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Functional Mapping of Inner Speech Areas: A Preliminary Study with Portuguese Speakers

  • Carlos Ferreira
  • Bruno Direito
  • Alexandre Sayal
  • Marco Simões
  • Inês Cadório
  • Paula Martins
  • Marisa Lousada
  • Daniela Figueiredo
  • Miguel Castelo-Branco
  • António TeixeiraEmail author
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11096)

Abstract

Inner speech can be defined as the act of talking silently with ourselves. Several studies aimed to understand how this process is related to speech organization and language. Despite the advances, some results are still contradictory. Importantly, language dependency is scarcely studied. For this first study of inner speech for Portuguese native speakers using fMRI, we selected a confrontation naming task, consisting of 40 black and white line drawings. Five healthy participants were instructed to name in inner and in overt speech the visually presented image. fMRI data analysis considering the proposed inner speech paradigm identified several brain areas such as the left inferior frontal gyrus, including Broca’s area, supplementary motor area, precentral gyrus and left middle temporal gyrus including Wernicke’s area. Our results also show more pronounced bilateral activations during the overt speech task when compared to inner speech, suggesting that inner and overt speech activate similar areas but stronger activation can be found in the later. However, this difference stems in particular from significant activation differences in the right pre-central gyrus and middle temporal gyrus.

Keywords

Inner speech portuguese First keyword Overt speech fMRI Portuguese 

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Institute of Nuclear Sciences Applied to HealthUniversity of CoimbraCoimbraPortugal
  2. 2.CIBIT Coimbra Institute for Biomedical Imaging and Translational Research, ICNASUniversity of CoimbraCoimbraPortugal
  3. 3.Faculty of MedicineUniversity of CoimbraCoimbraPortugal
  4. 4.Center for Informatics and SystemsUniversity of CoimbraCoimbraPortugal
  5. 5.School of Health SciencesUniversity of AveiroAveiroPortugal
  6. 6.Center for Health Technology and Services ResearchUniversity of AveiroAveiroPortugal
  7. 7.Institute of BiomedicineUniversity of AveiroAveiroPortugal
  8. 8.Institute of Electronics and Telematics Engineering of Aveiro (IEETA)AveiroPortugal
  9. 9.Department of Electronics, Telecommunications and InformaticsUniversity of AveiroAveiroPortugal
  10. 10.Perspectum DiagnosticsOxfordUK

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