Dopamine drives left-hemispheric lateralization of neural networks during human speech

Stefan Fuertinger, Joel C. Zinn, Ashwini D. Sharan, Farid Hamzei-Sichani, Kristina Simonyan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Although the concept of left-hemispheric lateralization of neural processes during speech production has been known since the times of Broca, its physiological underpinnings still remain elusive. We sought to assess the modulatory influences of a major neurotransmitter, dopamine, on hemispheric lateralization during real-life speaking using a multimodal analysis of functional MRI, intracranial EEG recordings, and large-scale neural population simulations based on diffusion-weighted MRI. We demonstrate that speech-induced phasic dopamine release into the dorsal striatum and speech motor cortex exerts direct modulation of neuronal activity in these regions and drives left-hemispheric lateralization of speech production network. Dopamine-induced lateralization of functional activity and networks during speaking is not dependent on lateralization of structural nigro-striatal and nigro-motocortical pathways. Our findings provide the first mechanistic explanation for left-hemispheric lateralization of human speech that is due to left-lateralized dopaminergic modulation of brain activity and functional networks.

Original languageEnglish
Pages (from-to)920-931
Number of pages12
JournalJournal of Comparative Neurology
Volume526
Issue number5
DOIs
StatePublished - 1 Apr 2018
Externally publishedYes

Keywords

  • fMRI
  • hemispheric lateralization
  • iEEG
  • neural modeling
  • speech production

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