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Questions tagged [meg]

Used for questions about MEG practical use and underlying theory.

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Why can't MEG distinguish EPSPs and IPSPs?

I see this fact stated in many places that discuss the basis of the MEG signal but it's never been made completely clear why MEG can't distinguish IPSPs and EPSPs. Please could someone elaborate? ...
HereItIs's user avatar
0 votes
1 answer
125 views

Difference in MEG and EEG readings

Reading the excellent clear answer from @RobinKramer to Are brain waves electromagnetic waves? I have become very interested in the mechanisms behind the measurement techniques using EEG and MEG. From ...
Chris Rogers's user avatar
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3 votes
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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 ...
Non-chemist_dude's user avatar
1 vote
0 answers
28 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 ...
Lena Pappa's user avatar
3 votes
2 answers
398 views

correction for multiple comparison over many ROIs

I would like to know how to correct a p value of a stiatistic when the same test was run over multiple regions of interest. The modality is MEG. So, I have 4 Regions Of Interests, and I ran the same ...
Sophy's user avatar
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1 vote
1 answer
36 views

MEG from simulated neurons

Given MEG is an approximation of neuronal spiking, are there any models that associate the spiking of simulated neurons to an MEG signal? Ideally, this would be a model with some amount of behaviour (...
Seanny123's user avatar
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1 vote
0 answers
27 views

Does MEG measure the sum of neural activity or the maximum?

According to Wikipedia, neurons give a response that generates a readable MEG signal when they are firing in a relatively synchronized manner and their current carrying dendrites/axons are all aligned....
Seanny123's user avatar
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6 votes
1 answer
598 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 ...
Robin Kramer-ten Have's user avatar
13 votes
8 answers
21k 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?
akm's user avatar
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4 votes
1 answer
47 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?
Sona's user avatar
  • 91
5 votes
2 answers
673 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?
Sona's user avatar
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