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17 votes
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Are brain waves electromagnetic waves?

Short answer Brain waves are not electromagnetic waves. Long answer Measured brain activity, as you already mentioned, is the result of individual neurons firing. The activity exists, in fact, of two ...
Robin Kramer-ten Have's user avatar
12 votes
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Is there a way to make a DIY EEG?

The OpenEEG project has some information for building your own EEG system. Instructables has a "simple" EEG circuit you can build. Note that this is going to be somewhat costly and time consuming ...
K A's user avatar
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11 votes

Are brain waves electromagnetic waves?

Short answer Brainwaves are typically associated with the electroencephalogram, which is a signal mainly composed of potential differences generated in the superficial layers of the brain. Potential ...
AliceD's user avatar
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10 votes

What do brain waves look like under the influence of psilocybin?

Best start here: The entropic brain: a theory of conscious states informed by neuroimaging research with psychedelic drugs (2014). And then here is some more current literature worth exploring: Neural ...
themorewerealize's user avatar
8 votes

Are brain waves electromagnetic waves?

If "brain waves" produce a time-varying electric potential as shown on the EEG, then as far as I know electromagnetic waves are present. I was taught that you cannot have a time varying electric ...
bobby's user avatar
  • 97
8 votes
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Physiology behind EEG measurements

EEG research all started with Hans Berger, who in 1929 reported that brain activity could be recorded by measuring electrical activity on the scalp. Although the notion of ‘brain waves’ that were ...
Robin Kramer-ten Have's user avatar
6 votes
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Mapping Sustained Attention on the brain (EEG)

You should consider using subject-specific alpha channels and frequency ranges. There are differences between individuals in alpha peak frequency. Also the placement of the EEG cap as well as small ...
Ally Berghoff's user avatar
5 votes

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

The P300 wave is a positive deflection in the human event-related potential (ERP). A common experiment in which it is analyzed is the "oddball" paradigm, where a subject detects an occasional target ...
AliceD's user avatar
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5 votes

Getting started with EEG data

If you are considering an alternative to matlab that is free I would recommend octave. If you are on linux you might consider the whole neurodebian. In terms of book I did not find Steve Luck's book ...
HelloWorld's user avatar
5 votes

Does stimulus-independent ERP make sense/ exist?

An ERP is an Event Related Potential, making it inherently connected to an event. Having stimulus/response independent ERPs is thus impossible. There do exist potentials that seem to be stimulus ...
Robin Kramer-ten Have's user avatar
4 votes
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Brain-computer interface with EEG: how to name imaginary movement of a non-self object?

As far as I know, brain-computer interfaces based on EEG use motor-cortex responses by asking the subject to imagine body movements. E.g., a left-arm movement imagination would translate to moving the ...
AliceD's user avatar
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4 votes
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In what order do you preprocess EEG data?

You kind of have to do some kind of baseline correction first (or a highpass filter on the unepoched data) because of slow drifting. Lowpass filtering before artifact rejection is fine as long as you ...
K A's user avatar
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4 votes

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

Short answer The peak polarity of an EEG is arbitrary. Background Positive and negative in an EEG measure is arbitrary. If you measure the EEG between two electrodes and you flip the wires, the ...
AliceD's user avatar
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4 votes

Does stimulus-independent ERP make sense/ exist?

Resting state EEG protocols already exist, but they do not focus on ERPs (thus solving your problem). You can assess coherence between pairs of electrodes (if you enter 'resting state EEG' into google ...
Ana's user avatar
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4 votes
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How to calculate absolute power for EEG from power spectra density?

I had to do some searching to be able to answer this question. As a matter of fact, a similar questions was once asked on Signal Processing. To make the explanation more laymen-like, I think the ...
Robin Kramer-ten Have's user avatar
4 votes
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What does "diffuse slowing" mean in the context of EEG and Alzheimer's?

Medscape defines diffuse as generalized, in the context of EEG. Generalized means activity recorded across large portions of the cortex. This opposes focal patterns, that occur locally. In turn this ...
AliceD's user avatar
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4 votes

Why are biosignals from the body said to be continuous?

Biological signals are analogues and hence continuous. Early EEG systems simply recorded the analogue signals and displayed it as a continuous signal graphically as wiggly lines written by little pens ...
AliceD's user avatar
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4 votes
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What are ERP components such as N400?

The semantic N400 and syntactic P600 are some of the most well established ERP components in the literature. They were discovered decades ago and the results have been replicated hundreds of times in ...
Alxmrphi's user avatar
  • 181
3 votes

How do you form a rationale to justify choice of time windows in ERP analysis?

Short answer Electrophysiological responses in general often come in waveforms. These are characterized by a number of peaks and troughs. Dependent on the specific response, arbitrary naming ...
AliceD's user avatar
  • 20.7k
3 votes

Importing EGI eeg binary format data into R?

While the available R packages for EEG do not seem to support the EGI eeg data format (see Robin Kramer's comment), you might want to try MNE-Python as a free and open alternative to any EEG toolbox ...
S.A.'s user avatar
  • 310
3 votes

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

I think the question whether this experiment will give you useful data can be split into two parts: Does the EEG reflect the emotional state ? Does the stimulus (media,pictures) induce such an ...
awakenting's user avatar
3 votes

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

I agree with Christiaan. Similar movements are stored nearby and are thus difficult to distinguish (see How are movements stored in the brain? ), even more so with the spatial resolution of EEG. What ...
Robin Kramer-ten Have's user avatar
3 votes
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Dependency EEG signals from regions of the brain

The EEG signals between these regions will not be independent. The electrical activity that is being measured at the scalp, is the result of electrical flow inside the brain. This flow does not go in ...
Robin Kramer-ten Have's user avatar
3 votes

What tools are available for EEG analysis on the R platform?

For the sake of completeness: eegkit, see https://cran.r-project.org/web/packages/eegkit/index.html For "historical purposes" perhaps the following could also be of interest, although development ...
Tiberius's user avatar
  • 186
3 votes

What tools are available for EEG analysis on the R platform?

I was searching for alternative when I fell on this post. Here are a few others eegUtils , the same author has a blog that might be of interest to you for further reading here I also found eegAnalysis ...
Patrick's user avatar
  • 151
3 votes

Classification of EEG Signals

BCI has rougly two different approaches to extract features. I will address them both. When EEG is recorded, you can see an pattern of activity in a particular channel over time. This is the time-...
Robin Kramer-ten Have's user avatar
3 votes
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Doing PCA and ICA analysis on EEG data with 24 channels

First of all, I would recommend working with a domain specific (EEG) and established analysis package of your choice. You mentioned python, so I would advise you to check out MNE-Python. There is a ...
S.A.'s user avatar
  • 310

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