Electroencephalogram

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created 5 years ago by mmiyakooo
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EEG
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1

What is EEG

electroencephalogram

2

what is EMG

electromyogram

3

what does a EEG do?

records electrical activity of the brain

4

What are the two types of waves

frequency and amplitude

5

how are electrical activities recorded

waves

6

what is frequency?

measures how often a wave repeats

7

what is the range of hertz for frequency?

1-30Hz

8

what is not a range of hertz in frequency

20-100Hz

9

brain wave amplitudes vary from what

20-100uV

10

what is uV

microvolts

11

what is the unit of amplitude?

microvolts

12

what is the unit of frequency

hertz

13

What must alway be present in living brains?

electrical activity

14

The absence of brain activity look like what?

flat line

15

A flat line on a EEG indicates what?

brain death, clinical evidence of death

16

How many types of waves are grouped according to frequency?

4

17

What is the range in Alpha waves?

8-13Hz

18

What is the range in delta waves

less than 4

19

what is the range in theta waves

4-7Hz

20

what is the range in Beta waves?

14-30Hz

21

What waves are most common in deep sleep?

delta waves

22

which wave is the strongest in a resting brain

alpha waves

23

which wave is present and the strongest when the brain is attentive and alert

beta waves

24

which waves are common in children and abnormal in awake adults

theta waves

25

delta waves have the _________ frequency waves

lowest

26

How is a alpha wave produced?

subject has closed eyes and are not concentrating