Reaching Within a Dynamic Virtual Environment

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

doi:10.1109/iwvr.2006.1707550

Cited by 7 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Viau et al (2004) showed that arm movement trajectories of both healthy subjects and individuals with mild hemiparesis following stroke were smooth and followed similar paths during reaching, grasping and placing a ball in both virtual and real physical environments. In accordance with these earlier studies, we have previously reported that subjects were able to reach toward all single- and double-step targets as well as to amend their ongoing movement in response to the unpredictable target displacement, while performing in the VE (Dvorkin et al 2007). Whereas similar behavior during a double-step task has been shown in the past for reaching within a stable VE (Martin et al 2003), we have now demonstrated that this holds true for both the still and dynamic scene conditions.…”

Section: Discussionsupporting

confidence: 86%

“…In a previous study with a small number of subjects we have described preliminary observations on the effect of roll visual motion on reaching, where subjects were exposed to an immersive 3D VE which was either matched to their head motion or rolled counterclockwise for a short time at a constant velocity (Dvorkin et al 2007). We have found that motion of the visual field mainly affected reaching toward a remembered target location.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of roll visual motion on online control of arm movement: reaching within a dynamic virtual environment

2008

View full text Add to dashboard Cite

Reaching toward a visual target involves the transformation of visual information into appropriate motor commands. Complex movements often occur either while we are moving or when objects in the world move around us, thus changing the spatial relationship between our hand and the space in which we plan to reach. This study investigated whether rotation of a wide field-of-view immersive scene produced by a virtual environment affected online visuomotor control during a double-step reaching task. A total of 20 seated healthy subjects reached for a visual target that remained stationary in space or unpredictably shifted to a second position (either to the right or left of its initial position) with different inter-stimulus intervals. Eleven subjects completed two experiments which were similar except for the duration of the target's appearance. The final target was either visible throughout the entire trial or only for a period of 200 ms. Movements were performed under two visual field conditions: the virtual scene was matched to the subject's head motion or rolled about the line of sight counterclockwise at 130°/s. Nine additional subjects completed a third experiment in which the direction of the rolling scene was manipulated (i.e., clockwise and counterclockwise). Our results showed that while all subjects were able to modify their hand trajectory in response to the target shift with both visual scenes, some of the double-step movements contained a pause prior to modifying trajectory direction. Furthermore, our findings indicated that both the timing and kinematic adjustments of the reach were affected by roll motion of the scene. Both planning and execution of the reach were affected by roll motion. Changes in proportion of trajectory types, and significantly longer pauses that occurred during the reach in the presence of roll motion suggest that background roll motion mainly interfered with the ability to update the visuomotor response to the target displacement. Furthermore, the reaching movement was affected differentially by the direction of roll motion. Subjects demonstrated a stronger effect of visual motion on movements taking place in the direction of visual roll (e.g., leftward movements during counterclockwise roll). Further investigation of the hand path revealed significant changes during roll motion for both the area and Correspondence to: Assaf Y. Dvorkin, a-dvorkin@northwestern.edusasaf@vms.huji.ac.il. shape of the 95% tolerance ellipses that were constructed from the hand position following the main movement termination. These changes corresponded with a hand drift that would suggest that subjects were relying more on proprioceptive information to estimate the arm position in space during roll motion of the visual field. We conclude that both the spatial and temporal kinematics of the reach movement were affected by the motion of the visual field, suggesting interference with the ability to simultaneously process two consecutive stimuli. NIH Public Access

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Effects of roll visual motion on online control of arm movement: reaching within a dynamic virtual environment

2008

View full text Add to dashboard Cite

show abstract

“…2.4.2 Remapped Input. Perception manipulation techniques have also been employed in selection-type tasks, where users' hands are retargeted to manipulate position and rotation to enable distantobject selection or to make selection more comfortable [18,20,[24][25][26]56]. These techniques are especially important when users are located in constrained spaces such as plane seats, where larger reaching motions may not be possible.…”

Section: Perception Manipulation Techniques Andmentioning

confidence: 99%

The Benefits of Passive Haptics and Perceptual Manipulation for Extended Reality Interactions in Constrained Passenger Spaces

Medeiros

Wilson

McGill

et al. 2023

Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems

View full text Add to dashboard Cite

show abstract

“…MacKenzie et al [23] investigated real time kinematics of limb movements in a Fitts' task and showed that, while Fitts' Law holds for the total limb-movement time, humans decelerate the motion sooner, if the target seems to require more precision in the end phase. The changes of the kinematics and control for reaching tasks within virtual environments have been investigated [14,38].…”

Section: D Mid-air Interaction Techniquesmentioning

confidence: 99%

To touch or not to touch?

Bruder

Steinicke²,

Stürzlinger

2013

Proceedings of the 1st Symposium on Spatial User Interaction

View full text Add to dashboard Cite

Recent developments in touch and display technologies have laid the groundwork to combine touch-sensitive display systems with stereoscopic three-dimensional (3D) display. Although this combination provides a compelling user experience, interaction with objects stereoscopically displayed in front of the screen poses some fundamental challenges: Traditionally, touch-sensitive surfaces capture only direct contacts such that the user has to penetrate the visually perceived object to touch the 2D surface behind the object. Conversely, recent technologies support capturing finger positions in front of the display, enabling users to interact with intangible objects in mid-air 3D space. In this paper we perform a comparison between such 2D touch and 3D mid-air interactions in a Fitts' Law experiment for objects with varying stereoscopical parallax. The results show that the 2D touch technique is more efficient close to the screen, whereas for targets further away from the screen, 3D selection outperforms 2D touch. Based on the results, we present implications for the design and development of future touch-sensitive interfaces for stereoscopic displays.

show abstract

Reaching Within a Dynamic Virtual Environment

Cited by 7 publications

References 16 publications

Effects of roll visual motion on online control of arm movement: reaching within a dynamic virtual environment

Effects of roll visual motion on online control of arm movement: reaching within a dynamic virtual environment

The Benefits of Passive Haptics and Perceptual Manipulation for Extended Reality Interactions in Constrained Passenger Spaces

To touch or not to touch?

Contact Info

Product

Resources

About