Journal of Sleep Disorders: Treatment and CareISSN: 2325-9639

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Short Communication, J Sleep Disor Treat Care Vol: 12 Issue: 1

Electrical Activity of the Brain through Electroencephalography

Hela Metodiev*

Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon, United States of America

*Corresponding Author: Hela Metodiev
Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon, United States of America

Received date: 07 February, 2023, Manuscript No. JSDTC-23-96139;

Editor assigned date: 10 February, 2023, PreQC No. JSDTC-23-96139 (PQ);

Reviewed date: 24 February, 2023, QC No. JSDTC-23-96139;

Revised date: 03 March, 2023, Manuscript No. JSDTC-23-96139 (R);

Published date: 10 March, 2023, DOI: 10.4172/2325-9639.23.12.107

Citation: Metodiev H (2023) Electrical Activity of the Brain through Electroencephalography. J Sleep Disor Treat Care 12:1.


Electroencephalography (EEG) is a neurophysiological non-invasive technique that measures the electrical activity of the brain. EEG has been widely used for decades to study the electrical patterns of the brain and gain insights into neural function.


EEG measures the electrical signals generated by the neurons in the brain. These signals, also known as brainwaves, are recorded using electrodes placed on the scalp. EEG provides a real-time and continuous measure of the brain's electrical activity, reflecting the synchronous firing of large populations of neurons [1].

Types of brainwaves

EEG recordings are typically categorized into different frequency bands, each associated with different states of consciousness and cognitive processes. The main types of brainwaves observed in EEG recordings are:

Delta waves (0.5-4 Hz): Delta waves are the slowest type of brainwaves and are usually associated with deep sleep and unconsciousness [2].

Theta waves (4-8 Hz): Theta waves are often seen during drowsiness, daydreaming and REM sleep and are thought to be involved in memory consolidation and emotional processing [3].

Alpha waves (8-12 Hz): Alpha waves are typically observed during relaxed wakefulness with closed eyes and are thought to reflect a state of relaxed alertness [4].

Beta waves (12-30 Hz): Beta waves are associated with active wakefulness, focused attention and cognitive processing [5].

Gamma waves (30-100 Hz): Gamma waves are the fastest type of brainwaves and are associated with high-level cognitive processes, such as perception, attention and memory [6].

Role of EEG in studying neural function

EEG has been widely used in neuroscience research to study a variety of cognitive processes, including perception, attention, memory, language and emotion. By analyzing the patterns of brainwaves recorded by EEG, researchers can gain insights into the neural mechanisms underlying these cognitive processes [7].

Sleep and EEG

One of the most well-known applications of EEG is the study of sleep. EEG recordings during sleep reveal distinct patterns of brainwaves that are associated with different stages of sleep. During Non-Rapid Eye Movement (NREM) sleep, characterized by stages N1, N2 and N3, the brainwaves gradually slow down, with delta waves becoming prominent in the deepest stage of N3 sleep. Rapid Eye Movement (REM) sleep, on the other hand, is characterized by a desynchronized pattern of brainwaves resembling wakefulness, with prominent theta and beta waves [8].

Clinical applications of EEG

EEG has also found widespread clinical applications in the diagnosis and monitoring of various neurological disorders. For example, EEG is commonly used to diagnose epilepsy by detecting abnormal patterns of brainwaves during seizures. It is also used in the assessment of brain function in patients with traumatic brain injury, stroke and neurodegenerative disorders [9].

Event-Related Potentials (ERPs)

EEG can also be used to measure ERPs, which are brief changes in brainwave activity that are time-locked to specific sensory, cognitive, or motor events. ERPs provide insights into the neural processes underlying perception, attention, memory and decision-making [10].

Advancements in EEG technology

Advancements in EEG technology have expanded the capabilities and applications of EEG. High-density EEG with a large number of electrodes allows for more precise spatial mapping of brain activity. Mobile EEG systems have enabled recordings in naturalistic settings and real-world environments, providing ecologically valid data. Brain- Computer Interfaces (BCIs) that use EEG signals as input have also been developed for various applications, such as controlling prosthetic limbs, aiding in neurorehabilitation and enhancing human-computer interaction.

Challenges and limitations of EEG

While EEG is a valuable tool for studying the electrical activity of the brain; it also has its limitations. EEG recordings are sensitive to various artifacts, such as muscle activity, eye movements and environmental noise, which can affect the quality of the data. The spatial resolution of EEG is limited due to the diffuse nature of electrical signals recorded from the scalp, making it challenging to pinpoint the exact location of neural activity. Additionally, individual variability in brain anatomy and skull thickness can affect the accuracy of EEG recordings.


EEG is a powerful technique that provides insights into the electrical activity of the brain and its role in neural function. Through the measurement of brainwaves, EEG has been used to study various cognitive processes, sleep and clinical applications. Advancements in EEG technology have expanded its capabilities and applications, allowing for more precise and ecologically valid recordings.


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