Questions tagged [electroencephalography]

An electroencephalogram (EEG) is a test that detects electrical activity in the brain using small, flat metal discs (electrodes) attached to the scalp. The brain cells communicate via electrical impulses and are active all the time, even when you're asleep. This activity shows up as brain waves on an EEG recording (1).

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What is “integrated spindle activity” in plain English?

From a research article: To determine if a combination of spindle parameters allowed for a better group discrimination, integrated spindle activity (ISA) was calculated by integrating over time ...
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What's the proper term for “brain waves” read from an EEG?

An EEG records the electrical activity of the brain. An EEG shows voltage differences as a function of time and shows what have become known as "brain waves". Is there a scientific/technical word/...
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Understanding the configuration of channels in the 10-20 EEG montage

In a typical 10-20 system there are 21 electrodes placed on the scalp. However, this does not mean there are 21 distinct "channels" or voltage sources. I've heard that some of these electrodes are "...
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What signal processors comprise an Event-Related Potential system for EEG?

So my 30,000 ft. understanding of the EEG signal processing data flow is: Capture raw EEG data ("raw waveforms") Run these raw waveforms through a Signal Processing Framework that consists of 1+ "...
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Why is Fast Fourier Transform applied to raw EEG data?

I am trying to understand why Fast Fourier Transform (FFT) is used in the analysis of raw EEG channel data. My understanding (at the 30,000 ft view) is that FFT decomposes linear differential ...
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Can multiple overt/covert intentions produce identical EEG readings?

With sophisticated techniques likes ERP, it is possible to correlate certain EEG activity with certain overt/covert actions. What I'm wondering is: is there a risk for 2+ overt/covert actions ...
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Do repetitive movements on EEGs show up as discernible patterns?

Here is a typical EEG reading: (source: frontalcortex.com) If I am connected to an EEG, and am sitting perfectly still, and then begin doing some repetitive motion, say, 10,000 times, will we see ...
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What are wave frequencies in the EEG?

Here is a typical EEG reading: (source: frontalcortex.com) I understand that each row corresponds to the signal read between two sensors on a standard 10-20 (or 10-5) distribution setup (e.g. <...
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Brain wave and motor movement correlation

I am trying to better understand which brain waves are generated when the motor system (arms, legs, muscles of any kind) are activated. According to Wikipedia, several types (Beta, Gamma, Mu) appear ...
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Efficacy of the 10-20 montage for EEG

I am trying to better understand the relationship between the placement of EEG electrodes and the quality of the "brainwave" signals they produce. There is the standard 10-20 system which has me ...
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What physical or mental actions can be picked up by EEGs?

There certainly seem to be a lot of gadgets and gizmos leveraging EEG technologies to the control of devices. This makes me wonder: what intentions/thoughts can be captured by EEG technology, and ...
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Electrode locations for neuron study in stereo EEG?

I am thinking where to put optimally depth electrodes in stereo EEG outside sulci in studying the functioning of neural transmission of N neurons over one perivascular space in rodents, mice or rat, ...
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How can neuronal signals faithfully be reproduced by scalp electrodes?

There is a skull barrier (and possibly other layers too) between the brain and the scalp. I have seen people trying to extract EEG signals from the scalp by connecting electrodes and interface it to ...
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How are isopotential maps computed from EEG channel data

I have some EEG recordings of $1$ minutes, with $500$ samples per seconds and $63$ channels. For each recordings, this effectively yields a $30,000\times 63$ matrix $M$. How do I extract isopotential ...
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EM Brainwaves VS Brain Wave (EEG) [closed]

The brain purportedly produces very weak EM waves. EEG is a method of measuring electrical brain activity, it has classifications for the types of brain wave it can detect: Theta, Alpha, Beta, Gamma ...
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How does the frequency of a visual stimulus affect the steady-state visually evoked potential?

I want to design a project for EEG signal processing. In my research I found the concept of SSVEP. SSVEPs represent the electrical activity of the brain as measured via EEG, and are evoked by visual ...