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Related Experiment Video

Updated: Jun 1, 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

Grasping with the eyes.

Ettore Ambrosini1, Marcello Costantini, Corrado Sinigaglia

  • 1Laboratory of Neuropsychology and Cognitive Neuroscience, Department of Neuroscience and Imaging, University G. d'Annunzio, Milan, Italy.

Journal of Neurophysiology
|June 10, 2011
PubMed
Summary
This summary is machine-generated.

Observing hand shaping during an action helps people identify the target object faster. This suggests our motor system uses observed action cues for efficient visual target selection.

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

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Related Experiment Videos

Last Updated: Jun 1, 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

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

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

Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Visual Perception

Background:

  • Humans often observe actions in cluttered environments with multiple objects.
  • Understanding how observers select action targets is crucial for explaining social cognition.

Purpose of the Study:

  • To investigate if the brain can select an intended target among distractors based on observed actions.
  • To determine what information the motor system uses for target selection during action observation.

Main Methods:

  • Recorded participants' eye movements while they observed an actor reaching for and grasping one of two objects.
  • Compared conditions where the actor's hand preshaping indicated the grasp type versus a control condition with no hand preshaping.

Main Results:

  • Participants showed higher accuracy and earlier saccadic eye movements when observing hand preshaping for a grasp.
  • This effect occurred even when the action target was not previously known.
  • Hand preshaping provided sufficient motor cues for proactive and reliable saccade targeting.

Conclusions:

  • The observer's motor system uses hand preshaping cues to efficiently identify and target objects during action observation.
  • Findings support the direct matching hypothesis, indicating shared motor knowledge underlies action perception and execution.