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Related Experiment Video

Updated: Jul 11, 2026

Eye Tracking During Visually Situated Language Comprehension: Flexibility and Limitations in Uncovering Visual Context Effects

Eye Tracking During Visually Situated Language Comprehension: Flexibility and Limitations in Uncovering Visual Context Effects

Published on: November 30, 2018

No language-specific activation during linguistic processing of observed actions.

Ingo G Meister¹, Marco Iacoboni

¹Ahmanson-Lovelace Brain Mapping Center, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California, United States of America. igmeister@gmx.de

|September 13, 2007

Summary

Language processing evolved from action observation networks in the brain. Linguistic tasks activate subsets of these fronto-parietal areas, supporting the exaptation hypothesis for language evolution.

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Corticospinal Excitability Modulation During Action Observation

Corticospinal Excitability Modulation During Action Observation

Published on: December 31, 2013

Area of Science:

Neuroscience
Cognitive Science
Evolutionary Biology

Background:

Cortical language systems may have evolved from motor systems, specifically fronto-parietal areas involved in action observation.
Previous research indicated shared neural systems for action observation and language, but didn't pinpoint if language processing is confined to a subset of these areas.

Purpose of the Study:

To investigate whether linguistic processing of visual stimuli occurs exclusively within the fronto-parietal network activated by action observation.
To test the hypothesis that language evolved from fronto-parietal systems matching action execution and observation.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to monitor brain activity in subjects.
Participants viewed videos of hand-object interactions and static object images.
Tasks included linguistic (conceptual, phonological) and perceptual processing of the stimuli.

Main Results:

Linguistic tasks activated left inferior frontal areas, which were subsets of a larger bilateral fronto-parietal network active during action perception.
No cortical area showed exclusive or higher activation for linguistic tasks compared to action perception.

Conclusions:

Linguistic tasks activate a subset of the action observation network when identical stimuli are used, indicating shared neural representations.
Findings strongly support the evolutionary hypothesis of exaptation, where fronto-parietal action systems were co-opted for language development.