Rhythm Frequency(waves/sec) Activity Remarks
Delta
up to 4
slowest type of wave but have the highest amplitude (strongest signal)
Common in children under 1year.Association of seizure-like activity found within the brain. W. Grey Walter used delta waves from an EEG to locate brain tumors and lesions causing temporal lobe epilepsy.[5]
Theta 4-7 slow activity Occur during sleep and in young children. not obvious in adults who are awake.
Alpha 8-13 Larger amplitude slower frequency Typical for adults whose eyes are closed and relaxed. Clearest in the occipital lobes.
Beta 12.5 – 30 Smaller amplitude faster frequency multiple and varying frequencies are often associated with active, busy or anxious thinking and active concentration.
Gamma 32-100  During a focal seizure event, maximal gamma rhythm synchrony of interneurons is always observed in the seizure onset zone, and synchrony propagates from the onset zone over the whole epileptogenic zone.[6]