This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Gamma waves of REM sleep in sleep cycle are associated with ? 
Select and explain. 
A. Intense attention, B. Subconscious thinking, C. Deep subconscious thinking, D. Deep sleep
A: Intense attention
Answer: A: Intense attention 
Explanation: Ans. A. Intense attentionBeta and gamma waves (20-80Hz) occur spontaneously during REM sleep and waking and are evoked by intense attention, conditioned responses, tasks requiring fine movements and sensory stimulus