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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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8
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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 ...
3
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1answer
3k 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
208 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
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1answer
350 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
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1answer
56 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
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2answers
121 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
42 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
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0answers
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 ...
4
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0answers
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 ...
4
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1answer
480 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
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 ...
4
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0answers
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 ...
5
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1answer
433 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 ...
4
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0answers
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 (...
3
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0answers
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 ...
5
votes
2answers
149 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 "...
1
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4answers
434 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 ...
1
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1answer
557 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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7answers
11k 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?
2
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1answer
299 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 ...
2
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0answers
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; ...
5
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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?
10
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1answer
2k 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
40 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
95 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 ...
4
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2answers
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 ...
3
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1answer
956 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
votes
1answer
286 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
votes
1answer
263 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 ...
1
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1answer
84 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?
2
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0answers
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 ...
4
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2answers
138 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
402 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?
1
vote
1answer
376 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 ...
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2answers
120 views

Conducting brain stimulation at home

Given articles like this, and their associated research {1}, I am developing an interest in transcranial magnetic stimulation (TMS), transcranial direct current stimulation (tDCS), and other forms of ...
3
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0answers
146 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 ...
3
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1answer
277 views

What is the best way to turn EEG scans in to 3D images?

I'm looking for the best way to turn standard EEG scans into 3D images of activity in the brain over the time of scanning, for example like the Glass Brain images or even connectome-style images. I ...
4
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1answer
161 views

Can brainwaves from EEG be used to measure enjoyment of media?

It seems to be very hard to figure out automatically, what content I will enjoy and what content I will not enjoy. Of course, there are methods that require me to sit in front of a computer and press ...
7
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3answers
236 views

Suggestion for wearable EEG headset

We need wearable EEG headset with raw data output accessible from various platforms. I heard that devices like that have commonly the output encoded and available adapters are designed for one or just ...
1
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0answers
290 views

Is there any publicly available algorithms for Neurofeedback using EEG? [closed]

How do these software work? Is there a clear algorithm I can follow to make one by myself? I can make software for Mac, Web and Mobile. I also have two EEG headsets: Emotiv Epoc and Neurosky ...
5
votes
1answer
174 views

Database of EEG signal phenomenon

I'm working on a paper describing the current state of EEG headsets used as computer interfaces. One of the things that is key for building a system using an EEG headset as a controller is having some ...
2
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1answer
54 views

Have EEG signals in auditory speech perception task have ever been analyzed for correlation with auditory stimuli itself?

This can be useful for getting a better grip on understanding the link between actual stimuli, brain processing, and EEG data.
1
vote
1answer
112 views

Are there any studies that were able to localize Fusiform Face Area (FFA) for face processing using EEG source localization algorithms?

I am looking for references where people were able to collect 128-256 channel EEG data during face perception task and the map it onto FFA or OFA using source localization algorithms?
3
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1answer
287 views

How to build a high sensitivity EEG headset for continual monitoring?

After having a conversation with a couple of the more popular "consumer" level EEG makers such as Versus, I have found that their monitoring abilities are either ...
11
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1answer
695 views

What happens in your brain when you see a dinosaur in this stenographic image?

You might have come across stereographic Images like the one shown below (found here): What happens in your brain when you observe the dinosaur? (as you put your face on the image by touching your ...
4
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1answer
65 views

High Density Signal Meaning

When I was reading an article, I found that it describes the EEG signal as a high-density signal. So what is that mean? EMG is high temporal resolution and moderate spatial resolution (...
4
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0answers
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 ...
7
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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 ...
2
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0answers
390 views

Python MNE - reading EEG data from array [closed]

I have EEG data that comes in the form of a 3D numpy array (epoch * channel * timepoint). timepoint is a 256 element array containing each sampled timepoint (1s total, at 256Hz). epoch is an ...
4
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2answers
253 views

Brain-computer interface with EEG: how to name imaginary movement of a non-self object?

I am working on Brain-Computer interfaces. In my project we try to control the movement of a robot in three directions, namely forward, right and left. We have done an EEG experiment where we have ...