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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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15
votes
3answers
970 views

Is there a better way to describe brain activity than EEG “brain waves”

I've been reading about EEG brain waves, which are specific waveforms that are observed on the EEG output, and are usually scored by humans. This concept has been around for quite some time. Is there ...
11
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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?
11
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2answers
5k views

What is the standard way to analyze EEG data in a mismatch negativity paradigm?

I'm running an EEG experiment using a modified auditory mismatch negativity (MMN) design, and I'm wondering if anyone can tell me the best method for data analysis (and recommend any stats programs/...
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 ...
11
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2answers
567 views

What computerized EEG analysis algorithms are there?

I got a commercial-grade EEG headband and am trying to look at the data it outputs. The headband quantifies raw EEG signal from a single forehead dry sensor into a range of EEG bands (alpha, beta, etc)...
11
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1answer
202 views

Is there a report of a successfully EEG-Based Brain-Computer Interface (BCI) using image training?

Currently I am involved in constructing an EEG-Based BCI. The goal of the BCI is to control which light in a series of lightbulbs lights up. The plan is to use different images (i.e. a flower versus ...
10
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3answers
3k views

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....
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.
9
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5answers
532 views

Are there any EEG procedures currently available/in development that can formulate letters/words from deliberate, internal monologue?

I am thinking of the combination of an EEG-like device and software to monitor and analyze (very) deliberate thoughts of letters/words. The input would be in the form of raw electrical brain ...
9
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1answer
513 views

How does glial cell activity influence fMRI, EEG signals?

Glial cells comprise about 80% of the cells in the human brain. But physiological models of EEG and fMRI often relate only to neuronal activity. How do glial cells affect large-scale imaging ...
9
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1answer
147 views

What are some good references for preprocessing and analysis of the P300 response from EEG data in Python?

I have just started to work on problems in neuroscience on my own. I sought to analyze the P300 response from EEG data because I was trying to understand a Kaggle.com challenge that used it. I found ...
8
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2answers
5k views

Devices that detect when someone is falling asleep

I'm wondering what types of devices exist that can detect how close someone is to falling asleep. I have heard of several devices that may be able to do this, but I haven't been able to find very ...
8
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1answer
466 views

Removing ocular artifacts from EEG signals

I have read the following paper , which is try to remove EOG artifacts from EEG signal , the authors give the following figure . The authors claim that components 1 and 2 represent electro-...
8
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1answer
2k views

Do alpha waves vanish when I open my eyes in a dark room?

Alpha brain waves show up in your EEG when you close your eyes. Do they vanish when I open my eyes in a dark room? To put it in a different way: Is it necessary to have your eyes shut or that you ...
8
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1answer
119 views

Is there a metric of the overall excitation of the brain or nervous system?

I'm thinking of a way to describe what's happening to a single channel EEG/MEG sensor output. I've noticed that there is significant difference in the readings from a quiet observations, versus a ...
8
votes
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 ...
8
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0answers
427 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 ...
7
votes
1answer
341 views

What are proper EEG frequency bands and electrode placements for imagined speech?

I am doing an EEG experiment about imagined speech recognition. Which frequencies will have the most relevant information? I chose the frequency band [4-40] Hz as a start, mainly because of signal ...
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 ...
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 ...
7
votes
1answer
144 views

How does the alpha brain wave frequency range distribute over the population?

Alpha brain waves show up in your EEG when you close your eyes. Alpha waves are brain waves between 8 and 13 Hz. How does this frequency range distribute over a population of people?
7
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2answers
1k views

EEG correlates of handedness

Can any one suggest a good article about features of EEG of left-handed people? I was surprised when find that there are only few old articles about it. I find only one new article by Propper, Ruth ...
7
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1answer
66 views

Effectiveness of implicit measures of deception (e.g., sweating, eye focus, EEG) when filling out online questionnaire

I'm working in my master thesis on a method of detecting user deception or lying when answering online questionnaires using his implicit feedback like sweating, eye focus, EEG etc. I would like if ...
7
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1answer
508 views

What cognitively interesting event-related potentials at FP1, FP2, TP9 or TP10 can be measured with consumer-grade EEG hardware?

I'm looking for cognitively interesting event-related potentials at places like FP1, FP2, TP9 or TP10 that can be measured with consumer-grade EEG hardware. Right now I have an Interaxon Muse EEG and ...
7
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1answer
255 views

Phase locking value (PLV) between $x(t)$ and $x(t-T)$

I have been trying to calculate PLV using the hilbert transform (reference). To test if it even works or not, I calculated PLV between $x(t)$ and $x(t-T)$. i find that it drops to zero very quickly as ...
6
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4answers
856 views

Getting started with EEG data

I want to get started with getting signals from EEG and learning on how I can read data. I have some programming skills, so designing a database and manipulating data with ruby (python seems also cool,...
6
votes
1answer
2k views

How is the signal-to-noise ratio of an event-related-potential measured?

I often encounter publications where the authors try to "increase the SNR (signal-to-noise ratio) of electroencephalogram (EEG) signals". Some define a numeric value of SNR of EEG signals, but I am ...
6
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1answer
237 views

Intro to EEG - Electroencephalography [duplicate]

Are there any introductory level text, researches or video for "How to learn EEG"? Those material should include dictionary of terms, what waves mean, how to connect some activity in waves to brain ...
6
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2answers
300 views

Are there useful applications for three channel consumer EEG?

I stumbled upon the consumer EEG Melon (at Kickstarter). It has three electrodes and is advertised as measuring how "focused" you are. In the FAQ it says: The Melon headband has three electrodes. ...
6
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1answer
216 views

Significant baseline, Oddball paradigm

I recently conducted an EEG experiment using a passive Oddball paradigm with two experimental conditions : standard stimuli (occurring with a 85% probability) and deviant stimuli (occurring with a 15% ...
6
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1answer
162 views

How to analyze auditory steady state responses?

How does one usually go about analyzing the auditory steady state response (ASSR)? I have data where speech was amplitude modulated to a 40 Hz sine tone. There's 3.5 minutes of data; should I just ...
5
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2answers
269 views

How can surprise be labelled conscious when mismatch negativity shows that surprise takes place earlier than conscious states?

Mismatch negativity (MMN) is the brain response to violations of a rule. The MMN peaks at about 100–250 ms after change onset. If MMN occurs so early, before conscious perception, why is surprise ...
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 ...
5
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2answers
401 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?
5
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1answer
847 views

Is it possible to detect the mental flow state with EEG?

I know that it is possible to detect "focus" with a consumer EEG with a single electrode and a reference point (ear clip), even without conductive gel, but is it possible to detect a flow state with ...
5
votes
2answers
412 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 ...
5
votes
1answer
210 views

Are recent affordable EEG devices any good?

I'm looking to do some research about flow and optimal experience with EEG. I don't have access to a lab and I was wondering if the new devices that are available to the public (i.e. Melon, Muse, ...
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, ...
5
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1answer
334 views

Can tinnitus be measured with EEG or MEG?

Can tinnitus be measured with EEG or MEG (magnetoencephalography)? Is it visible in a power spectrum? In an ERP/ERF?
5
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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 ...
5
votes
1answer
115 views

Importing EGI eeg binary format data into R?

Are there R packages/functions for importing EGI eeg data format into R?
5
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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 ...
5
votes
1answer
108 views

Neurophysiological indications of focus and motivation

Is there any way to detect a subject being focused or highly motivated (assuming that these two states are essentially the same) using any sort of external detection, such as fMRI or EEG? How would ...
5
votes
1answer
75 views

Dependency EEG signals from regions of the brain

When we record an EEG signals, we apply an ICA on it. This algorithm assumes that the sources of signals are independent. Could I assume that each region in the brain works independently, i.e., the ...
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 "...
5
votes
2answers
432 views

Measurement of phase difference between two signals using cross correlation vs. fourier transform

I am studying eeg signals with the aim of distinguishing between preictal and interictal epilepsy states based on the eeg signal. I have read some papers and one of the metrics used to distinguish ...
4
votes
1answer
311 views

Is EEG brain-computer interface reliable?

I am a computer science student [assume I have very little knowledge of the biological part of EEG]. I recently came across the topic EEG and was pretty interested in it. As far as I know, we get an ...
4
votes
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 ...
4
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1answer
578 views

Why is the order of brainwaves not labelled “alphabetically”?

The brainwave - frequency breakdown is as follows: Delta wave – (0.1 – 3 Hz) Theta wave – (4 – 7 Hz) Alpha wave – (8 – 15 Hz) Mu wave – (7.5 – 12.5 Hz) SMR wave – (12.5 – 15.5 Hz) Beta wave – (16 – ...
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 ...