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Related Experiment Video

Updated: Jun 24, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Lesions to the motor system affect action perception.

Andrea Serino¹, Laura De Filippo, Chiara Casavecchia

¹Università degli Studi di Bologna, Bologna, Italy. andrea.serino@unibo.it

Journal of Cognitive Neuroscience

|March 24, 2009

Summary

Motor cortex impairment hinders action perception. Patients with hemiplegia showed reduced ability to recognize arm gestures, especially when viewed from the perspective of their affected limb.

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Area of Science:

Neuroscience
Cognitive Psychology
Motor Control

Background:

Action perception is increasingly linked to the motor system, suggesting sensory-motor processes underlie action concept representation.
This connection implies that damage to the motor system could impair an individual's ability to perceive actions.

Purpose of the Study:

To investigate the hypothesis that motor system impairments diminish action perception.
To determine if lesions in the motor system specifically affect the ability to recognize observed arm gestures.

Main Methods:

10 patients with hemiplegia (motor system lesion affecting one arm) viewed point-light displays of arm gestures.
Stimuli were created from gestures performed by the patients' unaffected arm and presented in both natural and mirror-reversed orientations.
Action recognition accuracy was compared between hemiplegic patients, non-hemiplegic brain-damaged patients, and healthy controls.

Main Results:

Overall, control observers outperformed patients in action recognition.
Hemiplegic patients' performance varied significantly based on the observed limb's orientation.
Recognition was best for actions appearing to originate from the unaffected arm and significantly worse for actions associated with the hemiplegic arm.

Conclusions:

Motor cortex impairment reduces visual sensitivity to human actions.
When an individual cannot perform an action due to a cortical lesion, their perception of that action is compromised.
This deficit may stem from a failure to map observed actions onto the observer's own body representation, particularly the contralesional side.