| Patient: age / state | Waveform: morphology / frequency | Duration | Distribution | |
| Benign spike-like patterns | ||||
| Small sharp spikes | Adults / drowsiness and light sleep | Monophasic or diphasic spikes | Phase <50 msecs | Bi-hemispheric maximal-anterior / mid temporal |
| Wicket spikes | Adults / drowsiness and light sleep | Sharply contoured arch shaped / 6 to 11 Hz | Few seconds | Bilateral anterior / mid temporal |
| 14- and 6-Hz positive bursts | Children and adolescents / drowsiness and light sleep | Arch shaped positive sharp component / 4-7 Hz and 13-17 Hz range | Less than 1 to 2 seconds | Bilateral posterior temporal / parietal |
| 6 Hz spike and wave | Adolescents and young adults / relaxed wakefulness and drowsiness | Low voltage spike-high amplitude slow wave / 5 to 7 Hz | 1 to 2 seconds | Generalized / at times maximal anterior or posterior |
| Rhythmic patterns with an epileptiform morphology | ||||
| Rhythmic temporal theta bursts of drowsiness | Adolescents and young adults / relaxed wakefulness and drowsiness | Notched flat topped / 5 to 7 Hz | Seconds | Bilateral temporal |
| Subclinical rhythmic EEG discharge in adults | Adults >50 / hyperventilation, drowsiness | Rhythmic sharply contoured / 5 to 6 Hz | 40 to 80 seconds | Bilateral parietal / posterior temporal |
| Midline theta rhythm | Children and adults / awake, drowsy | Sinusoidal, arciform / 5 to 7 Hz | 4 to 20 seconds | Midline, maximal centrally |
