EEG: NORMAL & NORMAL VARIANTS QUESTIONS WITH CORRECT ANSWERS

Subclinical Rhythmic Electrographic Discharge of Adults (SREDA) CORRECT ANSWER -5-7 Hz, sharp and slow waves with it -40-80 seconds -50+ y/o typically -T5/T6 + posterior regions -drowsiness mostly Alpha Variants CORRECT ANSWER -Slow Alpha Variant: Half the alpha freq -Fast Alpha Variant: Double the alpha freq. -may appear in only 1 hemisphere Alpha CORRECT ANSWER -8-13 Hz -Voltage is avg 50 uV -Non-dominant hemisphere 50% taller -Attenuates w/ eye opening & mental alerting (QNDP?) -Cornea polarity: + -Retina polarity: - Posterior Slow Waves of Youth (PSWY) CORRECT ANSWER -Alpha on top of delta/intermixed -Occipital -Seen in children and young adults-teens/early twenties -Attenuates in eye opening and disappears in sleep (like alpha does) -If Alpha attenuates and delta does not then it is NOT PSWY