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7-11Hz ALPHA - Central / parietal(c3-c4) - not attenuated with eyes open - attenuate with lateral movement lije clinch fist
POSTERIOR SLOW WAVE OF YOUTH
8 - 14 yrs old - seen up to 20yrs - single, random , irregular Theta / Delta - AMP= moderate and variable - can be intermixed with Alpha
Central /Temporal - Self-limiting syndrome in healthy child - can progress to generalized seizures - considered normal
Symmetrical - central region - max vertes in stage I - seen spontaneously or with stimuli
short bursts of 12-14 Hz STAGE II - age 2-3 months - developmental mark - asynchronous up to 2 years
Alpha attenuation - rolling eyes - decreased EMG - decreased fg and increased duration Theta and Delta
child ages up to adoles - hight voltage (100uv) - bilateral - some what varalble - max over central and frontal
14 Hz and faster - frontal / centeral - depressed over brain lession / burrholes / defects - effect from medication induced coma
Single sharp transients - 4 to 6 Hz theta Occipital - Occurs in scanning, reading image and blocked with eyes closed
NORMAL VARIANTS 14 - 6
14 -6 CYCLES PER SEC. - early adolescence - posterior- Max in T5 - T6 referential ear- drowsy or stage I
BETS - epil transients of sleep
Referential montage, low voltage sharp waves - temporal and frontal - mimic ekg artifact
Phantom spike-wave (6Hz)
low volt spike and wave - Posterior or midparietal - drowsy - stage I sleep
Rhythmic mid-tempral Theta
4 to 7 Hz Theta - temporal and central - drowsiness or relaxed wakefulness
can be seen as a frequency that is a
frequency equal to or an integral
submultiple of the photic frequency.
slow alpha variant
sub-harmonic posterior dominant 4.5 to 5 Hz - wake state - eyes closed / attenuates eyes open
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