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Investigating the Triple Code Model in numerical cognition using stereotactic electroencephalography.

Alexander P Rockhill1, Hao Tan1, Christian G Lopez Ramos1

  • 1Departments of Neurological Surgery, Oregon Health & Science University, Portland, Oregon, United States of America.

Plos One
|December 3, 2024
PubMed
Summary
This summary is machine-generated.

This study used intracranial electroencephalography to investigate number processing, finding bilateral parietal lobes are key. Different number formats engage distinct brain regions, supporting the Triple Code Model of numerical cognition.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Numerical Cognition

Background:

  • The Triple Code Model posits distinct neural substrates for visual, auditory, and non-symbolic numerical representations.
  • Understanding human number cognition benefits from neuroimaging, but intracranial electrophysiological correlates are less explored.

Purpose of the Study:

  • To investigate intracranial electrophysiological correlates of number processing using stereotactic electroencephalography (SEEG).
  • To examine how different numerical representation types (symbolic vs. non-symbolic) and stimulus modes (visual vs. auditory) engage specific brain regions.

Main Methods:

  • 13 epilepsy patients undergoing SEEG participated in a number recognition task with varied numerical stimuli.
  • Principal component analysis and linear support vector machine classification were used on time-frequency spectrograms to identify number-processing regions.
  • Analysis focused on distinguishing number perception from inter-trial periods.

Main Results:

  • Bilateral parietal lobes showed the highest classification accuracy across all number formats.
  • Auditory and visual number formats engaged superior temporal and frontoparietal regions, respectively.
  • The left parietal cortex was highly accurate for number dots, and the putamen showed robust responses to numerical stimuli.
  • Non-gamma frequencies below 30 Hz demonstrated classification value for format-specific number representations.

Conclusions:

  • Intracranial recordings provide further support and expansion of the Triple Code Model for numerical cognition.
  • Findings highlight the role of bilateral parietal lobes and specific frequency bands in processing diverse numerical information.