When would you see delta waves in an EEG?
Electroencephalography (EEG) is a non-invasive diagnostic technique to measure brain activity. This method is used to measure the electric fields of the brain. This is achieved by placing electrodes on the scalp. These record the voltage potential that arises from the electric flow in the brain neurons. So essentially, EEG measures the brain waves.
There are four types of brain waves, classified on the basis of frequency. These represent different stages in the brain activity.
Beta wave: These have a frequency range of 13-35 Hz and are associated with consciousness and motor activity.
Alpha wave: With a frequency of 7-13 Hz), these waves originate from the occipital lobes and are recorded during wakeful relaxation.
Theta wave: These waves have a low frequency (4-7 Hz) and are associated with drowsiness and low brain activities.
Delta wave: These are the ones with the shortest frequency (0-4 Hz) and is associated with deep sleep.
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