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Updated: Jul 18, 2026

Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
Published on: December 12, 2012
Function-specific high-probability "nodes" identified in posterior language cortex
T H Schwartz1, O Devinsky, W Doyle
1Department of Neurological Surgery, The Neurological Institute of New York, Columbia-Presbyterian Medical Center, New York 10032, USA.
Posterior language areas, despite variability, show organized "nodes" for specific language functions like reading and naming. This suggests a structured, modular architecture in the brain for language processing.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neurolinguistics
Background:
- Posterior language areas, including Wernicke's area, exhibit significant variability in location across individuals.
- Electrical stimulation mapping has revealed this between-subject variability in functional localization.
Purpose of the Study:
- To investigate the potential for an organized structure within the distribution of posterior language areas.
- To determine if language processing is randomly distributed or exhibits a predictable pattern.
Main Methods:
- Utilized extraoperative subdural grid stimulation in 67 patients undergoing epilepsy surgery.
- Administered stimulation during tasks of counting, naming, and reading to map language functions.
- Generated intersubject-averaged language maps to identify consistent functional sites.
Main Results:
- Language sites, while variable, were not randomly distributed, forming distinct, non-contiguous "nodes."
- Speech arrest sites localized to Wernicke's area; reading-specific sites were in the posterior middle temporal gyrus and inferior parietal lobule.
- Naming-specific sites were in the posterior inferior temporal gyrus; sites for both naming and reading errors were more anterior and variable, potentially representing semantic processing.
Conclusions:
- The identified high-probability nodes support a modality-specific modular architecture for language.
- These findings suggest a conserved and potentially universal structural organization of posterior language cortex.
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