies of one-hand precision grip tasks or handed pointing tasks. The visual environment is rendered by an Onyx workstation and presented a specialized stereo head mounted display that allows eye tracking. position orientation tracked with electromagnetic system (Fastrak). Together, these systems allow the current gaze direction world coordinates be computed real time. artificial haptic may contain free movable objects as well stationary parts, whereas can complex simple. graphical user interface all object properties changed online. In addition, we programmable effects depend on velocity information. Psychophysical experiments simulate eye-hand coordination 3D scenes demonstrate results seem line previous research environments. Thus, believe dual-PHANToM instrument experimental device suited for various motor coordination, special reference aspects like timing adaptation. keywords: human experiments: psychophysics, vision, sensori-motor control; virtual reality 1 Virtual Reality Setup National Institute Health (NIH) Lab integrates several co-located many coordination. Devices displays (HMD) trackers (Fastrak, Polhemus Inc) used present scene subjects, which they interact (PHANToM, SensAble Technologies, Inc.). All integrated flexible setup, their physical controlled experimenter. program controlling presentations subjects online control over parameters concerning devices. simulation runs Infinite machine (Silicon Graphics, rendering interactions same computer minimize latency simulation. 1.1 designed have acting dimension 30x40x40 cm. face each other, epoxy blocks situated table (Fig. 1). A crucial setup problem achieve exact alignment workspaces PHANToMs. Each needs calibrated precise location shared three dimensional workspace. Through careful calibration mounting optimal starting (90 degree angles) arms, achieved error below mm average between point space