The two methods of brain imaging techniques that reveal brain activity are as follows:
- EEG, commonly known as electroencephalogram.
- fMRI, commonly known as functional Magnetic Resonance Imaging.
What is brain activity?
Brain activity may be defined as the capability to carry out a given cognitive or physiological task by the brain with normal intensity. It is considered the physical correlate of mental activity.
EEG directly analyzes and records the brain's electrical activity with the help of electrodes that are placed on the skull of the subject. Brain cells communicate via electrical impulses and thus remain active all the time, even during sleep. This action demonstrates wavy lines on an EEG recording.
fMRI detects the small amount of changes in blood flow that occur with brain activity. This methodology works on the principle of detecting the alterations in blood oxygenation and flow that occur in response to neural activity.
Therefore, it is well described above.
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