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Spatial-Temporal Current Source Correlations and Cortical Connectivity

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Check out this Knowledge Base article from StressTherapy Solutions: Spatial-Temporal Current Source Correlations and Cortical Connectivity.

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Study at a glance

Area
QEEG, Methods & Mechanisms
Study type
Observational study
Authors
Thatcher RW, Biver CJ, North D
Journal
Clinical EEG and Neuroscience
Year
2007
Participants
97 (ages 5-37, mean age 10.4; 58 male)
Population
Children, Adolescents, Adults
Protocol
resting eyes-closed EEG with LORETA source correlation analysis

Key findings

  • Occipital regions showed the strongest short-distance correlations; frontal regions the strongest long-distance correlations
  • Right-hemisphere within-hemisphere correlations were generally higher than left, especially in temporal, parietal and occipital cortex
  • Largest left-right differences appeared in the alpha (8-12 Hz) and gamma (37-40 Hz) bands
  • Higher neural packing density was linked to a greater intra-cortical contribution to source correlations

DOI 10.1177/155005940703800109 → PubMed 17319590 →

This study examined how activity in different cortical regions rises and falls together over time, using LORETA (low resolution electromagnetic tomography) to estimate brain sources from 19-channel resting eyes-closed EEG. Source activity was averaged in 33 regions per hemisphere and correlated across successive 2-second epochs. Correlations varied rhythmically with distance and differed by lobe, frequency and hemisphere. The authors conclude the patterns reflect neural packing density and short 'U' shaped and long-distance fiber connections.