Question

the difference between stage 3 and stage 4 sleep is that during stage ____ sleep, ________ waves occur m than 50 percent of the time.
a. 3... delta
b. 4... delta
c. 3... alpha
d. 4... alpha

please select the best answer from the choices provided

○ a
○ b
○ c
○ d

Explanation:

To solve this, we recall sleep stage characteristics. Stage 3 (formerly combined with stage 4 as slow - wave sleep) and stage 4: in stage 4 sleep, delta waves occur more than 50% of the time. Alpha waves are associated with wakeful relaxation, not deep sleep stages 3 - 4. So we eliminate options with alpha (C, D). Between A and B, stage 4 has more than 50% delta waves, so B is correct.

Answer:

B. 4... delta