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Related Experiment Video

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

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

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.

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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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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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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
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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

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.