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Olfactory Receptors: Location and Structure01:03

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Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment
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Olfactory Network Differences in Master Sommeliers: Connectivity Analysis Using Granger Causality and Graph

Karthik Sreenivasan1, Xiaowei Zhuang1, Sarah J Banks1

  • 11 Cleveland Clinic Lou Ruvo Center for Brain Health, Las Vegas, Nevada.

Brain Connectivity
|January 28, 2017
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Summary

Master Sommeliers exhibit distinct brain network connectivity compared to controls, revealing neuroplasticity relevant to cognitive function and neurodegenerative diseases like Alzheimer's.

Keywords:
Granger causalityeffective connectivityexpertsfunctional magnetic resonance imaginggraph theoryolfaction

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Olfactory Perception

Background:

  • Expertise influences brain activity in olfactory processing.
  • Limited understanding of how expertise affects brain network connectivity.

Purpose of the Study:

  • Investigate differences in causal connectivity and network topology in Master Sommeliers' brains.
  • Examine functional magnetic resonance imaging (fMRI) data during olfactory tasks.

Main Methods:

  • Used fMRI to scan Master Sommeliers and controls during olfactory and non-olfactory tasks.
  • Applied dynamic multivariate autoregressive models to analyze brain region connectivity.
  • Utilized graph theory to assess network topological properties.

Main Results:

  • Sommeliers showed greater connectivity in regions including the precuneus, caudate, and putamen.
  • Controls exhibited increased connectivity from the hippocampus to frontal regions.
  • Sommeliers displayed significantly higher small-world network topology.

Conclusions:

  • Expertise shapes adult neuroplasticity in brain networks involved in olfactory processing.
  • Findings have implications for understanding neurodegeneration in Alzheimer's and Parkinson's diseases.