An action-concept processing advantage in a patient with a double motor cortex

Magdalena Miranda, Cecilia Gonzalez Campo, Agustina Birba, Alejandra Neely, Felipe Diego Toro-Hernández, Evelyng Faure, Gonzalo M. Rojas, Agustín Ibáñez, Adolfo García

Research output: Contribution to journalArticlepeer-review

Abstract

Patients with atrophy in motor brain regions exhibit selective deficits in processing action-related meanings, suggesting a link between movement conceptualization and the amount of regional tissue. Here we examine such a relation in a unique opposite model: a rare patient with a double cortex (due to subcortical band heterotopia) in primary/supplementary motor regions, and no double cortex in multimodal semantic regions. We measured behavioral performance in action- and object-concept processing as well and resting-state functional connectivity. Both dimensions involved comparisons with healthy controls. Results revealed preserved accuracy in action and object categories for the patient. However, unlike controls, the patient exhibited faster performance for action than object concepts, a difference that was uninfluenced by general cognitive abilities. Moreover, this pattern was accompanied by heightened functional connectivity between the bilateral primary motor cortices. This suggests that a functionally active double motor cortex may entail action-processing advantages. Our findings offer new constraints for models of action semantics and motor-region function at large.

Original languageEnglish
Article number105831
JournalBrain and Cognition
Volume156
DOIs
StatePublished - Feb 2022
Externally publishedYes

Keywords

  • Action semantics
  • Embodied cognition
  • Functional connectivity
  • Motor cortex
  • Subcortical band heterotopia

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