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Related Experiment Video

Updated: May 16, 2026

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

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Gaze strategies during visually-guided versus memory-guided grasping.

Steven L Prime1, Jonathan J Marotta

  • 1School of Psychology, Victoria University of Wellington, Wellington, New Zealand. steven.prime@vuw.ac.nz

Experimental Brain Research
|December 15, 2012
PubMed
Summary
This summary is machine-generated.

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When reaching for objects without sight, people gaze at the object's center. Visually guided grasping, however, directs gaze to the finger's grasp point, supporting the two-stream theory of vision.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • Vision is critical for guiding motor actions, but actions can also be guided by memory when vision is unavailable.
  • Previous research indicates gaze fixation on the index finger's grasp position during visually-guided grasping.

Purpose of the Study:

  • To investigate gaze behavior during memory-guided grasping compared to visually-guided grasping.
  • To explore how the brain processes visual information for action planning under different feedback conditions.

Main Methods:

  • Subjects performed grasping tasks under visually-guided and memory-guided conditions (Experiment 1).
  • An immediate grasping task with vision removal at reach onset was also conducted (Experiment 2).
  • Gaze behavior was recorded throughout the grasping tasks.

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Related Experiment Videos

Last Updated: May 16, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
10:51

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

Published on: January 15, 2018

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

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

Published on: April 21, 2023

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Main Results:

  • During visually-guided grasping, gaze initially targeted the index finger's grasp point.
  • During memory-guided grasping, gaze was directed towards the block's center of mass.
  • In immediate grasping, gaze also focused on the index finger's location.

Conclusions:

  • Gaze direction differs significantly between visually-guided and memory-guided grasping.
  • Visually-guided actions rely on the dorsal stream for real-time visuomotor control.
  • Memory-guided actions are mediated by the ventral stream's perceptual memory representations.