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Physiology

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Central Nervous System

Question
1 out of 5
 

In EEG, delta waves are seen: (AIPG 2007)



A Due to reticular system

B When the thalamus is cut off from pons

C In deep sleep

D These originate from thalamocortical area

Ans. C In deep sleep

Type

Frequency (Hz)

Location

Normally

Pathologically

Delta

up to 3

frontal, high amplitude (20-200 μV)

adults

deep sleep

infants

subcortical lesions diffuse lesions

Theta

4 - 7 Hz

Parietal and temporal regions

young children

drowsiness(early sleep)

focal subcortical lesions

Alpha

8 - 12 Hz

Parietal and occipital(50-100 μV)

closing the eyes and by relaxation.

Frequency decreases in : hypoglycemia, hypothermia, hypercapnia,GA,sleep,coma

Beta

12 - 30 Hz

Frontal region; low amplitude waves 10 μV

active, busy or anxious thinking, active concentration

sedatives