In EEG, delta waves are seen:
Due to reticular system
When the thalamus is cut off from pons
In deep sleep Type
These originate from thalamocortical area
Ans. C. In deep sleep Type Frequency (Hz)LocationNormallyPathologicallyDeltaup to 3frontal, high amplitude (20- 200uV)Adults*deep sleep* infants* subcortical lesions* diffuse lesionsTheta4-7 HzParietal and temporal regions* young children*drowsiness (early sleep)* focal subcortical lesionsAlpha8 -12 HzParietal and occipital (50- 100 uV)* closing the eyes and by relaxation.Frequency decreases in: hypoglycemia, hypothermia, hypercapnia, GA, sleep, comaBeta12 - 30 HzFrontal region; low amplitude waves 10 uV* active, busy or anxious thinking, active concentration* sedatives
Nervous System