Our brains are home to millions of nerve cells called neurons, and brainwaves are electrical activity that result from these neurons communicating with each other.
We can measure brainwaves by placing small electrodes on the surface of the scalp and we know that different brainwaves correspond with different psychological states. For example, when we’re asleep or drowsy our brainwaves look different from when we are awake, alert and focused.
Different brainwaves are also associated with psychological symptoms such as anxiety, hyperactivity, impulsivity, inattentiveness, or drowsiness. Excessive fast waves tend to correspond with higher levels of anxiety or hyperactivity and too many slow waves indicate a drop in attention or alertness.