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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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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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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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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 ...
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109 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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159 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 ...
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38 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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189 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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123 views

EEG data processing: large data file seems empty

We have been running an experiment trying to collect ABR data using the Brainvision EP-PreAmp and Actichamp system. We ran several successful tests with short versions of our experiment, about 10-15 ...
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113 views

What is bispectrum?

I am working on a project that uses EEG signals of the brain to identify emotional states. While surveying the literature, I came across several references where "derived features of bispectrum" are ...
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24 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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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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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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211 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 ...
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145 views

What is a good software/hardware combination for biofeedback monitoring that includes GSR, GSM, HRV, and EEG?

i'm looking for a lab setup for psychological experiments to help people relieve stress better with various auditory and visual stimuli. what i want is a software like brainbay that can use not just ...
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76 views

Detecting signs of dementia in EEG signal

I would like to know, how dementia can be recognized in the EEG signal of patients with dementia. What I have found so far: According to (Henderson et al., 2006) subjects with dementia are ...
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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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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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138 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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158 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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27 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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119 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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41 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 ...
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9 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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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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35 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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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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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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14 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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17 views

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 ...