Whenever I am thinking about a subject that is not pleasant, in a very short period of time, upon any subject that I ponder very long, attract enough data supporting the evidence and the experience proceeds the thought.

Beta brain wave emited when we are consciously alert, or we feel agitated, tense, afraid, with frequencies ranging from 13 to 60 pulses per second in the Hertz scale

Our mind regulates its activities by electric waves emiting tiny electrochemical impulses of varied frequencies. (Vibrations of thought)