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Evaluating interhemispheric connectivity during midline object recognition using EEG.

Anwesha Das1, Alexandra Mandel2,3, Hitoshi Shitara2,4

  • 1Human Motor Neurophysiology and Neuromodulation Lab, National Brain Research Centre (NBRC), Manesar, Haryana, India.

Plos One
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Midline object recognition involves alpha desynchronization, with the left occipito-temporal region playing a key role in integrating visual information for recognition, according to high-density EEG analysis.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Interhemispheric functional integration is vital for perceptual binding, especially for stimuli in the visual field's midline.
  • Previous EEG studies indicated midline object recognition correlates with decreased alpha power and increased interhemispheric coherence.

Purpose of the Study:

  • To replicate findings on alpha desynchronization during midline object recognition.
  • To investigate interhemispheric effective connectivity in source space during this task.
  • To enhance understanding of the neural basis of midline object recognition.

Main Methods:

  • Utilized high-density 64-channel electroencephalography (EEG) in 11 healthy adults performing a midline object recognition task.
  • Estimated task-related power and coherence in both sensor and source spaces.
  • Applied Granger causality analysis to assess effective connectivity between bilateral occipito-temporal regions.

Main Results:

  • Successfully replicated the alpha desynchronization associated with midline object recognition.
  • Localized the source of alpha desynchronization to the left occipito-temporal region.
  • Observed increased imaginary part of coherency in the alpha band between bilateral occipito-temporal regions.
  • Granger causality indicated bidirectional interaction, with a potential crucial role for the left occipito-temporal region in information integration.

Conclusions:

  • While alpha desynchronization was replicated, previous coherence findings were not.
  • The left occipito-temporal region appears critical for integrating visual information during midline object recognition.
  • This study provides robust insights into interhemispheric connectivity during midline object recognition using advanced EEG analysis.