Electroencephalogram (EEGs)-
measures electrical activity in the brain by placing electrodes on the scalp. These electrodes detect small electrical changes resulting from the activity of brain cells. These electrical signals are graphed over a period of time, resulting in an EEG.
This data can be used to detect various types of brain disorders, such as epilepsy, or to diagnose other disorders that influence brain activity, such as Alzheimer's. The four basic patterns are alpha waves, beta waves, delta waves, and theta waves.
When a person is awake but relaxed, rhythmical alpha waves are recorded. When the person is physiologically aroused, their EEg pattern shows low amplitude, and fast frequency beta waves.
These beta waves are also found in REM during sleep. As the person moves from light to deep sleep, the occurrence of alpha waves decreases and are replaced by low frequency theta and then by delta waves
Spatial resolution- poor
you cannot see a clear image of the brain on the screen, only see the brain waves it produces
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Practical application- okay
not as expensive as fMRIs, useful for sleep disorders
Functionality- good
we can see direct brain activity- however, because it doesn't filter out specific activity