Stage 1 sleep is characterized by a predominance of which type of wave activity in the brain?

• A. Beta waves
• B. Delta waves
• C. Theta waves
• D. Alpha waves

Answer: (C)

Verified step by step guidance

1. Understand that brain wave activity is categorized by frequency and amplitude, and different sleep stages are associated with specific types of waves.
2. Recall that Beta waves are high-frequency, low-amplitude waves typically seen during active, alert wakefulness.
3. Recognize that Alpha waves are moderate frequency waves associated with relaxed wakefulness, often seen when eyes are closed but the person is awake.
4. Know that Delta waves are low-frequency, high-amplitude waves characteristic of deep sleep stages (Stage 3 and 4).
5. Identify that Stage 1 sleep is primarily characterized by Theta waves, which have a frequency between Alpha and Delta waves, indicating the transition from wakefulness to sleep.