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] |