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Active And Passive Electrodes – What Are They, Pros & Cons

When the British physician Richard Caton first recorded the brain’s electrical activity on a rabbit in the late 19th century he didn’t know his groundbreaking experiment would inspire the invention of a line of revolutionary technologies that turned out to be indispensable assets of neuroscience. One of those inventions is Hans Berger’s electroencephalography (EEG), which transformed the diagnosis of neurological conditions. Since then EEG has gone through several advancements, of which a key one is active EEG electrodes.

Because every innovation comes with certain pluses and minuses, it is of primary importance to clarify them for users. The guiding principle of any EEG innovation is to improve the quality of signals recorded from the brain while balancing usability and user comfort. Only after fully understanding these pros and cons could one make the right choices for their use case be it clinical, research, or other.

What are Active and Passive Electrodes?

The brain’s electrical activity (brain potential) is a sum of the myriad discharges generated from neuronal action potentials. Although a single action potential is detectable in the millivolt (mV) range, the combined effect of a large population of neurons on the voltage of the brain tissue relative to a neutral point is the sum of all action potentials. Because of the inherent stochasticity of these action potentials, the simultaneous positive and negative fluctuations cancel each other. Therefore, the net voltage fluctuation in the brain tissue is a fraction of that of the neuron, yielding to a fluctuation in the microvolt (uV) range. Fortunately, neurons often act in concert to achieve effective control of target tissues. When they do so, the millions of action potentials synchronize in oscillatory patterns like flocking birds synchronize their flying. Those oscillations form traveling waves over the surface of the cerebral cortex penetrating the skull and yielding to discernable voltage fluctuation over the scalp, a signal known as EEG.

To noninvasively capture the brain’s electric potential fluctuations over the skull, two different EEG electrode technology options are available. One is passive electrodes and the other is active electrode technology. Passive electrodes are traditional EEG electrodes that simply transmit the voltage fluctuation to the amplifier through a conductive wire. To attain a low-impedance contact we use Silver-Silver Chloride (Ag/AgCl), or gold electrodes. However, the need for skin preparation to achieve a low enough impedance (under 10Kohm), the cost of the electrodes (~$10/electrode), the labor-intensive gluing method, the inconvenience to the patient, and most importantly the increasing cases of skin breakdown encouraged innovation in EEG electrode technology. A well glued gold-cup EEG electrode on a clean exposed skin surface with an adequate amount of electrode paste on a relaxed motionless subject in an electromagnetically shielded room, with the amplifier a few feet (1-2 m) distance from the subject, can provide a relatively clean EEG, that shows discernible delta, theta, alpha, beta oscillations in the EEG. These oscillations originate from the brain, hence passive electrode technology was for a while the ultimate low-cost, noninvasive brain activity monitoring modality for extensive clinical and research purposes.

Active electrode technology was developed partly in response to not needing skin preparation. The second factor was to prevent the weak EEG signal from being contaminated by noise while traveling through the long wire. The solution to handle both was moving a part of the amplifier as close as possible to the electrode thereby buffering the signal close to the scalp (Fig. 1). Because in the case of active electrode implementation the cables carry a signal driven strongly by the pre-amplifier which makes it less susceptible to electromagnetic interference thereby improving the signal to noise ratio. A high input impedance pre-amplifier also mitigates the need for abrading skin or using conductive paste in order to drop skin impedance.

Conventional EEG System vs Active Electrode Solution | Zeto

Figure 1. The graphical scheme of conventional EEG with an instrumentation amplifier before the backend (a) versus the active electrode solution where the amplifiers are placed proximal to the electrodes (From Xu et al., 2017).

The Active electrode has two components, the electrode, and the preamplifier circuit. The electrode materials need to be carefully chosen so as to not have polarization effects and are typically silver/silver chloride (Ag-AgCl). The performance of such a dry-active electrode array was first demonstrated at the University of California, Davis, by Babak Taheri in the 1990s.

Passive electrodes, in contrast, are generally plated with Ag-AgCl or gold and need electrolytic paste or gel (they are frequently called wet electrodes for this reason). However, the scalp is first prepared to minimize electrode-scalp impedance which is recommended to be under 10Kohm.

A report of the construction, performance, and results of the first dry-active electrode appeared in a 1994 scientific publication. One of the initial observations made was the fact that the arrayed active electrodes outperformed the passive electrodes.

To understand how active electrodes could achieve such a good performance we need to compare the underlying signal transmissions implemented by these two types of EEG electrodes.

Pros And Cons of Active and Passive EEG Electrodes

Active and Passive Electrodes Pros

Active electrodes allow pre-amplification modules close to the electrode. Hence, these EEG electrodes enable signal amplification before any extra noise attacks the EEG signal.

Active electrodes can make a big difference in a multitude of scenarios. First and most important, they enable the use of dry electrodes. Dry electrodes, in general, are associated with higher noise levels because they are not glued to the skin surface nor do they use a conductive gel that creates a low impedance bridge between the skin and the EEG electrodes.

Likewise, active electrodes do great when the measurement occurs in areas with fair amounts of electromagnetic noise and when there will be a considerable distance between the system and the electrodes used for EEG.

For passive electrodes, a conductive gel is a must to minimize impedance, so as to enable the signal to travel reliably through the wire. Moreover, during extended usage of wet passive electrodes, the gel may dry up leading to poor quality of the recording.

Active and Passive Electrodes Cons

On the other hand, passive electrodes are simpler to manufacture, and they cost and weigh less as they lack the pre-amplification modules that active electrodes have. Active electrodes also require more wires (additional power and ground) to enable the functioning of the pre-amplifier. Passive electrodes can achieve very good performance when the electrode has a stable low impedance.

Comparing Active and Passive EEG Electrodes in Amplification System Test

A growing number of studies demonstrated a superior signal quality of active electrodes over passive electrodes. When the active electrode technology is applied to dry electrodes, it can compensate for the higher impedance of the dry electrodes and achieve equivalence with the gel-loaded passive electrodes with all the benefits deriving from the active electrodes.

The illustration below was taken from a study involving 8 participants after recording EEG reading following the emission of auditory stimuli.

EEG results after emission of auditory stimuli | ZetoSource | INMHC

The reading produced by the active electrodes was instantaneous in response to the Event-Related Potentials (ERPs) recorded after the emission of the auditory stimulus. Furthermore, there was a significantly reduced error in the voltage difference between the EEG electrodes’ recorded measurement and the reference signal.

Another study compared the active and passive electrodes in an ERP during cognitive tasks (Laszlo et al., 2014). The study involved two experiments. In the first experiment, researchers manipulated interelectrode impedance in an electrically quiet setting to check if active electrodes produced better results under such recording conditions. In the second experiment, they studied active electrodes’ ability to record when limited by natural skin impedance. The investigation also explored the relationship between voltage stability and active amplification circuitry in EOG. Results from both experiments showed complicated connections between voltage stability, electrode types, and impedance. Ultimately, the study indicated that active electrodes outperformed passive electrodes at different impedance levels except for very low ones. To be specific, passive electrodes obtained higher quality data only when impedance was less than 2 kΩ. That said, it’s worth noting that passive ones also were better at accurately following the EEG than active ones in the event of rapid voltage fluctuations.

Conclusion

The quality of EEG recordings depends on several factors. Whether you prefer to use an active electrode EEG system or not, it is vital to know the pluses and minuses. Active electrode technology when used with high-quality electrodes (e.g., gold-plated) with conductive paste provides the best of both worlds, i.e., low skin impedance and a well-driven signal that is less susceptible to noise. However, in such cases when these electrode wires need to be disposed of due to wear and tear along with the pre-amplifier assembly, the cost could become prohibitively expensive. Hence active electrodes most commonly enable the use of dry electrode EEG systems, which allows you to reuse the EEG cap and dispose of just the electrodes. Such wireless EEG systems also enable the fast and easy setup of EEG without elaborate prep work. Signal quality in such cases has shown to be as good or in some cases better than just conventional passive electrodes. In summary, active electrode technology always makes the EEG signal quality better. They cost more because of the additional circuitry and wires needed. If disposed of with the electrode wires, they could be too expensive; however, if reused with a cap-like system, the cost is not a concern. With costs dropping fast for such commodity parts, there is adequate reason to believe active electrodes will replace passive ones in the next few years.

REFERENCES:

1) Xu J, Mitra S, Van Hoof C, Yazicioglu RF, Makinwa KAA. Active Electrodes for Wearable EEG Acquisition: Review and Electronics Design Methodology. IEEE Reviews in Biomedical Engineering. 2017 ;10:187-198. DOI: 10.1109/rbme.2017.2656388.

2) Kelly, J. W., Siewiorek, D. P., Smailagic, A., & Wang, W. (2013). Automated filtering of common-mode artifacts in multichannel physiological recordings. IEEE transactions on bio-medical engineering, 60(10), 2760-2770. https://doi.org/10.1109/TBME.2013.2264722

3) Laszlo S, Ruiz-Blondet M, Khalifian N, Chu F, Jin Z, A direct comparison of active and passive amplification electrodes in the same amplifier system, Journal of Neuroscience Methods, 2014, Volume 235, 298-307, https://doi.org/10.1016/j.jneumeth.2014.05.012.

Comparison of Dry Electrode EEG System with Conventional EEG System

The dry electrode EEG system is a new development in the field of diagnostic science, offering an alternative to the conventional wet electrode EEG system. 

To replace the wet EEG setup in clinical settings, dry electrode headsets must convey high-quality signals and give accurate results in terms of latency and amplitude. The dry electrode systems must also be able to separate biological signals from background noise. 

Before comparing these two approaches, it is important to understand how each one of them works.

A brief overview of the wet EEG device

The traditional EEG system consists of small metal discs (electrodes), covered with a silver/silver-chloride coating, which are placed on the scalp. Some recording systems use elastic head caps, which have electrodes built-in in preset positions, expediting the correct electrode placement according to the 10-20 international standard, assuming a proportional expansion and distribution of electrodes over different head sizes. 

Other, more traditional approaches, place single leads on the scalp one at a time using glue, gauze, and tape. An electrode gel is applied to the skin under the electrode to improve the skin-electrode conductivity and to reduce impedance. It also decreases the artifacts produced by the movements of electrode cables. 

Once the electrodes are positioned, it often requires scraping the surface of the skin using various tools to remove the upper layer of skin to improve the conductivity between the skin and the gel. 

Then the electrode is ready for recording the brain’s electrical activity and analyzing the data for diagnostic purposes.

A brief overview of the dry EEG device

In contrast to traditional electrodes, dry EEG systems make contact directly with the scalp and do not require conductive gel to be applied between the skin and electrode. That is made possible because of additional system components that increase the EEG signal strength right at the scalp. 

Since they do not require any skin preparation, dry electrodes make the EEG headset suitable for rapid EEG tests, eventually, beyond healthcare facilities. The dry electrodes are easy to place without the help of any additional instruments like syringes or gel cans. 

Moreover, after use, there is no need to clean the head as dry electrodes leave no residue on the skin or on the hair. Because dry electrodes are often made of plastic, they are affordable and can be made disposable, hence their use is a lot more hygienic and safer to be transferred between patients than traditional multiple-use electrodes.

Comparison of the dry and wet EEG system

The main purpose of introducing dry electrodes to be used in EEG systems was to improve the comfort of patients and experimental subjects while reducing the time of preparation. The dry electrodes are cleaner, more comfortable, quicker to set up and quicker to remove. In short, they are more practical.

In addition to convenience and comfort, there are additional requirements a good clinical electrode has to meet. 

An ideal dry EEG headset should stay on the patient’s head for hours to days or even weeks or more to ensure uninterrupted monitoring of the brain’s electrical activity. 

To achieve this in clinical practice, EEG technicians glue the electrodes one by one to the skin with a collodion adhesive, apply the gel and cover the electrodes with a gauze bandage.  The drawback of this method is that the gel dries quickly and needs to be replaced every few hours, which requires a trained EEG technologist to do as the head bandage needs to be replaced too. 

Therefore, while this type of traditional wet electrode system is acceptable in the clinical settings where EEG technologists are available around the clock, this dependency on skilled labor makes EEG underutilized in many clinical areas, such as ICU, ED, NICU, and stroke centers, to name a few.  

In contrast, dry electrode systems do not require an EEG technologist’s assistance to replace the electrodes. Introducing dry electrodes to clinical EEG monitoring, including long-term EEG, would not only free up the time of EEG technologists for EEG monitoring and allow them to complete more EEG studies but would also expand the use of EEG in clinical areas and clinics lacking EEG specialists on site.

Acceptance of the dry electrode systems in the clinical EEG market

Although dry electrode EEG headset systems have multiple advantages over gel-based electrodes, there is a barrier to widespread acceptance. 

According to conventional wisdom, the lower the impedance of electrodes the better the quality of the recording is. However, recent technological advances have brought about a new generation of amplifiers capable of amplifying the signal orders of magnitude better than conventional systems and overcoming the impedance-gap of dry electrodes. 

In addition, the introduction of active electrode technology, i.e. giving the EEG signal more strength by pre-amplifying the signal close to the electrode, ensures that the biological signal will not be affected by external electromagnetic noise before reaching the second amplifier stage. Conventional EEGs use passive electrodes, which makes the few micro-volt magnitude signals traveling in long cables from the electrode to the amplifier susceptible to electromagnetic noise especially upon movement of the cables.

Moreover, the active electrodes technology applies a driven current to each electrode that is being modulated by the brain’s electrical activity. The modulated signal will be detected by the electrodes and transferred to the amplifiers where the driven current will be subtracted from the signal to recover the brain’s original signal.

In addition to active electrode technology, dry electrode systems need good noise shielding and noise cancellation. As the biosignal travels through ‘unprepared’, high impedance skin layer, it becomes vulnerable to external noise such as 60Hz lines noise or other electrical interference in the room. Hence excellent shielding mechanisms are needed to protect the electrodes. 

Moreover, the system needs to incorporate dynamic common mode noise rejection circuitry to improve CMRR (Common Mode Rejection Ratio) above 130dB which allows signal quality to be on par with traditional wet EEG systems.

The Benefits of Dry EEG Headsets

The combination of these technologies makes dry electrodes not only on a par with conventional electrode recording quality but able to exceed that. 

As of today, many well-controlled and peer-reviewed studies have proven that dry electrode EEG headset systems are non-inferior to the conventional EEG and they are rapidly improving (Guger, Krausz, Allison, & Edlinger, 2012) (Di Flumeri et al., 2019; Fiedler et al., 2014; Hinrichs et al., 2020; Kam et al., 2019; Leach, Chung, Tüshaus, Huber, & Karlen, 2020; Li, Wu, Xia, He, & Jin, 2020; Mathewson, Harrison, & Kizuk, 2017; Schwarz, Escolano, Montesano, & Müller-Putz, 2020; Shad, Molinas, & Ytterdal, 2020; Zander et al., 2011).

The complicated nature of wet EEGs means they’re limited in the number of people they can reach. Extensive prep is needed, and this requires EEG technologists on hand at every step of the way. This limitation means EEGs can’t be rolled out in many settings where they can be most useful (ICU, ED, NICU, stroke centers, etc).

Dry EEG headsets solve this problem by making the setup simple. The average prep time is just five minutes, and the headset is comfortable for the patient, with gentle support pads making the process much more pleasant.

Of course, this wouldn’t be useful unless the results were accurate, and this is where the hard work has gone on behind the scenes. With technological improvements, studies are showing that results from EEG headsets are on par with conventional EEGs. 

By combining accurate results with much-improved convenience, dry EEG headsets represent a great step forward in the way we can study the brain.

Zeto Wireless EEG Headset 

The Zeto wireless EEG headset is the first FDA-approved true dry electrode EEG system. 

Traditional EEG systems have clear drawbacks, and many hospitals and clinics have been eagerly awaiting a better EEG testing option. That options arrived in 2020, as Zeto’s EEG headset brought new levels of convenience combined with exceptionally accurate results.

The headset offers:

  • Wireless, battery-powered
  • No skin-prep, no cleanup
  • Comfortable, no residue, soft tip electrodes
  • Adjustable headset for child to adult sizes
  • Precision placement as per 10-20 system
  • Easy to learn for anyone familiar with EEG

Live remote viewing of video EEG can be accessed through the cloud allowing for seamless data management, and a mobile EEG system.

Don’t be limited by a shortage of EEG technologists, discover the Zeto wireless EEG headset.

Infographic – Comparison of Dry Electrode EEG System with Conventional System

References

Di Flumeri, G., Aricò, P., Borghini, G., Sciaraffa, N., Di Florio, A., & Babiloni, F. (2019). The Dry Revolution: Evaluation of Three Different EEG Dry Electrode Types in Terms of Signal Spectral Features, Mental States Classification and Usability. Sensors (Basel, Switzerland), 19(6), 1365. https://doi.org/10.3390/s19061365

Fiedler, P., Haueisen, J., Jannek, D., Griebel, S., Zentner, L., Vaz, F., & Fonseca, C. (2014). Comparison of three types of dry electrodes for electroencephalography. In Acta IMEKO. https://doi.org/10.21014/acta_imeko.v3i3.94

Guger, C., Krausz, G., Allison, B., & Edlinger, G. (2012). Comparison of Dry and Gel Based Electrodes for P300 Brain–Computer Interfaces. Frontiers in Neuroscience, 6, 60. https://doi.org/10.3389/fnins.2012.00060

Hinrichs, H., Scholz, M., Baum, A. K., Kam, J. W. Y., Knight, R. T., & Heinze, H. J. (2020). Comparison between a wireless dry electrode EEG system with a conventional wired wet electrode EEG system for clinical applications. Scientific Reports. https://doi.org/10.1038/s41598-020-62154-0

Kam, J. W. Y., Griffin, S., Shen, A., Patel, S., Hinrichs, H., Heinze, H.-J., … Knight, R. T. (2019). Systematic comparison between a wireless EEG system with dry electrodes and a wired  EEG system with wet electrodes. NeuroImage, 184, 119–129. https://doi.org/10.1016/j.neuroimage.2018.09.012

Leach, S., Chung, K., Tüshaus, L., Huber, R., & Karlen, W. (2020). A Protocol for Comparing Dry and Wet EEG Electrodes During Sleep. Frontiers in Neuroscience, 14, 586. https://doi.org/10.3389/fnins.2020.00586

Li, G.-L., Wu, J.-T., Xia, Y.-H., He, Q.-G., & Jin, H.-G. (2020). Review of semi-dry electrodes for EEG recording. Journal of Neural Engineering, 17(5), 51004. https://doi.org/10.1088/1741-2552/abbd50

Mathewson, K. E., Harrison, T. J. L., & Kizuk, S. A. D. (2017). High and dry? Comparing active dry EEG electrodes to active and passive wet  electrodes. Psychophysiology, 54(1), 74–82. https://doi.org/10.1111/psyp.12536

Schwarz, A., Escolano, C., Montesano, L., & Müller-Putz, G. R. (2020). Analyzing and Decoding Natural Reach-and-Grasp Actions Using Gel, Water and Dry EEG Systems. Frontiers in Neuroscience, 14, 849. https://doi.org/10.3389/fnins.2020.00849

Shad, E. H. T., Molinas, M., & Ytterdal, T. (2020). Impedance and Noise of Passive and Active Dry EEG Electrodes: A Review. IEEE Sensors Journal, 20(24), 14565–14577. https://doi.org/10.1109/JSEN.2020.3012394

Zander, T., Lehne, M., Ihme, K., Jatzev, S., Correia, J., Kothe, C., … Nijboer, F. (2011). A Dry EEG-System for Scientific Research and Brain–Computer Interfaces. Frontiers in Neuroscience, 5, 53. https://doi.org/10.3389/fnins.2011.00053

A Guide to EEG Basics (Electroencephalography) & Devices Used

Every machine requires some circuitry or motherboard that controls the machine’s functions and operations. Likewise, humans also possess a complex computing system inside the body: the brain. The brain’s inner workings and connections are mysterious. An intricate system of neurons link together to form the brain’s jelly-like morphology.

Advancements in medical science and inventions have improved our understanding of how the brain works. One such invention was electroencephalography, a method and device used to record and analyze the electrical activity occurring inside the brain.

While the first EEG was performed in 1924, the technology is constantly evolving. Today, modern portable EEG devices are changing the way we look at the brain.

In this EEG guide, you’ll learn what an EEG machine is, what an electroencephalography is, how the EEG system operates, and what the various devices are used for.

What is Electroencephalography (EEG)?

Electroencephalography 1, or EEG, is a procedure used to measure and record the electrical activity of the brain in the form of waves. One can monitor the neurophysiological function of the brain while the subject is performing different tasks. Various electrical abnormalities can also be detected with precision.

As we understand the brain better, our EEG technology and the way we interpret the signals of the brain continue to improve. This has led to new ways of performing EEGs, such as wireless EEG systems that allow us to continue to learn the secrets of the brain.

What is an EEG?

Our brain is composed of billions of interconnected neurons. These neurons work by generating electrical potentials in the form of neuronal impulses which travel through the brain. EEG works on the principle of measuring these electrical potentials/voltages generated inside the brain.

What is an EEG Machine?

An EEG machine measures these electrical potentials by recording the differences in voltage between various points using a pair of electrodes. Then, the recorded data is sent to an amplifier.

The amplified data is eventually digitized and displayed on the monitor of the EEG machine as a sequence of voltage values that fluctuate in time. The resulting EEG waveforms from the EEG machine are interpreted to detect signs of abnormality inside the brain.

Parts of an EEG Machine

Essentially, an EEG machine is made up of the following primary device(s):

  • Electrodes: The electrodes pick up small electrical brainwaves produced by neurons. These are attached to the scalp with a special paste. Modern EEG machines possess a wearable cap with electrodes pre-installed inside the cap.
  • Amplifiers: As the signals travel from the electrodes through the machine, they run through an amplifier that boosts the incoming signal enough to be displayed on the screen.
  • Computer Control Module: The amplified signals are processed by a computer.
  • Display Device: The processed signals are displayed on the screen to be analyzed by the operator. Before the digital monitoring methods became prevalent, waveforms were plotted with a moving pen on rolls of graph paper.3

How is an EEG performed?

An EEG test may be performed either as an outpatient study or as part of your stay in the hospital. Various EEG technology and techniques are used depending on your health condition. Generally, an EEG procedure utilizing EEG technology is done in the following way:

  • The patient is asked to relax by lying on a bed or sitting in a chair.
  • Various electrodes (between 16, 20, or more) are attached to the scalp using a special electrolyte paste, or the patient is fitted with a cap containing the electrodes.
  • The patient is then asked to close their eyes and remain still.
  • Generally, an EEG technologist performs this procedure, which may take from 20 minutes to 2 hours, not including the electrode prepping.
  • Longer brain monitoring requires the patient to be admitted to the hospital.4

Modern technology has helped make this process easier in recent years. Today, portable EEG devices offer maximum convenience without compromising the quality of the results.

For the EEG operator, this brings down prep times (it’s easy to put on and adjust, and there’s no messy glue or wires to clean up), and for the patient, this offers increased comfort (the soft support pads are gentle on the skin). 

Also known as rapid EEGs, these devices make EEG technology much more accessible, allowing more people to benefit from it. The portable EEG machine sends results to the Zeto app, allowing practitioners to access live results from anywhere. 

We’re still working hard to understand the human brain, and many mysteries remain, but with each technological improvement in EEG machines, we take a step closer to solving the puzzle of the human brain. Portable EEG machines allow us to study the brain more efficiently, offering benefits to researchers, practitioners, and patients.

What Does an EEG Measure?

At its most basic, an EEG measures brainwaves. Electrical signals generated by the brain are displayed on the screen in the form of waves that vary in amplitude, phase, and frequency.

Fast Fourier Transform (FFT) and other signal processing techniques convert the incoming signals measured by the EEG  into useful information that can aid diagnosis. Brainwaves are categorized into four main types based on frequency: Infra-low, Delta, Theta, Alpha, Beta, and Gamma.

Each brainwave is associated with particular functions of the brain. The following paragraphs discuss the various important functions of the brain in correlation with the types of brainwaves.

Delta Waves (frequency ranging from 0.5 Hz to 3 Hz)

Delta waves are slow but loud brainwaves (like the deeply penetrating waves of a drum beat). They are generated during dreamless sleep. Delta waves are intermittent with sleep spindles and sharp waves. When delta waves synchronize between distant cortical areas, they often trigger sharp waves that are considered to be relevant for memory consolidation. 6

Theta Waves (frequency ranging from 3 Hz to 7 Hz)

Theta waves mostly occur during REM sleep. They derive from deep subcortical sources, making them mostly undetectable with an EEG machine. The predominant occurrence of theta is pathological. Normal theta waves are known to be involved in learning and memory. In theta state, we experience dreams comprising vivid imageries and intuitions. 7

Alpha Waves (frequency ranging from 7 Hz to 13 Hz)

Alpha waves occur when the person is in a relaxed, lucid, or calm state. These are mostly found in the occipital and posterior regions of the brain. Whenever someone is asked to close his/her eyes and then relax, the brain is disengaged from any complex cognitive tasks or thinking, and alpha waves are induced. 8

Beta Waves (frequency ranging from 14 Hz to about 38 Hz)

Beta waves refer to the alert, attentive, and conscious state of mind. These are of low amplitude and are also associated with motor decisions. Beta waves are further subdivided into:

  • Low-Beta Waves (Beta1, 12-15 Hz): occur while musing
  • Mid-Beta Waves (Beta2, 15-22 Hz): occur while engaging intensely in something or actively figuring something out.
  • High-Beta Waves (Beta3, 22-38 Hz): occur during complex thoughts and integration of new experiences. Also related to severe anxiety or excitement. 9

Gamma Waves (frequency ranging from 38 Hz to 120 Hz)

These are the fastest of all the brainwaves with the highest frequency and smallest amplitude. Because of the small amplitude and high frequency, they are often contaminated by electrical noise or muscle artifacts.

If gamma waves are captured and measured by EEG, they inform us about information processing in the brain.10 The synchrony of gamma waves between different parts of the brain reflects information exchange between those areas. Gamma waves still remain a mystery as these waves orchestrate the synchronized activity of neurons.

  • Low-Gamma Waves (38-60 Hz): Active attentive behavior and cognitive tasks
  • High-Gamma Waves (60-120 Hz): Their function is not quite clear, but the predominant occurrence is regarded as diagnostic of epilepsy.

What Does an EEG Test Diagnose?

EEG technology is currently used to diagnose and help treat brain-related disorders.

  • EEG is the most powerful and preferred diagnostic procedure for epilepsy.13
  • EEG is very helpful in diagnosing sleep disorders such as insomnias, parasomnias, etc.14
  • EEG has valuable diagnostic potential for other neurological conditions such as Stroke, Autism, Depression, and ADHD, to name a few.
  • EEG is turning out to be the tool for the next generation of Brain-Computer Interfaces and Neural Prosthetics
  • EEG can be used to track attention during several activities, to help design strategies to reduce stress and improve focus.15
  • EEG has been introduced as a new tool for Neuromarketing studies to help objectively identify participants’ responses.

And the list is growing…

The Bottom Line

The invention of the EEG system opened a new window of learning about the brain. With the EEG system to guide them, neurologists have been able to successfully treat seizures, epilepsy, sleep disorders, and other neurological issues.

As EEG becomes simpler, easier to acquire and interpret, and wireless, even more can be achieved. With new advancements in electronics, cloud computing, and machine learning, it is just a question of how soon.

The future of EEG is bright. Consequently, the advancements in our understanding of the brain cannot be more exciting. Learn more about wet vs. dry EEG tests here.

References

1. Electroencephalogram (EEG) | Johns Hopkins Medicine. https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/electroencephalogram-eeg.

2. Introduction – Electroencephalography (EEG): An Introductory Text and Atlas of Normal and Abnormal Findings in Adults, Children, and Infants – NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK390346/.

3. Wang, C. S. Design of a 32-channel EEG system for brain control interface applications. J. Biomed. Biotechnol. 2012, (2012).

4. Light, G. A. et al. Electroencephalography (EEG) and event-related potentials (ERPs) with human participants. Current Protocols in Neuroscience vol. CHAPTER Unit (2010).

5. Watson, B. O. Cognitive and physiologic impacts of the infraslow oscillation. Frontiers in Systems Neuroscience vol. 12 44 (2018).

6. Harmony, T. The functional significance of delta oscillations in cognitive processing. Frontiers in Integrative Neuroscience vol. 7 (2013).

7. Zhang, H. & Jacobs, J. Traveling theta waves in the human hippocampus. J. Neurosci. 35, 12477-12487 (2015).

8. Klimesch, W. Alpha-band oscillations, attention, and controlled access to stored information. Trends in Cognitive Sciences vol. 16 606-617 (2012).

9. Beta Wave – an overview | ScienceDirect Topics. https://www.sciencedirect.com/topics/medicine-and-dentistry/beta-wave.

10. Gamma Wave – an overview | ScienceDirect Topics. https://www.sciencedirect.com/topics/neuroscience/gamma-wave.

11. Michal T. Kucewicz, Brent M. Berry, Vaclav Kremen, Benjamin H. Brinkmann, Michael R. Sperling, Barbara C. Jobst, Robert E. Gross, Bradley Lega, Sameer A. Sheth, Joel M. Stein, Sandthitsu R. Das, Richard Gorniak, S. Matthew Stead, Daniel S. Rizzuto, Michael J. Kahana, Gregory A. Worrell, Dissecting gamma frequency activity during human memory processing, Brain , Volume 140, Issue 5, May 2017, Pages 1337-1350, https://doi.org/10.1093/brain/awx043

12. Ren, L., Kucewicz, M. T., Cimbalnik, J., Matsumoto, J. Y., Brinkmann, B. H., Hu, W., Marsh, W. R., Meyer, F. B., Stead, S. M., & Worrell, G. A. (2015). Gamma oscillations precede interictal epileptiform spikes in the seizure onset zone. Neurology , 84 (6), 602-608. https://doi.org/10.1212/WNL.0000000000001234

13. Smith, S. J. M. EEG in the diagnosis, classification, and management of patients with epilepsy. Neurology in Practice vol. 76 2-7 (2005).

14. Tan, D. E. B., Tung, R. S., Leong, W. Y. & Than, J. C. M. Sleep disorder detection and identification. in Procedia Engineering vol. 41 289-295 (Elsevier Ltd, 2012).

15. Thompson, T., Steffert, T., Ros, T., Leach, J. & Gruzelier, J. EEG applications for sport and performance. Methods 45 , 279-288 (2008).