Cited by 58Action Observation and SynchronizationTranscranial Magnetic Stimulation StudiesMotor Control and Adaptation

Modulation of motor cortex excitability by physical similarity with an observed hand action

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Désy, Marie-Christine, Théoret, Hugo·2007·PLoS ONE

Abstract

The passive observation of hand actions is associated with increased motor cortex excitability, presumably reflecting activity within the human mirror neuron system (MNS). Recent data show that in-group ethnic membership increases motor cortex excitability during observation of culturally relevant hand gestures, suggesting that physical similarity with an observed body part may modulate MNS responses. Here, we ask whether the MNS is preferentially activated by passive observation of hand actions that are similar or dissimilar to self in terms of sex and skin color. Transcranial magnetic stimulation-induced motor evoked potentials were recorded from the first dorsal interosseus muscle while participants viewed videos depicting index finger movements made by female or male participants with black or white skin color. Forty-eight participants equally distributed in terms of sex and skin color participated in the study. Results show an interaction between self-attributes and physical attributes of the observed hand in the right motor cortex of female participants, where corticospinal excitability is increased during observation of hand actions in a different skin color than that of the observer. Our data show that specific physical properties of an observed action modulate motor cortex excitability and we hypothesize that in-group/out-group membership and self-related processes underlie these effects.

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Crossref · 10.1371/journal.pone.0000971

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  • Participants show reduced vicarious activation of the motor cortex when observing actions performed by a racial outgroup member compared to an ingroup member, and show decreased neural and motor responses when viewing racial outgroup members in pain.

    “In the motor domain, participants show reduced vicarious activation of the motor cortex when observing actions performed by a racial outgroup member as compared to an ingroup member [4,8], and show decreased neural and motor responses when viewing racial outgroup members in pain [3,6].”

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Authors
Désy, M.-C., & Théoret, H.
Affiliations
Centre Hospitalier Universitaire Sainte-Justine (CA)
Corresponding author
Théoret, Hugo
Venue
PLoS ONE
Published
2007-10-03
Volume
2
Issue
10
Pages
e971
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1968420580
Cited by
57
References
47
Citations by year
2025: 2 · 2024: 2 · 2023: 2 · 2021: 2 · 2019: 2 · 2018: 2 · 2017: 4 · 2016: 7 · 2015: 2 · 2014: 6 · 2013: 6 · 2012: 8
FWCI
4.12
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Social Sciences › Psychology › Social Psychology › Action Observation and Synchronization
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
Keywords
mirror neuron system, motor cortex excitability, corticospinal excitability, physical similarity, skin color, sex differences, self-referential processing, in-group membership, first dorsal interosseous muscle, motor evoked potentials
MeSH terms
Adolescent, Adult, Female, Hand, Humans, Male, Motor Cortex, Movement, Psychomotor Performance, Sex Factors, Evoked Potentials, Motor, Black People, White People, Transcranial Magnetic Stimulation, Cerebrum

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