Delta – 1-3 Hz of power spectrum – sleep,dreaming
Alpha 1 – Lower 8-11 Hz of power spectrum
Alpha 2 – Higher 8-11 Hz of power spectrum – very relaxed , passive attention, reflective
Beta 1 – Lower 12-29 Hz of power spectrum
Beta 2 – Anxiety dominant, active, external attention , Busy
Theta – 4-7 Hz of power spectrum – Deeply relaxed, inward focused , drowsiness
Gamma 1,Gamma 2 – Concentration, Problem solving
From Technological Basics of EEG Recording and Operation of Apparatus
Priyanka A. Abhang, ... Suresh C. Mehrotra, in Introduction to EEG- and Speech-Based Emotion Recognition, 2016 – Science direct - https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/brain-waves