Cerebral EEG

Question 0

Alpha frequencies

Answer 0

(8-13 Hz)

Assoc. w/ relaxed wakefulness

Question 1

Beta frequency

Answer 1

13-30Hz

Smallest amplitude EEG; assoc w/ mental activity, REM sleep

Question 2

Theta frequencies

Answer 2

4-8Hz

Prominent in young adults; observed during drowsy states

Question 3

Delta Frequencies

Answer 3

.5-3.5Hz

Large amplitude; assoc. w/ non-REM sleep

Question 4

Extracellular field potentials

Answer 4

Changes in extracellular potential due to current sinks and sources

Measured by EEG

Question 5

EEG amplitude

Answer 5

Determined by the degree of synchronization of neuronal firing

-Very active but unsynchronized => high frequency, low amplitude

Can create dipoles of spatially separated positive and negative charge

Question 6

Auditory Deflections

Answer 6

Early- Brain stem processing; small amplitude

Late- Cortical processing; large amplitude

Question 7

Simple Partial Seizure

Answer 7

Patient remains conscious; experiences inexplicable emotions

Question 8

Complex partial seizure

Answer 8

Patient loses some consciousness; experiences automatisms

Question 9

Automatisms

Answer 9

Repeated twitches; especially of the eyes or mouth

Question 10

Secondary generalization

Answer 10

Partial seizure that spreads to other areas

Question 11

Absence Seizure

Answer 11

General seizure where pt. appears to be staring off into space and randomly twitching

Question 12

Tonic Seizure

Answer 12

Generalized seizure causing stiffening of muscles; particularly in the extremities

Question 13

Clonic Seizures

Answer 13

Generalized seizure w/ repetitive jerking movements of muscles

Question 14

Atonic Seizures

Answer 14

Generalized seizures causing a loss of muscle tone; pt. usually falls down

Question 15

Common cause of epilepsy

Answer 15

Imbalance b/w synaptic excitation & inhibition

Question 16

Interical paroxysms

Answer 16

Periods of abnormal, synchronized discharges b/w seizures

Question 17

Postictal depression

Answer 17

Period of disorientation w/ altered EEG following a seizure

-Decreased background amplitude noted on EEG

Question 18

Anitepileptic medications

Answer 18

Enhance effectiveness of GABA NT; also decrease ability of neurons to generate repetitive APs