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Related Experiment Video

Updated: Jul 13, 2026

EEG Mu Rhythm in Typical and Atypical Development

EEG Mu Rhythm in Typical and Atypical Development

Published on: April 9, 2014

On the human sensorimotor-cortex beta rhythm: sources and modeling.

O Jensen¹, P Goel, N Kopell

¹Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, Finland. ole.jensen@fcdonders.ru.nl

|May 24, 2005

Summary

Benzodiazepines enhance beta oscillations in the human motor cortex by increasing GABAergic inhibition. This effect, observed in both human studies and neuronal network simulations, highlights the role of inhibitory neuron activity in generating these brain rhythms.

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Published on: December 5, 2014

Area of Science:

Neuroscience
Computational Neuroscience

Background:

Cortical beta oscillations (13-35 Hz) are modulated by GABAergic agonists like benzodiazepines.
Previous research implicates motor cortex sources in generating the beta rhythm.

Purpose of the Study:

To investigate the mechanisms underlying the generation of approximately 20-Hz oscillations in the human cortex.
To explore how benzodiazepines modulate beta oscillations and the underlying neuronal synchronization.

Main Methods:

Administered benzodiazepines to healthy adults and monitored cortical activity using magnetoencephalography (MEG).
Performed minimum current estimates to localize the effects of benzodiazepines.
Simulated a conductance-based neuronal network model with excitatory and inhibitory neurons.

Main Results:

Benzodiazepines increased beta oscillation power and decreased frequency over rolandic areas, specifically around the primary sensorimotor cortex.
Neuronal network simulations replicated the observed increase in beta power, spectral peak widening, and frequency slowing.
Increased inhibitory postsynaptic currents (IPSCs) onto inhibitory neurons were found to be crucial for beta band synchronization.

Conclusions:

Benzodiazepines modulate beta oscillations originating from motor cortex sources.
Increased GABAergic inhibition, particularly onto inhibitory neurons, is a key mechanism for generating beta band synchronization in the cortex.