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EEG oscillations: From correlation to causality.

Christoph S Herrmann1, Daniel Strüber1, Randolph F Helfrich2

  • 1Experimental Psychology Lab, Department of Psychology, Cluster of Excellence "Hearing4all", European Medical School, Carl von Ossietzky Universität, 26111 Oldenburg, Germany; Research Center Neurosensory Science, Carl von Ossietzky Universität, 26111 Oldenburg, Germany.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|February 10, 2015
PubMed
Summary
This summary is machine-generated.

Modulating brain oscillations, like alpha and beta waves, helps understand cognitive functions. Techniques such as transcranial alternating current stimulation (tACS) allow researchers to establish causal links between brain activity and cognition.

Keywords:
Brain oscillationsEEGElectroencephalographyNeuronal entrainmentRepetitive transcranial magnetic stimulation (rTMS)Transcranial alternating current stimulation (tACS)

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Human electroencephalography (EEG) has identified links between brain oscillations (delta, theta, alpha, beta, gamma) and cognitive processes.
  • Correlative EEG data suggest brain oscillations are crucial for sensory and cognitive functions, but direct causal evidence is needed.

Purpose of the Study:

  • To review methods for directly modulating neuronal oscillations.
  • To highlight transcranial alternating current stimulation (tACS) as a key technique for establishing causal links between brain oscillations and cognitive functions.

Main Methods:

  • Review of techniques including EEG-neurofeedback, rhythmic sensory stimulation, repetitive transcranial magnetic stimulation (rTMS), and transcranial alternating current stimulation (tACS).
  • Focus on tACS studies demonstrating behavioral, electrophysiological, or combined effects, including simultaneous tACS-EEG recordings.
  • Discussion of tACS's ability to modulate specific frequencies and cross-frequency interactions.

Main Results:

  • Various methods can selectively modulate neuronal oscillations.
  • tACS is effective in directly modulating brain activity, yielding observable behavioral and electrophysiological effects.
  • Emerging evidence indicates tACS can influence cross-frequency interactions.

Conclusions:

  • Direct modulation of neuronal oscillations is essential for demonstrating causal relationships between brain activity and cognitive processes.
  • Techniques like tACS provide powerful tools for investigating the functional roles of brain oscillations in human cognition.