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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Is there any clinical research data showing EEG changes in epileptiform activity using CBD?

Given that EEG analysis is currently the only real time way of measuring brain activity over time, I am wondering whether or not there has been any testing done in order to show changes in ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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How to chose which filter to design for EEG signal? [closed]

I am currently working on the EEG Grasp Dataset from Kaggle. I am aware that I need to filter the EEG signal as it is visually noisy (is there any way to mathematically show it's noisy?). How do I ...
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Help understanding and visualizing the data from EEG grasp dataset from kaggle

So, I downloaded the EEG grasp data set from kaggle. I am having a hard time understanding the data and plotting it. I extracted the " first subjects' " csv files from the train folder which consists ...
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Active Sources Extraction

I am using the LORETA-KEY software for source localization, which gives as an output the current density of each voxel. No voxel has zero current density, so which method should be used to decide the ...
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Anomalous activation of temporal lobes

The result of wakeful EEG shows persistent activation of temporal lobes - high level of delta and theta waves in the left temporal lobe (3 on the scale from -3 to 3) and slightly lower in the right ...
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Detecting trauma with EEG?

My parent went to a Psychologist because of anxiety and panic attacks. Nicely i knew that she uses EEG for diagnostics. So he went to see her, but he told me that during the EEG she asked him for 2 ...
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Analyzing EEG time-frequency data in a factorial design

I am trying to find the best strategy to analyze a set of EEG time-frequency data from 24 subjects, using 64 electrodes. This is an exploratory study as I have no a-priori hypothesis on where or when ...
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3 votes
2 answers
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correction for multiple comparison over many ROIs

I would like to know how to correct a p value of a stiatistic when the same test was run over multiple regions of interest. The modality is MEG. So, I have 4 Regions Of Interests, and I ran the same ...
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What can combined EEG-fMRI tell us about the brain activity that two separate EEG and fMRI experiments cannot?

I am trying to get my head around what questions I can expect to have answered about brain activity that cannot be answered by doing two separate EEG and fMRI experiments. I am aware that fMRI ...
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How do you denoise and extract features from EEG data with Python?

I have EEG data with 5 columns (1 per each electrode) and I need to denoise it and extract features from it using Python. I tried to find relevant packages but my search kept leading me to MNE which ...
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Is there an upper limit to the number of channels in an EEG system that would provide additional useful data points?

A quick scan of search results seems to indicate that the highest density EEG systems on the market are limited to 256 channels such as Neuvo, SynAmps, and others. Is this an arbitrary limit (either ...
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Can a device create/guide neuron connections between them?

Is there a device of some sort that could promote/guide/create exact connections between neurons? I wish there was a device that could get me PhD by just wearing it for a few months.
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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 ...
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2 votes
1 answer
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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 ...
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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 ...
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Connection problem with PsychoPy to EGI netstation for EEG experiment [closed]

I posted the issue to the PsychoPy forum already, but was wondering if I could get more input from StackExchange. So I’m having difficulty establishing connection between the Psychopy running ...
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I want to find event1 in my EEG data, followed by event2 and then extract reaction time between them

...
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1 answer
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Reference signal when measuring EEG

When performing EEG, a number of electrodes are placed on the scalp to measure the electric potential difference between those locations and a reference. In the unipolar configuration, the reference ...
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2 votes
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Readiness Potential vs. Lateralized Readiness Potential in ERP

Readiness Potential (RP) has been obviously discovered before Lateralized Readiness Potential (LRP). I wonder, is simple RP still used for something today? Is the LRP preferable over RP because of ...
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