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Questions tagged [eeg]

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

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Flat channels in EEG data

I recorded EEG data of several subjects and for several sessions per subject. Some of the data looks flat as in figure below. But when I looked into the data, the data appears to be okay.I mean it ...
Hannan Naseem's user avatar
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Is it possible to modify an EEG cap to accomodate fNIRS 'channels'?

I'm doing a project with several students, and we are trying to record EEG and fNIRS data simultaneously. We do have an EEG device, and are looking around our university for fNIRS devices. We ...
AyamGorengPedes's user avatar
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Hanning window size in EEG power spectrum

I must compute the power spectrum density of sleep EEGs. I was told by an experienced scientist that the process goes as follows: Artifact detect/reject the EEG Compute the power spectrum for every 2 ...
lafinur's user avatar
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Facing problem while connecting OpenViBE Acquisition Server with Python

I am trying to connect OpenViBE Acquisition Server with Python (without using OpenViBE Driver). I read the OpenViBE documentation (http://openvibe.inria.fr/how-to-use-labstreaminglayer-in-openvibe/) ...
bhawna's user avatar
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1 vote
1 answer
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Slow-wave EEG artifact removal

If we want to study a sleep EEG signal in any way (e.g. compute its power spectrum), do we need to remove artifacts from the whole EEG signal, or do we simply need to extract those epochs that ...
lafinur's user avatar
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Why can't MEG distinguish EPSPs and IPSPs?

I see this fact stated in many places that discuss the basis of the MEG signal but it's never been made completely clear why MEG can't distinguish IPSPs and EPSPs. Please could someone elaborate? ...
HereItIs's user avatar
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Bias towards lower frequencies in toy EEG

I am currently working on a scientific experiment that involves the Star Wars Force Trainer II, a toy EEG from Neurosky. It has three dry metal electrodes; one active electrode on the forehead, and ...
gabe12345's user avatar
1 vote
1 answer
51 views

Frequency band comparison between two groups

I am a beginner in signal processing. I have two resting eye closed data groups with group 1 having 40 data samples and group 2 having 100 samples. Both are taken from different devices with different ...
Vishwani Singh's user avatar
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Having issue in functional connectivity of difference matrix between patient group and control group

I am following a paper to calculate functional connectivity of difference between MDD (major depressive disorder group) and Control group. I am getting more connectivity in MDD as compared to control ...
Vishwani Singh's user avatar
2 votes
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42 views

How is the noise covariance matrix computed and why is it a good measure of sensor reliability?

When using minimum norm methods for source estimation (in the case of EEG), which is to say going from the signal at the recording sites on the scalp to the signals in source space, i.e. equivalent ...
David Cian's user avatar
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Are there better tools for EEG data visualization than MNE-python?

I've started learning about EEG data analysis (as a data scientist working with python and R on a daily basis) and came across MNE package. I know that it has some tools for visualizing EEG data and I ...
Brzoskwinia's user avatar
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Averaging across electrodes in P300 to make a figure

I have a dataset in which we expect to evoke P300 peaks in an oddball setting. My part of the project considers building a machine learning model to classify whether a participant saw a relevant ...
Smamorti7's user avatar
1 vote
1 answer
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EEGs of 2 individuals really show "...it's literally true — your brain waves are synchronized listening to music." What does this data look like?

From NPR's July 31, 2023 transcript and podcast These scientists explain the power of music to spark awe: "It modulates levels of dopamine, as well as opioids in the brain. Your brain makes ...
uhoh's user avatar
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-1 votes
1 answer
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Why is Electric Artefact still present in my recording?

I carried out EEG and EP studies on a daily basis. I occasionally electric artefact present within my studies, despite having my notch filter applied, low impedance, and subjects well grounded. I ...
user32979's user avatar
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1 answer
363 views

Can an EEG response be phase-locked but not time-locked?

In EEG, there are two commonly encountered notions of linkage between a stimulus and a response, usually encountered in literature surrounding event-related potentials (ERPs) or evoked potentials (EPs)...
David Cian's user avatar
4 votes
1 answer
146 views

How different is the neural activity in different individuals when they are doing the same tasks?

Today, we can measure EEG (or fMRI) in different individuals and use machine learning to predict their thinking. I want to know if the exact neural patterns (fMRI, EGG etc.) are still similar across ...
user1282369's user avatar
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52 views

Getting 8 channel Muse data in EEGlab?

I am trying to do an experiment, can someone tell me if the following makes sense with an Muse 2 that has 4 electrodes: In the first session I am recording the normal 4 channel data doing some ...
Bhaskar Tripathi's user avatar
4 votes
2 answers
120 views

Why does EOG (eye EEG) spike and fall back down when you look to one direction?

Why does EOG (eye EEG) first spike and then immediately fall back down when you look to one direction instead of staying spiked and only falling back down when your eyes go back to neutral? From what ...
Dashiell Rose Bark-Huss's user avatar
1 vote
1 answer
31 views

A website can directly get the location of every electrode of 10-20 system

There is a website about the eeg 10-20 system. When I input the circle of the head and the distance between the inion and nasion, I can directly get the location of every point from Cz or else. But I ...
Tom Almighty's user avatar
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78 views

What is the "reverse-averaging" technique used in Electroencephalography (EEG)?

Im reading about the Bereitschaftspotential or Readiness-potential "discovery" and I see it was done by "reverse-averaging" the ressults of using EEG to measure certain voltage ...
Metadani's user avatar
2 votes
1 answer
66 views

Alpha and Beta waves during BCI Training

I'm using the EPOC X EEG Headset from Emotiv. I was recording the raw EEG data while doing BCI training to "push" a cube on the EmoticBCI application. Going back to the recording after the ...
rayank97's user avatar
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1 answer
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What are the steps to detect ErrP (Error related potentials) in EEG signals?

I have EEG recordings of an experiment. In some of these recordings subject made an error during the experiment. We know these error cause brain to output ErrP signals. I want to detect this. There ...
Enes Kuz's user avatar
3 votes
1 answer
54 views

Are brainwaves from an EEG meaningful measurements?

I realized that research describing the different stages of sleep all rely on the assumption that we can accurately determine the stage of sleep using an EEG. I wondered if brainwaves are anything ...
Clearvision's user avatar
1 vote
1 answer
2k views

What are the differences between bipolar channels and monopolar channels for EEG?

In EEG, each electrode records a biopotential which must be compared to a reference biopotential in order to obtain a channel of measurement. Two types of channels are the so-called bipolar channels ...
David Cian's user avatar
1 vote
1 answer
55 views

Electric communication between single neurons

It is believed that neurons communicate through neurotransmitters, released from multiple synapses and flow to the axon of the next neuron. But has it been shown if a single neuron communicate with a ...
Leo B Neo's user avatar
5 votes
1 answer
3k views

What is the purpose of having both a ground electrode and a reference electrode in EEG setups?

In almost all electroencephalography (EEG) recording setups, there are two auxiliary electrodes in addition to the ones used to record: the ground electrode and the reference electrode. I've so far ...
David Cian's user avatar
3 votes
1 answer
97 views

Why are flat line EEG recordings not perfectly zero microvolt?

I just look at several flat line EEG brain waves and all of them are not exactly at zero microvolt, in the sense there seems to be always a small signal or irregularities to be seen, as well as ...
SnoopyKid's user avatar
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2 votes
1 answer
59 views

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 ...
kabla002's user avatar
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2 votes
1 answer
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Sources on P1/N1 modulation with checkerboard probe

I have been able to find a lot of papers that modulate the P1/N1 component with a visual probe, usually a checkerboard presented parafoveally. I understand the basics of what I am reading, but I would ...
HernanLG's user avatar
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2 votes
1 answer
80 views

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 (...
RandomFellow's user avatar
1 vote
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What could measuring the N400 response to stimuli of inconsistent stereotypes tell us?

I'm working on a project proposal for a class on intergroup relations and thought this might be interesting to observe. Participants would be shown consistent stereotypical video clips (e.g. Asian's ...
M. Erickson's user avatar
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1 answer
127 views

Difference in MEG and EEG readings

Reading the excellent clear answer from @RobinKramer to Are brain waves electromagnetic waves? I have become very interested in the mechanisms behind the measurement techniques using EEG and MEG. From ...
Chris Rogers's user avatar
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1 vote
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206 views

Does brain wave has wave length? [closed]

When I go through Electroencephalography, Band Frequency (Hz) Delta < 4 Theta ≥ 4 and < 8 Alpha ≥ 8 and < 14 Beta ≥ 14 How much are wave ...
kittygirl's user avatar
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1 vote
2 answers
213 views

Why do we use relative signals and not absolute signals with EEG?

Most EEG machines use a system based upon differential amplifiers to enhance the signal, a basic differential amplifier has 2 inputs and one output. the device takes 2 signals and outputs the ...
RhinoPak's user avatar
1 vote
1 answer
67 views

How to handle single trial ERP (P300)

I am learning to work with EEG data in young and elderly subjects. The goal is to find differences in P300 (amplitude & latency) between both age groups during learning. I analyzed the data based ...
Dawid Archibald's user avatar
0 votes
1 answer
278 views

Diagnosis and treatment for Concentration Deficit Disorder?

Sluggish cognitive tempo, sometimes known as Concentration Deficit Disorder, is a syndrome related to (but distinct from) attention deficit hyperactivity disorder (ADHD). Question: What are the best ...
1000000000001's user avatar
2 votes
2 answers
100 views

What are ERP components such as N400?

A lot of research uses ERP, which is time-locked EEG. I am reading about semantic and syntactic anomalies. So when a semantic anomaly occurs there is supposed to be a negative peak in ERP at 400ms. I ...
Borut Flis's user avatar
1 vote
1 answer
33 views

Definitions of the alpha wave in the revised glossary by Clinical Neurophysiology Practice?

I am a novice in EEG, and also not a native speaker of English. I am reading through the article A revised glossary of terms most commonly used by clinical electroencephalographers and updated ...
Yosh's user avatar
  • 113
0 votes
0 answers
34 views

Classifying motor imagery using EEG data

I am an undergraduate student who is trying to classify motor imagery from EEG data! I have no experience working with EEG or any neuroscience background, I only have a very basic knowledge of how ...
Po Chen Liu's user avatar
0 votes
0 answers
63 views

Whole brain death diagnosis and false positive

In view of the increasing need for organ transplants( possibly because of the greater ability of the surgeons and physicians to both execute the transplant, prevent a rejection, and/or diagnose the ...
George Ntoulos's user avatar
2 votes
1 answer
55 views

How can I determine which of Brainwave is dominant as one state by EEG data?

I am a student working on EEGs. I have a EEG data of Brainwave in 4 emotional states, namely anger, sorrow, joy and pleasure. Is there any method for determining the difference between these emotional ...
Q.H.Chu's user avatar
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2 votes
0 answers
24 views

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, ...
Goga Vachnadze's user avatar
2 votes
1 answer
48 views

Has there been any research on the visual uniqueness (in terms of brain activity) of numerals from 0 to 9?

I need to carry out EEG experiments with stimuli being images of 5 digits between 0 and 9. In order to select these 5 digits, I wanted to know if there has been any research work that measures ...
Ajay Subramanian's user avatar
3 votes
0 answers
50 views

How can one detect ACC, PCC or any other medial cortical activity with MEG or EEG if it's inside the brain?

Been reading some research involving various brain imaging techniques and it's not my strong point. Really, if the electrodes or SQUIDS measure surface activity, how does one measure what's going on ...
Non-chemist_dude's user avatar
3 votes
1 answer
53 views

Excluding psychometry and interview methods, is there any physical or molecular method that can confirm mild autism?

ASD is a set of very much heterogeneous symptoms with some common characteristics like lack of eye contact, lack of social guesswork, difficulty in learning unwritten social norms or conventions, ...
user avatar
1 vote
0 answers
32 views

Does EEG biofeedback brain training can cause any harm?

I'm a hobbyist making BCI for biofeedback training. Can I induce any damage to my brain by EEG brain training? For instance, by using wrong training protocols.. Be the way, it would be wonderful if ...
neuromantik's user avatar
0 votes
3 answers
335 views

Why are biosignals from the body said to be continuous?

Whether we talk about EEG, ECG or EKG aren't all these signals discrete as we are reading the voltages from the electrodes that are due to certain bio-chemical or bio-electrical activities. I do not ...
roaibrain's user avatar
  • 129
2 votes
1 answer
49 views

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 ...
kurtkim's user avatar
  • 131
1 vote
3 answers
236 views

EEG analysis free software?

I'm looking for free software for EEG data processing. What free or opensource software packages are available for analyzing raw EEG data?
Sharonas Ykm's user avatar
0 votes
1 answer
40 views

Can a sequence of "automatic" tasks be seen in an EEG?

Say I train a task that consists of a sequence of smaller events a 1000 times such that it becomes an automatic/subconscious (something like muscle memory) movement. Then when I view the EEG signal ...
roaibrain's user avatar
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