Lab 2: EEG (electroencephalography)

Question 1

alpha wave frequency and amplitude

Answer 1

• 8-13 Hz

- amp: 30-50 uV

Question 2

alpha waves can be seen when…

Answer 2

the eyes are closed and the volunteer is relaxed

Question 3

alpha waves are abolished by

Answer 3

• opening eyes

- mental effort

Question 4

alpha waves are the strongest…

Answer 4

over the occipital and frontal cortex

Question 5

beta wave frequency and amp

Answer 5

• 13-30 Hz

- < 20uV

Question 6

beta waves are prominent in..

Answer 6

alert individuals with their eyes open

Question 7

beta waves maybe absent or reduced…

Answer 7

in areas of cortical damage

Question 8

beta waves can be accentuated by..

Answer 8

sedative-hypnotic drugs

Question 9

theta waves frequency and amp

Answer 9

• 4-8 Hz

- < 30 uV

Question 10

theta waves are seen in..

Answer 10

awake children but NOT adults

Question 11

theta waves are normal

Answer 11

at all ages during sleep

Question 12

theta can be broken down into 2 components

Answer 12

1. low theta - correlates with decreased arousal and increased drowsiness
2. high theta - enhanced with tasks of working memory

Question 13

delta wave frequency and amp

Answer 13

• .5-4 Hz

- 100-200 uV

Question 14

delta waves are NOT seen in…

Answer 14

conscious adults

Question 15

delta waves are a prominent rhythm during..

Answer 15

stages 3 and 4 of the sleep cycle

Question 16

EEG artifacts that produces waves of the same amplitude as delta waves include…

Answer 16

movement of jaw or neck muscles

Question 17

gamma wave frequency

Answer 17

30-50 Hz

Question 18

gamma waves disappear..

Answer 18

when under gen. anesthesia

Question 19

gamma waves may be associated with

Answer 19

higher mental activity such as perception and consciousness

Question 20

interesting fact about gamma waves..

Answer 20

• enhanced in monks during meditation

- lost in schizophrenics

Question 21

EEG waves are an example of…

Answer 21

a graded potential