5 thru 8

Question 1

The purpose of electrode paste is to make a good connection between scalp and electrode so that:

Answer 1

A) electrons flow easily
B) resistance is low
C) the electrode stays in place

D) all of the above

Question 2

Amplifiers, which are sensitive to microvolts, tend to pick up other signals, such as muscle artifact, which is often in the millivolt range and therefore:

Answer 2

stronger

Question 3

A device known as a ______ amplifier is used to reject unwanted signals.

Answer 3

differential

Question 4

The difference in EEG electrical potential measured between the ground and the other leads is measured in units known as:

Answer 4

microvolts

Question 5

The resistance to the flow of electrons is usually measured in:

Answer 5

ohms

Question 6

The term that refers to the actual energy available in an electrical current is:

Answer 6

power

Question 7

Power is measured in:

Answer 7

watts

Question 8

Current that flows continuously in one direction is known as:

Answer 8

direct current

Question 9

The kind of current found in a common household outlet is known as:

Answer 9

alternating current

Question 10

The basic equation for calculating power is:

Answer 10

voltage squared divided by resistance

Question 11

EEG is a form of _____ because it has a positive and a negative phase.

Answer 11

alternating current

Question 12

Two wave forms which shift from positive to negative at exactly the same rate are said to be:

Answer 12

in phase

Question 13

Most equipment today measures voltage in _______ format.

Answer 13

peak to peak

Question 14

Peak to peak measures voltage from the _____ of the voltage cycle.

Answer 14

positive peak to the negative peak

Question 15

A device known as a _____ amplifier is used to reject unwanted signals.

Answer 15

differential

Question 16

A particular method of placing electrodes on the scalp is referred to as a:

Answer 16

montage.

Question 17

A montage where the ground is placed on one ear and the active and reference leads are placed at different locations on the scalp is referred to as a

Answer 17

A) bipolar montage

C) serial montage
****D) both A and C****

Question 18

When using two EEG amplifiers, one usually hooks up the reference and active lead of each amplifier to the __________ of the cortex.

Answer 18

same side

Question 19

According to Nunez there is an apparently ________ circle of error around 10-20 sites with respect to anatomical locations beneath the scalp.

Answer 19

3 centimeters

Question 20

If individuals are not sufficiently relaxed, they may generate _____ in the EEG.

Answer 20

excessive beta

Question 21

There is approximately a _____ variance, on average, between any given point on the 10-20 system and the area of the brain beneath it.

Answer 21

10%

Question 22

The most common source of artifact in EEG is:

Answer 22

A) clenching the jaw
B) eye movement
C) swallowing
D) all of the above

Question 23

Sixty-cycle hum can be reduced by making sure:

Answer 23

all outlets are properly grounded.

Question 24

A montage involving an active lead on the scalp, a referential lead on one ear, and a ground lead on another ear is referred to as a:

Answer 24

monopolar montage

Question 25

Periodic large amplitude spikes in theta may be due to:

Answer 25

eyeblinks

Question 26

The best place for the ground electrode is:

Answer 26

any place on the head or back of the neck

Question 27

The frequencies most associated with alpha are?

Answer 27

8-12

Question 28

The frequencies most associated with beta are?

Answer 28

15-30

Question 29

The frequencies most associated with delta are?

Answer 29

1-4

Question 30

The frequencies most associated with gamma are?

Answer 30

35-45

Question 31

A 14 Hz rhythm that indicates thalamic gating and which occurs over the sensory motor strip is known as?

Answer 31

SMR

Question 32

Alpha is associated with attentional shifts and is considered ____________ for the brain.

Answer 32

a resting frequency

Question 33

Alpha desynchronizes into beta waves during ________ ?

Answer 33

cognitive processing

Question 34

__________ is the dominant frequency during sleep?

Answer 34

delta

Question 35

40 Hz rhythms associated with learning become known as _______ rhythms?

Answer 35

Sheer

Question 36

The brain requires greater amounts of energy and higher metabolism to generate ________ frequency waves.

Answer 36

higher

Question 37

When the brain is learning a new task it is more active and generates more _______.

Answer 37

beta

Question 38

When EEG spindles in the 11-15 Hz range begin to appear consistently in client’s EEG during training, then it is likely that you are seeing _____________ .

Answer 38

sleep spindles