5 thru 8 Flashcards Preview

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Flashcards in 5 thru 8 Deck (38)
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1
Q

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

A

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

D) all of the above

2
Q

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:

A

stronger

3
Q

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

A

differential

4
Q

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

A

microvolts

5
Q

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

A

ohms

6
Q

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

A

power

7
Q

Power is measured in:

A

watts

8
Q

Current that flows continuously in one direction is known as:

A

direct current

9
Q

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

A

alternating current

10
Q

The basic equation for calculating power is:

A

voltage squared divided by resistance

11
Q

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

A

alternating current

12
Q

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

A

in phase

13
Q

Most equipment today measures voltage in _______ format.

A

peak to peak

14
Q

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

A

positive peak to the negative peak

15
Q

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

A

differential

16
Q

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

A

montage.

17
Q

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

A

A) bipolar montage

C) serial montage
****D) both A and C****
18
Q

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

A

same side

19
Q

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

A

3 centimeters

20
Q

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

A

excessive beta

21
Q

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

A

10%

22
Q

The most common source of artifact in EEG is:

A

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

23
Q

Sixty-cycle hum can be reduced by making sure:

A

all outlets are properly grounded.

24
Q

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:

A

monopolar montage

25
Q

Periodic large amplitude spikes in theta may be due to:

A

eyeblinks

26
Q

The best place for the ground electrode is:

A

any place on the head or back of the neck

27
Q

The frequencies most associated with alpha are?

A

8-12

28
Q

The frequencies most associated with beta are?

A

15-30

29
Q

The frequencies most associated with delta are?

A

1-4

30
Q

The frequencies most associated with gamma are?

A

35-45

31
Q

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

A

SMR

32
Q

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

A

a resting frequency

33
Q

Alpha desynchronizes into beta waves during ________ ?

A

cognitive processing

34
Q

__________ is the dominant frequency during sleep?

A

delta

35
Q

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

A

Sheer

36
Q

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

A

higher

37
Q

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

A

beta

38
Q

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 _____________ .

A

sleep spindles