Answer: Theta wave activity
Explanation: Theta waves are brain waves with a frequency 3 to 8 Hz which occur most often during sleep. They are also quite prominent in deep meditation and in situations where individuals listen to rhythmic drumming (such as shamanic activities and so on). Theta waves have been shown to enhance learning, memory, and intuition; allowing both the body and mind to experience enhanced rejuvenation, growth, and healing due to the deep level of relaxation they induce.
