Journal
BRAIN AND LANGUAGE
Volume 231, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bl.2022.105146
Keywords
Functional MRI; Tractography; Diffusion MRI; Multimodal neuroimaging; Picture naming
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [418630-2012]
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We mapped the cortical regions and fiber bundles involved in picture naming in adults by integrating task-based fMRI with dMRI tractography. We identified a ventral pathway that maps image and sound to meaning, and a dorsal pathway that maps sound to speech. We also identified the specific brain regions and fiber bundles involved in these pathways.
We mapped the left hemisphere cortical regions and fiber bundles involved in picture naming in adults by integrating task-based fMRI with dMRI tractography.We showed that a ventral pathway that maps image and sound to meaning involves the middle occipital, inferior temporal, superior temporal, inferior frontal gyri, and the temporal pole where a signal exchange is made possible by the inferior fronto-occipital, inferior longitudinal, middle longitudinal, uncinate fasciculi, and the extreme capsule.A dorsal pathway that maps sound to speech implicates the inferior temporal, superior temporal, inferior frontal, precentral gyri, and the supplementary motor area where the arcuate fasciculus and the frontal aslant ensure intercommunication. This study provides a neurocognitive model of picture naming and supports the hypothesis that the ventral indirect route passes through the temporal pole.This further supports the idea that the inferior and superior temporal gyri may play pivotal roles within the dual-stream framework of language.
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