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Updated: May 19, 2026

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

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

Published on: April 21, 2023

Do humans prefer to see their grasping points?

D Voudouris¹, J B J Smeets, E Brenner

¹Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands. d.voudouris@vu.nl

Journal of Motor Behavior

|August 4, 2012

Summary

Humans do not prioritize seeing their grasping points when reaching for objects. Even when vision of the thumb

Area of Science:

Human motor control
Robotics
Biomechanics

Background:

Successful object manipulation requires precise placement of digits on grasping points.
Grasping point selection is influenced by various factors, including visual feedback.

Purpose of the Study:

To investigate whether maintaining visual contact with grasping points influences grip selection during object manipulation.
To determine if humans adjust their grip strategy to keep the thumb's grasping point visible.

Main Methods:

Participants grasped objects (cylinders, blocks) under normal conditions and with their thumb's grasping point occluded by an opaque screen.
A transparent screen served as a control condition.
Grip aperture and orientation were analyzed to assess changes in grasping strategy.

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Main Results:

Occluding the thumb's grasping point led to more cautious movements, characterized by a larger grip aperture.
A slight alteration in grip orientation was observed, but it was insufficient to maintain thumb visibility.
The primary grasping point remained largely unchanged despite the visual occlusion.

Conclusions:

Humans do not actively alter their grasping strategy to ensure the visibility of key grasping points, such as the thumb.
Visual feedback of the grasping point is not a primary determinant in grip selection for object manipulation.
Motor control strategies prioritize functional grip formation over maintaining continuous visual contact with all grasping points.