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Can skilled readers perform a second task in parallel? A functional connectivity MRI study.

Aaron J Newman1, Sophie Kenny, Jean Saint-Aubin

  • 1Departments of Psychology & Neuroscience, Psychiatry, Surgery, and Pediatrics (Division of Neurology), Dalhousie University, Halifax, Nova Scotia, Canada. Aaron.Newman@dal.ca

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Summary

Reading brain activation remains stable during concurrent letter-search tasks in skilled readers. This study validates a continuous neuroimaging approach for understanding the neural basis of language processing.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Psycholinguistics

Background:

  • The study of reading processes can be informed by analyzing errors in target-letter search tasks.
  • However, it remains unclear if such tasks accurately reflect normal reading.
  • This research addresses this question using a novel neuroimaging approach.

Purpose of the Study:

  • To investigate whether a concurrent letter-search task affects brain activation during reading.
  • To assess the validity of a continuous-performance neuroimaging paradigm for studying reading.
  • To explore the neural basis of language processing.

Main Methods:

  • A novel continuous-performance functional magnetic resonance imaging (fMRI) paradigm was employed.
  • Participants completed three conditions: reading alone, reading while searching for a target letter, and searching non-words.
  • Functional connectivity analysis was used to compare brain activation patterns across conditions.

Main Results:

  • Functional connectivity analysis successfully identified brain areas associated with reading, consistent with prior localizer scans.
  • No significant differences in brain activation were found between reading alone and the dual-task (reading + letter search) condition.
  • Distinct differences in brain activation were observed between reading conditions and the non-word search condition.

Conclusions:

  • In skilled readers, concurrent letter-search tasks do not alter brain activation associated with reading.
  • The findings support the utility of naturalistic, continuous-performance paradigms for investigating the neural underpinnings of language processing.
  • This study provides evidence for the robustness of reading networks under dual-task demands.