Reaching within a dynamic virtual environment

Assaf Y. Dvorkin, Robert V. Kenyon, Emily A. Keshner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Planning and execution of reaching movements requires a series of computational processes that involves the localization of both the target and initial arm position, and the translation of this spatial information into appropriate motor commands that will bring the hand to the target Voluntary and/or involuntary changes in the spatial relationship between our hand and the space in which we plan to reach may occur at any time. In the current study we investigated the effects of shifting both the central and peripheral visual field on visuomotor control using a virtual visual environment In two separate experiments, six seated healthy subjects were exposed to either stationary or roll motion of a 3D virtual scene while reaching for a visual target that remained stationary in space or unexpectedly shifted to a second position with different inter-stimulus intervals. Our initial results suggest that both temporal and spatial aspects of the reaching movement were affected by roll of the visual field. Whereas the results indicate that subjects were able to amend their ongoing motion to match the target position with both scene conditions, the presence of peripheral visual field motion produced significantly longer pauses during the reach movement when the target shifted in space. We conclude from this that motion in the peripheral field of view interfered with the ability to simultaneously process two consecutive stimuli. The terminal arm posture also exhibited a drift in the direction opposite to the roll motion suggesting that subjects were compensating for a perceived change in their visual reference frame.

Original languageEnglish (US)
Title of host publicationFifth International Workshop on Virtual Rehabilitation, IWVR 2006
PublisherIEEE Computer Society
Pages182-186
Number of pages5
ISBN (Print)1424402808, 9781424402809
DOIs
StatePublished - Jan 1 2006
Event5th International Workshop on Virtual Rehabilitation, IWVR 2006 - New York, NY, United States
Duration: Aug 29 2006Aug 30 2006

Publication series

NameFifth International Workshop on Virtual Rehabilitation, IWVR 2006

Other

Other5th International Workshop on Virtual Rehabilitation, IWVR 2006
CountryUnited States
CityNew York, NY
Period8/29/068/30/06

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Vision and Pattern Recognition
  • Software
  • Rehabilitation

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