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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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7 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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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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Why is EEG recording slanted?

Below is an image of the recording from one of my electrodes: Can someone please tell me why the recording is slanted, i remember learning this in my university but forgot about it, i think it was ...
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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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104 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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1answer
28 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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92 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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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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3answers
78 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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53 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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2answers
1k views

How to filter noise in EEG data

I am a computer science student and I'm doing something for a psychology professor. We have EEG data from an experiment where a person was shown 140 images for 2 seconds each. We placed 64 electrodes ...
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1answer
24 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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30 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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1answer
74 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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32 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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57 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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217 views

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 ...
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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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Are brain waves electromagnetic waves?

Depending upon its activity, the brain emits waves, which represent the summation of individual neurons firing. Are these waves electromagnetic waves?
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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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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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41 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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426 views

EEGlab: power spectral density from a single EEG lead

I was trying to get power spectral density of a time-series data. The sleep recording software we use, doesn't allow to export EDF format of an interval, only of the whole record, but it allows to ...
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1answer
118 views

How to map EEG time-series and visualize meditative states frequencies?

I came across this research article "Case Study of Ecstatic Meditation: fMRI and EEG Evidence of Self-Stimulating a Reward System" about the brainwaves when a Yogi went into a meditative level. I ...
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What tools are available for EEG analysis on the R platform?

I'm starting some EEG studies on attention, and would really like to use R for preprocessing (filtering/artifact rejection), visualization, and analysis, but I can find very little in the way of tools....
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23 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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1answer
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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98 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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2answers
57 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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60 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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1answer
34 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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130 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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1answer
323 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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1answer
48 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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27 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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1answer
164 views

How do you form a rationale to justify choice of time windows in ERP analysis?

Event-related potentials (ERPs) can reflect the electrophysiological phenomena behind perception & attention. Often, certain time windows are applied for the analysis of ERP peaks (components). I ...
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1answer
892 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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1answer
98 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
267 views

EEG Alpha waves during eyes open mindfulness training - any research on this subject

I recently conducted an experiment recording EEG during an eyes open mindfulness meditation. I saw a substantial amount of alpha bursts throughout the meditation both in the occipital and frontal ...
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38 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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24 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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1answer
240 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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54 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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1answer
115 views

Importing EGI eeg binary format data into R?

Are there R packages/functions for importing EGI eeg data format into R?
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2answers
411 views

Is there any file format standard for EEG data?

I have started to do some research on EEG analysis. One of the challenging things I have found is the variability on the formats for the EEG files. What do you do when you receive data your software ...
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1answer
24 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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1answer
116 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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1answer
79 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. ...