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Endogenously generated gamma-band oscillations in early visual cortex: A neurofeedback study.

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Neurofeedback (NFB) training successfully enhanced gamma oscillations in visual cortex for most subjects. Successful participants showed increased theta activity, suggesting imagery, while others showed beta or alpha activity.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Brain-Computer Interfaces

Background:

  • Gamma oscillations are crucial for cognitive functions.
  • Impaired gamma synchronization is linked to various neurological conditions.
  • Neurofeedback (NFB) offers a potential avenue for modulating neural activity.

Purpose of the Study:

  • To investigate the feasibility of using NFB to enhance gamma oscillations in the early visual cortex.
  • To explore the neural correlates of successful and unsuccessful NFB training for gamma oscillations.
  • To determine if top-down signals can entrain gamma oscillations in the visual cortex.

Main Methods:

  • Utilized beamforming methods to identify and target specific regions and frequencies of gamma oscillations.
  • Employed real-time NFB with auditory feedback (tone pitch) linked to gamma power.
  • Analyzed concurrent changes in other brain oscillations (beta, theta, alpha) during NFB training.

Main Results:

  • Seven out of ten subjects successfully increased gamma oscillation amplitude via NFB without visual stimulation.
  • Successful NFB training correlated with increased theta oscillations (imagery) and beta oscillations (attention network).
  • Unsuccessful attempts were associated with increased beta oscillations and, in some cases, occipital alpha oscillations.

Conclusions:

  • Spatially confined networks in the early visual cortex can be entrained to generate gamma oscillations via top-down signals.
  • NFB holds promise for therapeutic applications in conditions characterized by disrupted gamma synchronization.
  • Distinct patterns of accompanying neural activity (theta, beta, alpha) differentiate successful from unsuccessful NFB training.