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Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice
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Frequency specific spatial interactions in human electrocorticography: V1 alpha oscillations reflect surround

B M Harvey1, M J Vansteensel, C H Ferrier

  • 1Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht 3584 CS, Netherlands. b.m.harvey@uu.nl

Neuroimage
|October 23, 2012
PubMed
Summary

Brain alpha oscillations in the visual cortex (V1) reflect localized neural suppression, distinct from broader network activity in the intraparietal sulcus (IPS). This study differentiates the functional roles of brain oscillations across regions.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Functional Neuroimaging

Background:

  • Brain activity is analyzed by decomposing electrical signals into frequency bands.
  • Different frequency bands are associated with distinct neural functions.
  • Understanding regional differences in oscillatory activity is crucial for mapping brain function.

Purpose of the Study:

  • To investigate the distinct roles of brain oscillations in primary visual cortex (V1) and intraparietal sulcus (IPS).
  • To compare electrocorticography (ECoG) and functional magnetic resonance imaging (fMRI) measures of neural activity.
  • To characterize the functional significance of alpha oscillations in V1.

Main Methods:

  • Subdural electrocorticography (ECoG) and functional magnetic resonance imaging (fMRI) were used to measure brain activity.
  • Population receptive fields (pRFs) were reconstructed using gamma oscillations (30-120 Hz) and fMRI BOLD signals.
  • Frequency spectra across various bands (theta, alpha, beta) were analyzed in V1 and IPS.

Main Results:

  • Gamma oscillations (30-120 Hz) in V1 and IPS enabled pRF reconstruction comparable to fMRI.
  • V1 alpha oscillations (9-12 Hz) showed increased power outside the pRF, indicating surround suppression.
  • IPS oscillations (3-25 Hz) were strongest during baseline and correlated across electrodes, suggesting network disengagement.

Conclusions:

  • V1 alpha oscillations reflect localized, stimulus-dependent functional processes, correlating with negative fMRI signals.
  • Alpha oscillations in V1 and IPS serve different functional roles, with both potentially reflecting suppression of neural spiking activity.
  • This study highlights the importance of considering regional specificity when interpreting brain oscillations.