How do you measure the Brainwave Frequencies?

Neurometrics defines the brain’s electrical activity into brainwave frequencies; each one associated to a different psychological activity. The frequency is the number of times per second that a group of neurons produces (or ‘fires’) an electrical impulse; thus transmitting information.
The neural oscillations can be measured with an electroencephalogram (or EEG), which is a medical exam which measures the electrical activity of the brain, similar to how the ECG measures the electrical activity of the heart. The unit of measure is called Hertz; so if we mention a frequency of 15Hz, it simply means that there are 15 impulses per second.

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