Investigations on the interactions between vision and locomotion using a treadmill virtual environment

Treadmill-based virtual environments have the potential to allow near natural locomotion through large-scale simulated spaces. To be effective, such devices need to provide users with visual and biomechanical sensations of walking that are sufficiently accurate to evoke perception-action couplings comparable to those occurring in the real world. We are exploring this problem using a custom built, computer controlled treadmill with a 6' by 10' walking surface, coupled to computer graphics presented on wide field-of-view back projection screens. The system has the added feature of being able to apply forces to the user to simulate walking on slopes and the effects of changes in walking speed. We have demonstrated the effectiveness of this system by showing that the perceptual-motor calibration of human locomotion in the real world can be altered by prior walking on the treadmill virtual environment when the visual flow associated with self-motion is mismatched relative to biomechanical walking speed. The perceptual-motor coupling that we have achieved is sufficient to allow investigation of a number of open questions, including the effect of walking on slopes on the visual estimation of slant and visual influences on gait and walking speed.

[1]  Sarah H. Creem-Regehr,et al.  Perceiving virtual geographical slant: action influences perception. , 2004, Journal of experimental psychology. Human perception and performance.

[2]  Dennis R. Proffitt,et al.  Two memories for geographical slant: Separation and interdependence of action and awareness , 1998, Psychonomic bulletin & review.

[3]  Wallace J. Sadowski,et al.  Nonvisually Guided Locomotion to a Previously Viewed Target in Real and Virtual Environments , 1998, Hum. Factors.

[4]  Rich Gossweiler,et al.  Perceiving geographical slant , 1995, Psychonomic bulletin & review.

[5]  John P. Lewis,et al.  Perceptuomotor adaptation: more than meets the eye , 2002 .

[6]  Jeanine K. Stefanucci,et al.  The Role of Effort in Perceiving Distance , 2003, Psychological science.

[7]  Sarah S. Chance,et al.  Spatial Updating of Self-Position and Orientation During Real, Imagined, and Virtual Locomotion , 1998 .

[8]  John M. Hollerbach,et al.  Design Specifications for the Second Generation Sarcos Treadport Locomotion Interface , 2000, Dynamic Systems and Control: Volume 2.

[9]  W. H. Warren,et al.  Why change gaits? Dynamics of the walk-run transition. , 1995, Journal of experimental psychology. Human perception and performance.

[10]  W. Warren,et al.  The dynamics of gait transitions: effects of grade and load. , 1998, Journal of motor behavior.

[11]  J. Rieser,et al.  Visual Perception and the Guidance of Locomotion without Vision to Previously Seen Targets , 1990, Perception.

[12]  Krista M. Gigone,et al.  Perception of visual speed while moving. , 2005, Journal of experimental psychology. Human perception and performance.

[13]  Bruce A. Kay,et al.  Coupling of posture and gait: mode locking and parametric excitation , 2001, Biological Cybernetics.

[14]  J. Loomis,et al.  Visual space perception and visually directed action. , 1992 .

[15]  Jack M. Loomis,et al.  Visual perception of egocentric distance in real and virtual environments. , 2003 .

[16]  B A Kay,et al.  Visual control of posture during walking: functional specificity. , 1996, Journal of experimental psychology. Human perception and performance.

[17]  Karl M. Newell,et al.  Attentional focus influences the walk–run transition in human locomotion , 2003, Biological Psychology.

[18]  D. Proffitt,et al.  Visual-motor recalibration in geographical slant perception. , 1999, Journal of experimental psychology. Human perception and performance.

[19]  Thomas Banton,et al.  The Perception of Walking Speed in a Virtual Environment , 2005, Presence: Teleoperators & Virtual Environments.

[20]  Peter Willemsen,et al.  Does the Quality of the Computer Graphics Matter when Judging Distances in Visually Immersive Environments? , 2004, Presence: Teleoperators & Virtual Environments.

[21]  A Hreljac,et al.  Preferred and energetically optimal gait transition speeds in human locomotion. , 1993, Medicine and science in sports and exercise.

[22]  Tsutomu Miyasato,et al.  Development of Ground Surface Simulator for Tel-E-Merge system , 2000, Proceedings IEEE Virtual Reality 2000 (Cat. No.00CB37048).

[23]  Rudy Darken,et al.  The omni-directional treadmill: a locomotion device for virtual worlds , 1997, UIST '97.

[24]  Hiroo Iwata,et al.  Path Reproduction Tests Using a Torus Treadmill , 1999, Presence.

[25]  J. Loomis,et al.  Visual space perception and visually directed action. , 1992, Journal of experimental psychology. Human perception and performance.

[26]  Anne E. Garing,et al.  Calibration of human locomotion and models of perceptual-motor organization. , 1995, Journal of experimental psychology. Human perception and performance.

[27]  A. Minetti,et al.  The transition between walking and running in humans: metabolic and mechanical aspects at different gradients. , 1994, Acta physiologica Scandinavica.

[28]  Wendy D. Zosh,et al.  Seeing Mountains in Mole Hills: Geographical-Slant Perception , 2001, Psychological science.

[29]  Jack M. Loomis,et al.  Locomotion Mode Affects the Updating of Objects Encountered During Travel: The Contribution of Vestibular and Proprioceptive Inputs to Path Integration , 1998, Presence.

[30]  K. M. Newell,et al.  Perceived task expectations and the walk-run gait transition , 2002 .

[31]  John M. Hollerbach,et al.  Torso Force Feedback Realistically Simulates Slope on Treadmill-Style Locomotion Interfaces , 2001, Int. J. Robotics Res..