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Updated: Mar 7, 2026

Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function

Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function

Published on: January 26, 2024

Different spatial representations guide eye and hand movements.

Matteo Lisi¹, Patrick Cavanagh²

¹Université Paris Descartes, Sorbonne Paris Cité, Paris, FranceCNRS (Laboratoire Psychologie de la Perception, UMR 8242), Paris, Francematteo_lisi@yahoo.it.

Journal of Vision

|March 1, 2017

Summary

This summary is machine-generated.

Saccadic eye movements target physical object locations, while hand movements are biased by perceived locations. This suggests distinct visual processing for different motor actions.

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Area of Science:

Neuroscience
Visual Perception
Motor Control

Background:

The visual system localizes objects for perception and action.
Previous research indicated differences in localizing moving objects between perception and saccadic eye movements.
It was unclear if this dissociation was specific to saccades or a general perception-action difference.

Purpose of the Study:

To investigate whether visual processing for saccadic eye movements differs from that for hand movements.
To determine if dissociations in object localization exist between different types of motor actions.

Main Methods:

Participants performed saccades and pointing movements toward brief targets presented on double-drift stimuli.
Double-drift stimuli created distortions in perceived location.
Pointing movements were also tested in open-loop conditions (without visual feedback of the hand).

Main Results:

Saccades accurately targeted the physical location of the stimuli.
Pointing movements showed a significant bias towards the perceived location of the stimuli (approximately 63% of the illusion).
This bias in pointing persisted even in open-loop conditions.

Conclusions:

There are dissociations in object localization between different motor actions, not just between perception and action.
Visual processing for saccadic eye movements is distinct from that supporting hand movements.
Spatial maps for saccades may rely on recent sensory signals, while perception and hand movements integrate signals over longer durations.