Cited by 90Transcranial Magnetic Stimulation StudiesNeurobiology of Language and BilingualismStuttering Research and Treatment

Covert speech arrest induced by rTMS over both motor and nonmotor left hemisphere frontal sites

Aziz-Zadeh, Lisa, Cattaneo, Luigi, Rochat, Magali, Rizzolatti, Giacomo·2005·Journal of Cognitive Neuroscience

Abstract

Blocking the capacity to speak aloud (overt speech arrest, SA) may be induced by repetitive transcranial magnetic stimulation (rTMS). The possibility, however, of blocking internal speech (covert SA) has not been explored. To investigate this issue, we conducted two rTMS experiments. In the first experiment, we stimulated two left frontal lobe sites. The first was a motor site (left posterior site) and the second was a nonmotor site located in correspondence to the posterior part of the inferior frontal gyrus (IFG) (left anterior site). The corresponding right hemisphere nonmotor SA site was stimulated as a control. In the second experiment, we focused on the right hemisphere and stimulated a right hemisphere motor site (right posterior site), and, as control sites, a right hemisphere nonmotor site corresponding to the IFG (right anterior site) and a left hemisphere anteromedial site (left control). For both experiments, participants performed a syllable counting task both covertly and overtly for each stimulation site. Longer latencies in this task imply the occurrence of an overt and/or covert SA. All participants showed significantly longer latencies when stimulation was either over the left posterior or the left anterior site, as compared with the right hemisphere site (Experiment 1). This result was observed for the overt and covert speech task alike. During stimulation of the posterior right hemisphere site, a dissociation for overt and covert speech was observed. An overt SA was observed but there was no evidence for a covert SA (Experiment 2). Taken together, the results show that rTMS can induce a covert SA when applied to areas over the brain that are pertinent to language. Furthermore, both the left posterior/motor site and the left anterior/IFG site appear to be essential to language elaboration even when motor output is not required.

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Crossref · 10.1162/0898929054021157

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Authors
Aziz-Zadeh, L., Cattaneo, L., Rochat, M., & Rizzolatti, G.
Affiliations
  • Università di Parma, Italy
  • University of Parma (IT)
Venue
Journal of Cognitive Neuroscience
Publisher
MIT Press
Published
2005-06-01
Volume
17
Issue
6
Pages
928-938
ISSN
  • 0898-929X (ISSN-L)
  • 1530-8898
OpenAlex
W2158857109
Cited by
90
References
51
Citations by year
2026: 1 · 2025: 2 · 2024: 7 · 2023: 2 · 2022: 2 · 2021: 9 · 2020: 1 · 2019: 6 · 2018: 3 · 2017: 4 · 2016: 2 · 2015: 3 · 2014: 6 · 2013: 4 · 2012: 11
FWCI
3.39
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Cognitive Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Iris (University of Trento) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Neurology › Transcranial Magnetic Stimulation Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
  • Social Sciences › Psychology › Clinical Psychology › Stuttering Research and Treatment
Keywords
inner speech, repetitive transcranial magnetic stimulation, left hemisphere, inferior frontal gyrus, motor cortex, language processing, syllable counting, hemispheric lateralization
MeSH terms
Adult, Cerebral Cortex, Electric Stimulation, Electromagnetic Fields, Female, Humans, Language, Functional Laterality, Male, Motor Cortex, Movement, Reaction Time, Reference Values, Speech, Thinking

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