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Exercise 18 Electroencephalography

front 1

EEG

back 1

a record of the electrical activity of the brain

front 2

Delta

back 2

below 4 Hz; slow, large waves; normally seen during deep sleep

front 3

Alpha

back 3

rhythm generally apparent when an individual is in a relaxed, nonattentive state with the eyes closed

front 4

Beta

back 4

correlated to the alert state; usually about 15 to 30 Hz

front 5

Alpha block

back 5

suppression of the alpha rhythm

front 6

Four types of brain lesions that may be determined by EEG studies.

back 6

epileptic foci, infections, tumors, abscesses

front 7

What is the common result of hypoactivity or hyperactivity of the brain neurons?

back 7

unconsciousness

front 8

How was alpha block demonstrated in the laboratory experiment?

back 8

By clapping your hands, which caught the attention of the subjects.

front 9

What was the effect of mental concentration on the brain wave pattern?

back 9

Should have increased the frequency of the brain waves from the level of the alpha rhythm.

front 10

What effect on the brain wave pattern did hyperventilation have?

back 10

Produced a fast, irregular pattern

front 11

Suggest the possible advantages and disadvantages of using electroencephalography in a clinical setting.

back 11

EEG is a useful tool in the clinical setting to assess cerebral activity in generalized brain regions. Because EEG is indirectly recording, via the scalp, the activity of millions of nerve cells simultaneously, it is less effective in assessing the function of very specific regions of the brain.