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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1answer
415 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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0answers
63 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
30 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
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1answer
124 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
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1answer
87 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
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1answer
151 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
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1answer
525 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
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1answer
471 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 ...
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0answers
182 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 ...
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0answers
52 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
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1answer
120 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 ...
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1answer
1k 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 ...
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513 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
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0answers
111 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 ...
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0answers
56 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 ...
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0answers
167 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 ...
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1answer
139 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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1answer
5k views

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

For example, I have power spectrum density calculated by pwelch ...
3
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1answer
327 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 ...
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1answer
506 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 brain using ...
2
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1answer
62 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 ...
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2answers
127 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
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1answer
47 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?
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31 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 ...
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0answers
184 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
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1answer
643 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
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1answer
264 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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0answers
46 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 ...
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1answer
535 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 ...
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308 views

What are other methods for adjusting latency jitter in event-related potentials (ERPs) (P300 in particular) besides Woody filter and peak-picking?

Latency jitter refers to the phenomenon that an ERP component appears at various time in different trials, without adjusting this difference when averaging across trials will lead to diminished ERP (...
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0answers
225 views

Is there a reasonably easy way to get emotions from EEG?

I am building a project to visualise brain data from EEG, specifically emotions. I have found a significant numbers of papers that describe methods that include pre-processing, feature extraction and ...
5
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2answers
161 views

Method/Unit for measuring activity in specific frequency band for EEG

This may be more of a signal processing question but I'm looking to measure and compare activity in different frequency bands for each sensor. Unfortunately, all papers I've looked at simply refer to "...
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4answers
602 views

Isolating stable EEG data across all channels in EEGLAB

I'm working on some EEG data we collected using the Emotiv Epoc headset using 14 channel sensors. I need to isolate chunks of data where all 14 channels are stable (non-noisy) for a given length of ...
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1answer
734 views

How to use EEG on dogs?

I need to take EEG readings on dogs for BCI and seizure prediction research. To do so do I need special equipment? Is there an accepted approach in terms of frequency, electrode size and placement, ...
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8answers
16k views

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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1answer
341 views

Is it possible to read words a person thinking about via EEG headsets?

There are now a number of EEG headsets that can capture bran signals and give you raw EEG data from brain. EPOC Emotiv is one the famous one with I guess 14 channel. Now as the title of this post ...
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0answers
139 views

EEG electrode cluster selection

Is there a good review paper on electrode selection in EEG analysis to avoid the problem of double dipping (Kilner, 2013)? This is a well documented issue in neuroimaging (Kriegeskorte et al, 2009; ...
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1answer
138 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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1answer
3k views

Is there a way to make a DIY EEG?

I have MATLAB. I would like to try out a small EEG project because my field of interest is in neuroscience, however I'm still doing my undergrad.
4
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1answer
44 views

Insensitivity of MEG to inhomogeneous conductivity

Why MEG is not sensitive to inhomogeneous conductivity profile of different brain compartments (scalp,skull and brain) but EEG is sensitive to that?
4
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1answer
107 views

Mapping Sustained Attention on the brain (EEG)

I am doing a study to the effects of sustained attention on Situation Awareness, i.e. how well one perceives and understands the relevant information in their direct environment (in both space and ...
5
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2answers
232 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 ...
3
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1answer
1k views

LAURA/LORETA source localization in Matlab

Is there a Matlab toolbox for doing source localization using LAURA or sLORETA within Matlab (not requiring additional software like LORETA-KEY, etc.)?
5
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1answer
375 views

In what order do you preprocess EEG data?

I am fairly new to EEG research and I am unsure what the best ordering is for preprocessing data. Do you correct for baseline and filter the data before you go on with artifact rejection/correction, ...
3
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1answer
297 views

How do I obtain recordings of the P300 wave of the event-related potential in the EEG?

I am trying to understand how to analyze the ERP (Event-Related Potentials) from EEG recordings and in particular the P300 wave. I have come up with a few questions which I hope you might be able to ...
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1answer
88 views

Do you need to pay an extra $300 to be able to retrieve data from the Emotiv Epoc via the python-emotiv library?

In the Emotiv website, they offer to pay an extra $300 to access "raw EEG data". If I don't pay that, will I still be able to retrieve the EEG data with the python-emotiv library?
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0answers
46 views

Possible links of the dreaming and hypnotic state

Recently I was asked a question that made me stuck: "how does dreaming states and hypnotic state differ?". What available EEG, fMRI and other means of obtaining data on the brain activity show in such ...
4
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2answers
150 views

Introduction or Tutorial on Continuous EEG Collection Procedures and Initial Processing?

Are there any tutorials or introductions (specifically not slides from talks) on the very basic details of EEG data collection and processing? Things like: Discussions of reference systems (montages) ...
5
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2answers
531 views

Component naming of MEG vs. EEG

My question is why we use P and N for naming positive and negative EEG component(for instance N170 or P100) but for MEG data we use M in both case, I mean M170 and M100 in this example?
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1answer
555 views

How can I make a speller with BCI?

I am trying to make a speller with BCI using EEG (SSVEP or P300, whichever is easier). I would be really grateful if someone could give me a plan of action so as to where do I get started and what ...