Table 1.

Electrical characteristics of significant brainwaves

Brainwave	Frequency range (Hz)	Amplitude (μV)	Mental function
$\delta$	0–4	10–100	Unconsciousness during a deep dreamless sleep
			During a deep dreamless sleep
$\theta$	4–8	10–50	Subconscious mind
			Focused attention
			Emotion responses
$\alpha$	8–12	5–25	Relaxed mental state
$\beta 1$	12–16	0.1–1	Intense focused mental activity
$\beta 2$	16–30	< 0.1	Anxious alert
$\gamma$	30–99	≪ 0.1	Hyper brain activity

Amplitude values measured during data collections