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Related Experiment Video

Updated: Jun 26, 2026

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

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Published on: April 21, 2023

Fixation locations when grasping partly occluded objects.

Denise D J de Grave1, Constanze Hesse, Anne-Marie Brouwer

  • 1Department of Experimental Psychology, Justus-Liebig-Universität Giessen, Germany. d.degrave@fbw.vu.nl

Journal of Vision
|January 17, 2009
PubMed
Summary
This summary is machine-generated.

When grasping objects, people look at occluded parts, using extrapolated information. Fixation preferences shift, particularly avoiding the index finger

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Motor Control

Background:

  • Grasping objects typically involves visual attention directed at digit contact points.
  • Visual occlusion of contact points presents a challenge for guiding grasping actions.
  • Previous research suggests potential strategies like extrapolation or avoidance of occluded areas.

Purpose of the Study:

  • To investigate visual fixation patterns during object grasping when contact points are occluded.
  • To determine if extrapolated information is used for grasping occluded objects.
  • To examine the influence of occlusion on preferred fixation locations.

Main Methods:

  • Participants grasped flat shapes using the index finger and thumb at predetermined contact positions.
  • Contact positions were systematically occluded for the thumb, index finger, or both.
  • A control condition involved occlusion of non-contact object areas.

Main Results:

  • Participants fixated on occluded object parts, indicating the use of extrapolated visual information for grasping.
  • A preference for fixating in the direction of the index finger was observed.
  • Occlusion of the index finger's contact position inhibited this fixation preference.

Conclusions:

  • Occlusion does not deter fixations on occluded object parts during grasping.
  • Extrapolated object information is utilized to guide actions towards occluded contact points.
  • Fixation behavior is modulated by occlusion, especially when preferred visual targets are obscured.