Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit 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.

1
vote
0answers
21 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 ...
0
votes
1answer
39 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 ...
1
vote
0answers
16 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 ...
1
vote
0answers
25 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 ...
2
votes
0answers
21 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 ...
2
votes
0answers
34 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 ...
1
vote
0answers
23 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 ...
1
vote
1answer
19 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 ...
2
votes
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.
2
votes
2answers
49 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 ...
2
votes
1answer
88 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 ...
4
votes
0answers
44 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 ...
2
votes
0answers
109 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 ...
1
vote
1answer
25 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 ...
2
votes
1answer
42 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 ...
3
votes
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 ...
3
votes
1answer
653 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 ...
-3
votes
1answer
184 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 ...
3
votes
0answers
36 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 ...
1
vote
0answers
23 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?
2
votes
1answer
169 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 ...
2
votes
0answers
54 views

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

Let's assume that I have a datasheet looking like that: ...
1
vote
1answer
21 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 ...
4
votes
1answer
88 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 ...
2
votes
1answer
72 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. ...
3
votes
1answer
98 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 ...
4
votes
1answer
281 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 ...
3
votes
1answer
251 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 ...
2
votes
0answers
118 views

How to analyse EEG files recorded from Brain Products V-Amp (Brain Vision Recorder)?

I have 3 files recorded from Brain Vision Recorder. They are in the following formats: .eeg .amrk ...
4
votes
0answers
45 views

Splitting EEG signal by marker using BrainVisionAnalyser

I have recorded a long EEG experiment with BrainVision equipment and I want to split it into smaller chunks based on marker numbers. For example, I want to have the chunk of recording between markers ...
3
votes
1answer
80 views

How do I measure ratio of EEG frequency band for a few electrodes in decibels?

I wanted to calculate the ratio of Theta/Beta ($\Theta$/$\beta$) in decibels for a couple of electrodes in AF3 AF4 and Cz I was able to get these in microvolts, but would like to convert them to ...
2
votes
1answer
728 views

Can brain zaps be demonstrated by EEG?

Brain zaps are explained as an electrical buzz in the head and the symptoms occur while withdrawing slowly from an SSRI antidepressant medication. Is it possible to detect brain zaps by placing EEG ...
7
votes
0answers
362 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 ...
4
votes
0answers
100 views

Noise free EEG signal data base

I am working on a research paper regarding EEG signal preprocessing. The first stage includes denoising the signal. However, since I need to evaluate the performance of the method I am using, I ...
3
votes
0answers
52 views

Which filter should be applied to the EEG signal for the stress stimulus? [closed]

I am a student in electrical and electronics engineering. I just started working with EEG. I perform a stress test on subjects and record EEG activities with a 5-sensor headset. I use Matlab for ...
2
votes
0answers
146 views

Window and noverlap values in pwelch function of Matlab

Could anyone please suggest what values to be used for Window and noverlap inputs of pwelch function in Matlab. I am using a 200 ms EEG signal with sampling frequency 1000 (so total samples 200) to ...
8
votes
1answer
110 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 ...
3
votes
1answer
2k views

How to calculate absolute power for EEG from power spectra density?

For example, I have power spectrum density calculated by pwelch ...
3
votes
1answer
143 views

How to denoise and get rid of 1/f trend of a PSD in an EEG synchronization experiment

I'd appreciate some help from you guys. I'm currently analyzing an experiment where I've entrained participants to these frequencies: Condition 1: 4.16Hz-8.33Hz Condition 2: 2.77Hz-8.33Hz ...
2
votes
1answer
312 views

Classification of EEG Signals

I am working on a project related to Brain-Computer Interface & I came across this problem. What are the tools and techniques used to classify the EEG signals which are extracted from the ...
2
votes
1answer
51 views

Why are the ERP amplitudes recorded and analyzed from different software so different in voltage?

Here are the two ERPs from the same study design, though different subjects. The largest amplitude in the 1st one goes up to 25 uv, while only goes up to 6 in the 2nd figure. Differences: The 1st ...
4
votes
2answers
118 views

Does stimulus-independent ERP make sense/ exist?

Is anyone aware of any concept of stimulus independent ERP (an apparent oxymororn, an event related potential that is neither sensory, cognitive nor motor elicited) ...or a procedure that looks ...
3
votes
1answer
40 views

What are the methods to reject ocular artifacts in the EEG?

Is there any way to remove ocular artifacts from an EEG signal, other than applying independent component analysis, or manual rejection?
2
votes
0answers
26 views

Syncing up CPT device with EEG recording

I'm working on setting up an EEG experiment that will be going through a battery of various cognitive tasks. One of the tests is a Continuous Performance Task and to conduct that we'll be using a ...
4
votes
0answers
149 views

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 ...
4
votes
1answer
421 views

What is the meaning of the peak polarity in EEG data?

I wish to define neuronal activities by analyzing the peaks of each channel in EEG signals. Some papers use the negative peaks as a measure of neuronal activity and others deploy the positive peaks. ...
5
votes
1answer
139 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 ...
4
votes
0answers
36 views

Library (or manual creation) of ERP components

I'm looking to test some computational models using ERP components as inputs (eg. p300, n170) I'm wondering if there is an existing library anywhere that would have a bank of wave/component examples ...
5
votes
1answer
409 views

Physiology behind EEG measurements

Many questions were asked about general procedures of Electroencephalography (EEG), which were phrased in a rather specific context. Not only were these questions hard to find, they might also be ...