Nervous System: Electroencephalography Lab

Question 1

Electroencephalography

Answer 1

Noninvasive method to record electrical
activity of the brain

Question 2

The movement of ions within the ________ generate electrical activity that is recorded as ______ ______ on an _____________.

Answer 2

neurons, brain rhythms, electroencephalogram

Question 3

What is electroencephalography used for?

Answer 3

Used to diagnose conditions such as, epilepsy, sleep disorders, coma, and encephalopathies

Question 4

The absence of brain rhythms is taken as?

Answer 4

clinical evidence of death

Question 5

Certain characteristics of brain rhythms can have a
frequency that varies between?

Answer 5

1 to 30 Hz,

Question 6

Certain characteristics of cycles per sec and an
amplitude that varies between?

Answer 6

5 to 200 microvolts (μV)

Question 7

what are the 4 simple periodic rhythms that are recorded in an electroencephalogram?

Answer 7

alpha, beta,
delta, and theta.

Question 8

Alpha rhythms have a wave frequency range of what?

Answer 8

8 to 13 Hz

Question 9

alpha rhythms are prominent when?

Answer 9

The individual is in a relaxed state with the eyes closed.

Question 10

Alpha rhythms of the
greatest amplitude is recorded over the?

Answer 10

occipital and parietal regions of the cerebral
cortex.

Question 11

T/F: In general, females have a higher alpha wave frequency and wave amplitudes are likely to be higher in extroverted subjects.

Answer 11

True

Question 12

When does alpha block occur?

Answer 12

Occurs if the eyes open or if the individual begins to concentrate on some mental problem or visual stimulus.

Question 13

During alpha block the waves _______ in amplitude but _________ in frequency producing ______ ________.

Answer 13

decrease, increase, beta rhythms

Question 14

T/F: Beta rhythms are closely related to alpha rhythms

Answer 14

True

Question 15

T/F: Beta rhythms have a higher wave frequency (14 to 30 Hz) and have lower wave amplitude compared to alpha rhythms.

Answer 15

True

Question 16

when are Beta rhythms prominent?

Answer 16

They are prominent in an
attentive or alert state

Question 17

T/F: In beta rhythms, During episodes of fright or excitement, the wave frequency increases even more

Answer 17

True

Question 18

Delta rhythms are high-amplitude waves with a frequency of?

Answer 18

4 Hz or less

Question 19

When are delta rhythms observed?

Answer 19

during deep sleep

Question 20

As the subject moves from lighter to deeper stages of
sleep what happens?

Answer 20

alpha rhythms are gradually replaced by delta rhythms.

Question 21

Theta rhythms are large abnormally contoured waves with a frequency of?

Answer 21

4 to 7 Hz.

Question 22

Theta rhythms are normal in ________, they are abnormal in awake ________.

Answer 22

children, adults

Question 23

In times of emotional stress, what types of rhythms are observed?

Answer 23

theta rhythms

Question 24

typical amplitude of alpha rhythms?

Answer 24

20-200 uV

Question 25

typical amplitude of beta rhythms?

Answer 25

5-10 uV

Question 26

typical amplitude of delta rhythms?

Answer 26

20-200uV

Question 27

typical amplitudes of theta rythms

Answer 27

10