EEG Exam 1 Questions With Verified Answers

Alpha FMTR - Answer F: 8-13 Hz M: Sinusoidal, waxes & wanes, regular, symmetry & synchronous T: Occipital, spreads to temporal and parietal R: Attenuates with eyes open; accentuates with closed eyes; attenuates in drowse; accentuate in hyperventilation Beta FMTR - Answer F: over 13 Hz M: Sinusoidal, waxes & wanes; beating frequently; low amplitude; symmetrical T: Frontal; generalized; fronto-central; posterior R: Usually in drowse; burr hole in head; anxious; tranquilizers Theta FMTR - Answer F: 4-8 Hz M: Variable amplitude; sometimes notched or arched; occur in runs/bursts T: Temporal R: accentuates during drowse Delta FMTR - Answer F: Less than 4 Hz M: Variable; monomorphic T: Frontal Central (diffuse and varied) R: During stage III sleep' hyperventilation activation Vertex FMTR - Answer F: 4-7 Hz (less than 1/2 second) M: Sharp wave; high amplitude; transient; 70-200 uV T: Central vertex: Cz, C3, C4; can spread to Fz & Fpz R: Drowse, late stage I- stage II; make noise in stage II Sleep spindles FMTR - Answer F: 11-15 Hz M: synchronous & symmetrical; sinusoidal; asynchronous before age 2 T: Cz, C3, C4; can spread to Fz, F3, F4 R: Stage II; maybe stage III K complex FMTR - Answer F: 2 Hz or less (greater than 1/2 second) M: combination of vertex sharp waves & sleep spindles; PSG: wide delta wave T: Cz, Fz R: Stage II sleep Slow Rolling EM FMTR - Answer Stage 1 sleep - Answer *Alpha attenuates *Slow rolling eye movement Increase Beta POSTS Theta accentuates 14+6 SSS RMTD Vertex Stage 2 sleep - Answer K-complex Sleep spindles stage 3 sleep - Answer High amplitude delta 5 seconds` REM - Answer Rapid Eye Movement Low amplitude; mixed frequency Low chin tone Saw tooth waves RMTD - Answer F: 4-8 Hz M: Theta, variable; notched T: Temporal; can be unilateral or bilateral R: Stage I (drowse) SREDA - Answer Subclinical Rhythmic Electrographic Discharges in Adults (Normal) F: 5-7 Hz M: Rhythmic, sharply contoured theta T: widespread fashion; Maximal amplitude occurs over the parietal-posterior temporal head regions and is usually seen bilaterally R: May last from 20 secs to a few minutes (ave. 40-80 secs) 14 & 6 positive spikes - Answer F: 14 + 6 Hz; faster to slower M: Spikes; cone shaped; epiculate with arch shape T: Posterior Temporal R: Stage I (Drowse) BETS/SSS - Answer F: 50 Hz (less than 50 ms) M: small sharp spikes; fast ascending, slow descending; negative; small T: wide spread R: Stage I sleep (drowse); sometimes stage II 6 Hz spike & wave (phantom) - Answer F: Repetition rate of 6 Hz with a frequency range of 5-7 Hz M: Small in amplitude with more prominent slow-wave component (at times the spike may be difficult to see. Brief bursts lasting 1-2 sec T: Occurs mostly in parieto-posterior temporal derivations, but can vary depending on individual. Bursts occur in a bilateral synchronous and diffuse manner R: Occurs mainly during wake and drowsiness, disappears in deeper levels of sleep