Related Experiment Video
Updated: May 12, 2026

Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
Published on: May 23, 2025
A multimodal perspective on the composition of cortical oscillations
Kim C Ronnqvist1, Craig J McAllister, Gavin L Woodhall
1Aston Brain Centre, School of Life and Health Sciences, Aston University Birmingham, UK.
This study compares human magnetoencephalography (MEG) with rodent brain slices to understand neural oscillations. Findings suggest MEG signals integrate signals from different cortical layers, driven by similar mechanisms and influenced by connectivity.
Area of Science:
- Neuroscience
- Biophysics
- Computational Neuroscience
Background:
- Functional magnetic resonance imaging (fMRI) and electroencephalography (EEG)/magnetoencephalography (MEG) are commonly used to study brain activity.
- Limited understanding exists regarding the precise relationship between EEG/MEG oscillations and the specific neural networks generating them.
Purpose of the Study:
- To clarify the genesis and composition of EEG/MEG oscillations.
- To compare spontaneous activity in primary motor cortex (M1) oscillations using human MEG and in vitro rodent local field potentials.
- To investigate the influence of pharmacological modulation and cortico-cortical connectivity on these oscillations.
Main Methods:
- Parallel recordings of human MEG and in vitro rodent local field potentials from M1.
- Comparison of spontaneous activity in mu (~10 Hz) and beta (15-30 Hz) frequency bands.
- Pharmacological modulation using zolpidem (GABA-A alpha-1 subunit modulator) and assessment of cortico-cortical connectivity by severing connections in vitro.
Main Results:
- MEG signal frequency distribution showed greater statistical similarity to integrated rather than independent layers III and V (LIII/LV) in vitro.
- GABAergic modulation similarly affected beta band power in both MEG and in vitro recordings.
- Cortico-cortical connectivity significantly influenced mu rhythm power in LIII.
Conclusions:
- The MEG signal likely represents an amalgamation of outputs from LIII and LV.
- Multiple oscillation frequencies can originate from the same cortical area.
- In vitro and MEG M1 oscillations are governed by comparable mechanisms, with cortico-cortical connectivity impacting sensorimotor cortex (SMC) mu rhythm power.
More Related Videos
Related Concept Videos
Somatosensory, Motor, and Association Cortex
Multicompartment Models: Overview
These models offer a more comprehensive representation of drug behavior in the body than one-compartment models. They accommodate the complexity of drug distribution,...
Motor and Sensory Areas of the Cortex
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Propagation of Action Potentials
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Association Areas of the Cortex
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Cerebral Hemispheres
