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Related Experiment Video

Updated: Feb 5, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Gaze when reaching to grasp a glass.

Dimitris Voudouris¹, Jeroen B J Smeets², Katja Fiehler¹

¹Experimental Psychology, Justus-Liebig University, Giessen, Germany.

Journal of Vision

|September 1, 2018

Summary

Grasping actions involve complex visual guidance. This study reveals that gaze during grasping is not solely determined by finger contact points but is also influenced by the location of subsequent object manipulation.

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Published on: December 16, 2010

Area of Science:

Neuroscience
Human Motor Control
Cognitive Psychology

Background:

Previous research indicates gaze fixation near the index finger's contact point during grasping.
Gaze shifts to the thumb's contact point have been observed when the index finger region is occluded, such as with opaque objects or specific grip types.

Purpose of the Study:

To investigate the influence of digit visibility and subsequent action location on gaze behavior during reaching and grasping tasks.
To determine if visual feedback of digit trajectories during the grasp influences gaze direction.

Main Methods:

Participants reached to grasp a glass at different heights (eye or hip) and poured its contents.
A second experiment involved grasping and placing/pouring objects with subsequent actions directed left or right.
Eye-tracking technology was used to monitor gaze patterns during these tasks.

Main Results:

Contrary to expectations, most participants fixated gaze nearer to the thumb's contact point.
Gaze showed some bias towards the location of the subsequent action, but this effect was inconsistent across participants and experiments.
Individual gaze patterns were not consistently influenced by object visibility or action context across trials.

Conclusions:

Gaze control during grasping is not solely dictated by the visibility of contact points or specific digit identities.
The location and nature of the subsequent manipulation significantly influence where individuals direct their gaze during the initial grasp.
Gaze behavior demonstrates flexibility, adapting to task demands beyond the immediate grasping phase.