Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Brain Waves

Brain Waves

Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

[Microdialysis--a new method of monitoring of the transplanted cadaveric kidneys function].

Anesteziologiia i reanimatologiia·2015

Same author

Production response to corn silage produced from normal, brown midrib, or waxy corn hybrids.

Journal of dairy science·2012

Same author

The effect of age on the concentration of chloride and water in chick tissues.

Journal of gerontology·2010

Same author

EMG contamination of EEG: spectral and topographical characteristics.

Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology·2003

Same author

MRI of human entorhinal cortex: a reliable protocol for volumetric measurement.

Neurobiology of aging·2001

Same author

8-aminoquinolines as anticoccidials - Part III.

Bioorganic & medicinal chemistry letters·1999

Search research articles

Related Experiment Video

Updated: Jul 19, 2026

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits

Published on: March 27, 2021

Changes in EEG mean frequency and spectral purity during spontaneous alpha blocking.

I I Goncharova¹, J S Barlow

¹Laboratory of Automation of Ergonomics Research, U.S.S.R. Research Institute of Industrial Design, Moscow.

Electroencephalography and Clinical Neurophysiology

|September 1, 1990

Summary

Investigating alpha blocking in human EEG, this study found that irregular activity periods show decreased spectral purity but stable mean frequency. This suggests

More Related Videos

BrainBeats as an Open-Source EEGLAB Plugin to Jointly Analyze EEG and Cardiovascular Signals

BrainBeats as an Open-Source EEGLAB Plugin to Jointly Analyze EEG and Cardiovascular Signals

Published on: April 26, 2024

High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System

High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System

Published on: September 27, 2024

Related Experiment Videos

Last Updated: Jul 19, 2026

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits

Published on: March 27, 2021

BrainBeats as an Open-Source EEGLAB Plugin to Jointly Analyze EEG and Cardiovascular Signals

BrainBeats as an Open-Source EEGLAB Plugin to Jointly Analyze EEG and Cardiovascular Signals

Published on: April 26, 2024

High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System

High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System

Published on: September 27, 2024

Area of Science:

Neuroscience
Electroencephalography (EEG)

Background:

Alpha blocking is characterized by brief periods of lower voltage irregular activity during eyes-closed resting occipital EEG.
The precise electrophysiological characteristics of these transient EEG events are not fully understood.

Purpose of the Study:

To investigate changes in mean frequency and spectral purity during spontaneous alpha blocking periods.
To evaluate the accuracy of the term 'low-voltage fast activity' for these EEG events.

Main Methods:

Utilized eyes-closed resting occipital EEG recordings from 32 healthy subjects.
Developed new methods for evaluating mean frequency and spectral purity (Spectral Purity Index) over a 0.5-second window with 0.1-second steps.
Analyzed conjoint changes in these EEG parameters during irregular activity periods.

Main Results:

Spectral purity consistently decreased during periods of lower voltage irregular activity.
Mean frequency remained relatively unaltered, with changes not exceeding +/- 2.5 Hz.

Conclusions:

The term 'low-voltage fast activity' may be inaccurate for spontaneous irregular EEG activity during alpha blocking.
EEG analysis reveals distinct changes in spectral purity without significant alterations in mean frequency during these events.