Brain Wave Type	Frequency Range
(a) Alpha waves	(i) 4 – 7 Hz
(b) Beta waves	(ii) 14 – 30 Hz
(c) Theta waves	(iii) 8 – 13 Hz
(d) Delta waves	(iv) 0 – 3 Hz

Correct option is A

​

Information Booster:
● Hans Berger first recorded human EEG in 1924, discovering alpha waves and revolutionizing neuroscience methodology.
● Alpha wave suppression (alpha blocking) occurs when eyes open or during mental concentration, replaced by beta activity.
● Theta waves are prominent in children and increase during REM sleep, drowsiness, and certain meditation practices like mindfulness.
● Delta wave activity during waking states may indicate brain pathology, traumatic brain injury, or learning disabilities.
● Beta waves subdivide into low beta (12-15 Hz, relaxed focus), mid beta (15-20 Hz, thinking), and high beta (20-30 Hz, anxiety/stress).
● Neurofeedback therapy utilizes real-time EEG monitoring to train individuals to modify their brain wave patterns for therapeutic purposes.
​