On-line visual control of grasping movements

Robert Volcic, Fulvio Domini

Research output: Contribution to journalArticle

Abstract

Even though it is recognized that vision plays an important role in grasping movements, it is not yet fully understood how the visual feedback of the hand contributes to the on-line control. Visual feedback could be used to shape the posture of the hand and fingers, to adjust the trajectory of the moving hand, or a combination of both. Here, we used a dynamic perturbation method that altered the position of the visual feedback relative to the actual position of the thumb and index finger to virtually increase or decrease the visually sensed grip aperture. Subjects grasped objects in a virtual 3D environment with haptic feedback and with visual feedback provided by small virtual spheres anchored to the their unseen fingertips. We found that the effects of the visually perturbed grip aperture arose preeminently late in the movement when the hand was in the object’s proximity. The on-line visual feedback assisted both the scaling of the grip aperture to properly conform it to the object’s dimension and the transport of the hand to correctly position the digits on the object’s surface. However, the extent of these compensatory adjustments was contingent on the viewing geometry. The visual control of the actual grip aperture was mainly observed when the final grasp axis orientation was approximately perpendicular to the viewing direction. On the contrary, when the final grasp axis was aligned with the viewing direction, the visual control was predominantly concerned with the guidance of the digit toward the visible final contact point.

Original languageEnglish (US)
Pages (from-to)2165-2177
Number of pages13
JournalExperimental Brain Research
Volume234
Issue number8
DOIs
StatePublished - Aug 1 2016

Fingerprint

Hand Strength
Sensory Feedback
Hand
Fingers
Social Adjustment
Thumb
Posture

Keywords

  • Grasping
  • On-line control
  • Perturbation
  • Virtual reality
  • Visual feedback

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

On-line visual control of grasping movements. / Volcic, Robert; Domini, Fulvio.

In: Experimental Brain Research, Vol. 234, No. 8, 01.08.2016, p. 2165-2177.

Research output: Contribution to journalArticle

Volcic, Robert ; Domini, Fulvio. / On-line visual control of grasping movements. In: Experimental Brain Research. 2016 ; Vol. 234, No. 8. pp. 2165-2177.
@article{03cfce283f4d4b65be76c676e95cc298,
title = "On-line visual control of grasping movements",
abstract = "Even though it is recognized that vision plays an important role in grasping movements, it is not yet fully understood how the visual feedback of the hand contributes to the on-line control. Visual feedback could be used to shape the posture of the hand and fingers, to adjust the trajectory of the moving hand, or a combination of both. Here, we used a dynamic perturbation method that altered the position of the visual feedback relative to the actual position of the thumb and index finger to virtually increase or decrease the visually sensed grip aperture. Subjects grasped objects in a virtual 3D environment with haptic feedback and with visual feedback provided by small virtual spheres anchored to the their unseen fingertips. We found that the effects of the visually perturbed grip aperture arose preeminently late in the movement when the hand was in the object’s proximity. The on-line visual feedback assisted both the scaling of the grip aperture to properly conform it to the object’s dimension and the transport of the hand to correctly position the digits on the object’s surface. However, the extent of these compensatory adjustments was contingent on the viewing geometry. The visual control of the actual grip aperture was mainly observed when the final grasp axis orientation was approximately perpendicular to the viewing direction. On the contrary, when the final grasp axis was aligned with the viewing direction, the visual control was predominantly concerned with the guidance of the digit toward the visible final contact point.",
keywords = "Grasping, On-line control, Perturbation, Virtual reality, Visual feedback",
author = "Robert Volcic and Fulvio Domini",
year = "2016",
month = "8",
day = "1",
doi = "10.1007/s00221-016-4620-x",
language = "English (US)",
volume = "234",
pages = "2165--2177",
journal = "Experimental Brain Research",
issn = "0014-4819",
publisher = "Springer Verlag",
number = "8",

}

TY - JOUR

T1 - On-line visual control of grasping movements

AU - Volcic, Robert

AU - Domini, Fulvio

PY - 2016/8/1

Y1 - 2016/8/1

N2 - Even though it is recognized that vision plays an important role in grasping movements, it is not yet fully understood how the visual feedback of the hand contributes to the on-line control. Visual feedback could be used to shape the posture of the hand and fingers, to adjust the trajectory of the moving hand, or a combination of both. Here, we used a dynamic perturbation method that altered the position of the visual feedback relative to the actual position of the thumb and index finger to virtually increase or decrease the visually sensed grip aperture. Subjects grasped objects in a virtual 3D environment with haptic feedback and with visual feedback provided by small virtual spheres anchored to the their unseen fingertips. We found that the effects of the visually perturbed grip aperture arose preeminently late in the movement when the hand was in the object’s proximity. The on-line visual feedback assisted both the scaling of the grip aperture to properly conform it to the object’s dimension and the transport of the hand to correctly position the digits on the object’s surface. However, the extent of these compensatory adjustments was contingent on the viewing geometry. The visual control of the actual grip aperture was mainly observed when the final grasp axis orientation was approximately perpendicular to the viewing direction. On the contrary, when the final grasp axis was aligned with the viewing direction, the visual control was predominantly concerned with the guidance of the digit toward the visible final contact point.

AB - Even though it is recognized that vision plays an important role in grasping movements, it is not yet fully understood how the visual feedback of the hand contributes to the on-line control. Visual feedback could be used to shape the posture of the hand and fingers, to adjust the trajectory of the moving hand, or a combination of both. Here, we used a dynamic perturbation method that altered the position of the visual feedback relative to the actual position of the thumb and index finger to virtually increase or decrease the visually sensed grip aperture. Subjects grasped objects in a virtual 3D environment with haptic feedback and with visual feedback provided by small virtual spheres anchored to the their unseen fingertips. We found that the effects of the visually perturbed grip aperture arose preeminently late in the movement when the hand was in the object’s proximity. The on-line visual feedback assisted both the scaling of the grip aperture to properly conform it to the object’s dimension and the transport of the hand to correctly position the digits on the object’s surface. However, the extent of these compensatory adjustments was contingent on the viewing geometry. The visual control of the actual grip aperture was mainly observed when the final grasp axis orientation was approximately perpendicular to the viewing direction. On the contrary, when the final grasp axis was aligned with the viewing direction, the visual control was predominantly concerned with the guidance of the digit toward the visible final contact point.

KW - Grasping

KW - On-line control

KW - Perturbation

KW - Virtual reality

KW - Visual feedback

UR - http://www.scopus.com/inward/record.url?scp=84961248559&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84961248559&partnerID=8YFLogxK

U2 - 10.1007/s00221-016-4620-x

DO - 10.1007/s00221-016-4620-x

M3 - Article

C2 - 26996387

AN - SCOPUS:84961248559

VL - 234

SP - 2165

EP - 2177

JO - Experimental Brain Research

JF - Experimental Brain Research

SN - 0014-4819

IS - 8

ER -