STATES OF CONSCIOUSNESS
DREAMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Delta waves
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Beta waves
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Theta waves
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Alpha waves
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Detailed explanation-1: -Alpha waves are seen in the electroencephalogram (EEG) during a normal wakeful state where the subject is quietly resting. Beta EEG are present when a person is alert/attentive and thinking actively. Theta rhythm (Stage 1) of sleep is present during the transition from wakefulness to sleep.
Detailed explanation-2: -In a normal awake person, alpha rhythm is 8–13 Hz activity in the posterior head regions and beta at a frequency >13 Hz is seen in anterior areas. Theta (4–7 Hz) and delta (<4 Hz) are seen during drowsiness and sleep but are abnormal if seen in awake state.
Detailed explanation-3: -Beta (13 to 30Hz): Beta rhythm is the most frequently seen rhythm in normal adults and children.
Detailed explanation-4: -Alpha activity tends to be of highest amplitude over the occipital (visual) cortex of the brain, especially when eyes are closed [7]. The beta band is commonly defined as the EEG rhythms between ∼15 and 25 Hz with amplitude of ∼2–20 µV. Beta EEG activity is most commonly observed during active wakefulness.