Psychology and Neuroscience Stack Exchange
Psychology and Neuroscience Stack Exchange

Questions tagged [eeg]

Electroencephalography (EEG) is the recording of the brain's spontaneous electrical activity electrical activity from multiple electrodes placed on the scalp.

Electroencephalography (EEG) is the recording of electrical activity along the scalp. EEG measures voltage fluctuations resulting from ionic current flows within the neurons of the brain. In clinical contexts, EEG refers to the recording of the brain's spontaneous electrical activity over a short period of time, usually 20–40 minutes, as recorded from multiple electrodes placed on the scalp.

Source: Wikipedia

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Are there any EEG procedures currently available/in development that can formulate letters/words from deliberate, internal monologue?

I am thinking of the combination of an EEG-like device and software to monitor and analyze (very) deliberate thoughts of letters/words. The input would be in the form of raw electrical brain activity from the EEG and the output from the software…
Steven Huang
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Removing ocular artifacts from EEG signals

I have read the following paper , which is try to remove EOG artifacts from EEG signal , the authors give the following figure . The authors claim that components 1 and 2 represent electro-oculographic (EOG) artifacts. This is because its scalp…
Learner
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Phase locking value (PLV) between $x(t)$ and $x(t-T)$

I have been trying to calculate PLV using the hilbert transform (reference). To test if it even works or not, I calculated PLV between $x(t)$ and $x(t-T)$. i find that it drops to zero very quickly as $T$ becomes nonzero as shown in following…
morpheus
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How does the alpha brain wave frequency range distribute over the population?

Alpha brain waves show up in your EEG when you close your eyes. Alpha waves are brain waves between 8 and 13 Hz. How does this frequency range distribute over a population of people?
draks ...
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EEG Signal quality

I'm a EEG hobbyist using Olimex EEG SMT, and I'm using 4 dry, active electrodes to record EEG signals (the Olimex uses bipolar montage, so I actually have 2 channels). However, I cannot measure any waves apart from eye movement and hand/leg…
lytex
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Intrinsic relevance of ERP polarity: 'negativity' vs 'positivity'

I know that polarity in a EEG signal is arbitrary, and a matter of convention, as clearly explained in this past question. However, assuming said conventions are well-followed, I wonder whether is there any intrinsic meaning at all to a particular…
z8080
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Why are EEG markers usually sent over the parallel port?

Usually, a study participant is viewing stimuli on a computer screen while their EEG is recorded through the hardware provided by a manufacturer. To later synchronize the EEG data to stimuli, an experimenter will send so-called 'markers' from the…
S.A.
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Is it possible to send event markers via Emotiv epoc using Inquisit 5?

I am trying to employ Emotiv for my research project. Emotiv is a mobile EEG instrument (click here to see more) Unlike other EEG recording systems, I am not able to send a marker to the EEG recording using TestBench. Although the manual of…
Edward Ho
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Can a person control their brain's electrical activity?

In a brain-computer interface paper, I found the following paragraph: Effective assessment of BCI performance requires two levels of evaluation: the user and the system. The user must control the signal features ..." My question is how can a…
Learner
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Can you get 1.5 mm DIN connectors for EEG in the USA If you're not affiliated with a hospital?

I'm trying to find 1.5 mm DIN touchless connectors that would plugin to an EEG like this one (https://neuro.natus.com/products-services/xltek-brain-monitor-eeg-amplifier). I just want the connector that I can solder my own wire onto. I found one…
kabla002
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In EEG recording, why ERD or ERS are not phase-locked wheras Bereitschaftspotential is?

I guess this question is for experts of the domain, but anyway, maybe someone can answer it. So in EEG recording ERD and ERS (event related (de)synchronizition) designate short amplitude attenuation (or augmentation) of rythms within the alpha…
RandomFellow
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Purchasing and Using Encephalogram (EEG)

I am going to purchase an EEG and conduct a series of studies for my MA work. Unfortunately, I come from an undeveloped country so I never had a chance to learn how to use it. I have a few questions, please, explain to me like I am five: What are…
Goga Vachnadze
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The strange shape of the temporal generalization map

We are plotting the temporal generalization map (binary decoding) using EEG signal, but we obtained a strange result and don’t know how to interpret it. First, after bandpass filter (8-12 Hz), we could obtain a normal result as below. As shown…
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EEG Equipment For High Schoolers?

I am doing a research project for school, and I'm trying to investigate the effectiveness of inhaling lavender oil in reducing anxiety. I plan to measure the strength of alpha wave activities, as it seems to be commonly accepted as an index for the…
Rummy Tum-Tums
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Amount of noise in (the recognisable definition of) an ERP

As I understand it, ERPs can be reliably identified only after the noise (inherent to EEG signals, regardless of the task used to evoke the response) has been largely removed, which is done by averaging across multiple repetitions. The ERP in that…
z8080
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