What are Brainwaves ?
Brainwaves are the sum total of millions of neurons all firing at once.
The number of neurons sparking in the brain at a certain frequency (speed) convey information that defines the amplitude (or power).
Brainwaves are measured in Hertz (waves per second), and have a spectrum of frequencies.
Each frequency spectrum carries a different meaning about emotions, physical movement, concentration, and creative expression and state of consciousnes.
Symptoms or behavioral problems appear when specific frequencies do not fire optimally for a given activity. For example, it is not optimal for beta frequency, the “go” brainwave, to be dominant at night or it causes insomnia. And delta, the “sleep” brainwave causes daytime drowsiness and insomnia during the night if is too active during the day.
The speed of the EEG waveform (brainwaves), measured as the number of times per second that the wave goes from one peak to the next (i.e., cycles per second or Hertz or Hz), reflects the degree of activation of the area of the brain under the electrode.
Slower or lower frequency brainwaves (fewer cycles per second) such as Delta (1-4 Hz), Theta (4-8 Hz) or Alpha (8-12 Hz) brainwaves indicate lowered blood flow (reduced perfusion) and fuel use (glucose uptake) in that part of the brain.
Faster brainwaves such as Beta waves (>12 Hz) show increased brain activity.
These types of brain electrical activity also reflect the level of arousal of the person: Delta activity accompanies deep sleep, Theta activity accompanies states of drowsiness and deep relaxation, Alpha is associated with relaxed but awake states, lower Beta (13-16) is associated with relaxed but attentive focus, middle Beta (15-20 Hz) with an engaged or active stage of mind, and higher Beta (>22 Hz) with an excited, hypervigilant, or urgent/emergency state of mind.