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Buchweitz, 2009, Brain activation for reading and listening comprehension

Buchweitz A, Mason RA, Tomitch LM, Just MA. Brain activation for reading and listening comprehension: An fMRI study of modality effects and individual differences in language comprehension. Psychol Neurosci. 2009;2(2):111-123. doi: 10.3922/j.psns.2009.2.003. PMID: 21526132; PMCID: PMC3081613. Available at https://pubmed.ncbi.nlm.nih.gov/21526132/

Summary

This study investigated how the brain processes written and spoken language by comparing reading and listening comprehension of Portuguese sentences using functional MRI. Twelve adult participants read and listened to true-or-false statements while their brain activity was recorded.

Findings revealed a shared, amodal core network for comprehension in the left inferior frontal gyrus (LIFG) and left middle temporal gyrus (LMTG)—areas responsible for meaning integration irrespective of modality. However, distinct modality-specific patterns emerged:

  • Reading comprehension was more left-lateralized, activating the left inferior occipital cortex (including the fusiform gyrus), linked to visual word processing.
  • Listening comprehension elicited broader bilateral activation, especially in the superior and middle temporal gyri, reflecting auditory processing.

The study also explored individual differences in working memory. High-span readers showed efficient activation in a frontal-posterior network (left angular and precentral gyri; right inferior frontal gyrus), suggesting phonological rehearsal strategies. Low-span readers exhibited “spillover” activation into right-hemisphere regions and the prefrontal cortex, indicating greater reliance on executive control to manage comprehension demands.

Overall, the research demonstrates that while reading and listening comprehension share a central language network, each modality engages specialized sensory regions. Moreover, individual cognitive capacity influences neural efficiency during reading. These results support the theory that higher-level language comprehension is fundamentally amodal, relying on shared cognitive mechanisms across modalities.

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