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Discrete tactile feature comparison subprocess in human brain during a decision-making process.

Dong Hyeok Lee1, June Sic Kim2, Seokyun Ryun3

  • 1Department of Brain and Cognitive Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 15, 2023
PubMed
Summary

This study reveals how the brain compares sensory information for decision-making. The inferior parietal lobule and secondary somatosensory cortex process tactile comparisons differently, influencing response times.

Keywords:
Decision-makingElectrocorticographyInferior parietal lobuleSecondary somatosensory cortexSomatosensory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Decision-Making Research

Background:

  • Decision-making involves sequential processing of sensory information along cortical networks.
  • The specific subprocess of comparing encoded sensory features before a decision remains unclear in humans.

Purpose of the Study:

  • To investigate sensory feature comparison during decision-making.
  • To elucidate the distinct roles of brain regions in comparing tactile stimuli.

Main Methods:

  • Electrocorticography (ECoG) was recorded from epilepsy patients performing tactile discrimination and detection tasks.
  • Tactile-specific gamma band power (30-200 Hz) was analyzed and correlated with response times.
  • Connectivity analysis was performed to understand information flow between brain regions.

Main Results:

  • Decision-making was divided into categorization, comparison, and decision subprocesses, occurring sequentially in prefrontal, premotor, somatosensory, and parietal cortices.
  • The inferior parietal lobule (IPL) showed a negative correlation between gamma power and response time (faster responses with higher gamma power).
  • The secondary somatosensory cortex (S2) exhibited a positive correlation (slower responses with higher gamma power), indicating differential encoding of tactile feature comparison.

Conclusions:

  • The IPL and S2 encode tactile feature comparison distinctively, contributing differently to the decision-making process.
  • Information flows from S2 to the IPL during tactile comparison.
  • Multiple parietal lobe areas contribute uniquely to sensory feature comparison before a decision is made.