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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17 views

Does Human Brain signal of same task in different time have the same characteristics?

I am currently doing some research about human emotion based on EEG classification. I do an experiment in that I show subject a picture about 3 state of emotion and record their EEG signal. I split my ...
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8 views

Surface Laplacian using x and y data

I have eeg data with the channel names and locations in the x and y direction - 2D projection Is this possible to do a surface laplacian on? If not, would it be feasible to use someone elses 3D ...
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Is it possible to use mixed-effect models on averages dataset?

I have an EEG dataset with participant ids and averaged signal to noise ratios for different different conditions and regions. Can I use a mixed effect model for this dataset (e.g., lmm(SNR ~ ...
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25 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 ...
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19 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 ...
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11 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 ...
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21 views

there were markers but shown 'no segments were found ' BrainVision Analyzer, why?

I have a problem with BrainVision Analyzer when doing Eyetracking analysis. I synchronized EEG and Eyetracking data and they had the same markers. When I tried to segment the synchronized data into ...
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39 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 ...
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26 views

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

I am a student working on this brain field. Just like a title , I have a EEG data of Brainwave in 4 Emotion state which is Anger, Sorrow, Joy and Pleasure.. Is there any method I can determine the ...
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22 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, ...
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22 views

Noise in EEG Electrodes

Hello I'm desigining a home-made EEG and I have a question about noise interference in electrodes. I understand that the noise picked up by the electrodes tends to be much larger than the neural ...
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33 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 ...
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26 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 ...
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35 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, ...
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21 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 ...
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87 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 ...
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25 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 ...
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79 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?
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34 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 ...
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32 views

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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38 views

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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25 views

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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59 views

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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23 views

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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120 views

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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124 views

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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42 views

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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193 views

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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26 views

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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29 views

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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62 views

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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114 views

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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84 views

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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143 views

Connection problem with PsychoPy to EGI netstation for EEG experiment

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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32 views

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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67 views

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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35 views

How do I interpret an effect of electrode position in ERP research?

The example I have in my research is that both conditions show greater amplitude and latency in the parietal electrode sites than in the occipital ones. I'm not sure how meaningful this is for my ...
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1k views

What does “diffuse slowing” mean in the context of EEG and Alzheimer's?

Horvath et al. (2018) mention that: The disappearance of posterior dominant alpha rhythm and the diffuse slowing in AD (alzheimer disease) are easily detectable EEG signs for the experienced ...
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420 views

Brain computer interface Final year project [closed]

My professor told me to collect data for the states we want to to use to control the movement of our robot i.e., thinking, meditation and other emotional or physical states using an Emotiv EEG headset ...
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39 views

Inducing error-related negativity

Which tasks induce the strongest error-related negativity? I'm trying to build a classifier that measures EEG signals to detect when a subject observes an error being committed by another subject. It ...
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26 views

Somatosensory evoked potentials

I am wondering what the best EEG recording montage is to use for recording of electrically evoked somatosensory evoked potentials after median nerve stimulation?
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338 views

Doing PCA and ICA analysis on EEG data with 24 channels

I am very new to this type of neuroscience research and I am trying to do some automatic artifact detection. I am having trouble understanding how I should work with my data. I have data recorded from ...
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58 views

Statistic analysis on EEG data - how to deal with it properly?

Let's assume that I have a datasheet looking like that: ...
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26 views

EEG in fMRI: High frequency “deltas” in EEG after gradient artifact removal

EEG was taken inside an fMRI, including ECG, EXG and eye tracking system. Sampling rate was 5000 Hz. Sync box was used. After running Brain Product Analyzer gradient artifact removal (using markers ...
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109 views

Features for blink detection in real-time single channel EEG

I am looking to detect blink events in real-time single channel EEG. Classification of a moving window of samples to determine whether a blink artifact exists requires feature extraction (except when ...
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1answer
84 views

EEG segmentation and denoising which one should done first?

Because of EEG nature, in EEG analysis often researcher use Windowing/segmentation method. As i currently work on sleep study, and in my study i need to analysis EEG data, i came to a problem. ...
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128 views

How do I determine whether my EEG signal needs denoising?

I recently start to work on sleep study. For my research i download sleep EEG data from physionet. The EEG data has 100 HZ sampling rate and was recorded from 2 bipolar EEG site. When i start the ...
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417 views

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 ...
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365 views

Can a bipolar EEG signal be converted to a monopolar (unipolar) one?

I have bipolar EEG signal of Fpz-Cz of EEG sleep data which I have downloaded from physionet. I would like to have Fpz signal for my sleep study. Is there any way I could convert a bipolar EEG signal ...