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The frequency of the waves acquired when the person is in an alert and wakeful state is _______

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The frequency of the waves acquired when the person is in an alert and wakeful state is _______

(a) 4 – 8 Hz

(b) 8 – 13 Hz

(c) 13 – 30 Hz

(d) > 30 Hz

The question was posed to me in an online quiz.

My doubt is from Electroencephalography in portion Diagnostic Investigation in Neurology and Cardiology of Clinical Science

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Correct answer is (c) 13 – 30 Hz

Explanation: When a person is alert and properly awake, the waves obtained are beta waves. These waves range from 13 – 20 Hz. The alpha waves (8 – 13 Hz) are obtained when a person is asleep. Theta waves (4 – 8 Hz) are found when the person is sitting idle or in children. Sometimes, these waves are generated when the person is about to fall asleep.  Gamma waves (> 30 Hz) are found when a person is doing an intense mental activity or is multitasking.

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