Electromagnetic Neuroimaging Methods - Main Ideas

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10 Questions

What are the two main methods used to know when things happen in the brain?


How can signals be decomposed in electromagnetic neuroimaging?

Analyses in frequency domain

What is the electrical component associated with the generation of an electromagnetic field from inner to outer surface in the brain?


What method is used to detect small changes induced by events in EEG recordings?

Event-related potentials

Why do scalp fields not directly reflect which part(s) of the brain give rise to the signals in EEG recordings?

Inverse problem

What are the challenges in uniquely estimating intracerebral sources using EEG?

Smearing/distortion during volume conduction and limited number of electrodes

What are the requirements for an electromagnetic field to be detectable and measurable on the scalp?

The electromagnetic field must be large, requires summated activity of thousands of neurons, and the neurons must be active synchronously.

What is the main difference between EEG and MEG in terms of brain activity detection?

EEG picks up more brain activity than MEG.

How can intracerebral sources sometimes be estimated mathematically?

By relying on other knowledge and making assumptions.

What factors should be considered when choosing a technique to answer a question of interest?

Cost, availability, comfort of the technique, and compatibility with equipment.

Explore the main concepts of electromagnetic neuroimaging methods including MEG recording setups, brain activity analysis in frequency domain, and the latencies of visually-responsive neurons in the brain. Learn about how different brain rhythms are decomposed and the regions of the brain that are active within 100 milliseconds.

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