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Author Question: Sleep stage 3 is distinguished from sleep stage 4 by the: a. Presence of bursts of theta waves ... (Read 69 times)

lindiwe

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on: Jul 16, 2018
Sleep stage 3 is distinguished from sleep stage 4 by the:
 
  a. Presence of bursts of theta waves
  b. Presence of sleep spindles and k-complexes
  c. Percentage of large delta waves present on the electroencephalogra m
  d. Percentage of relatively low-voltage, mixed-frequency waves

Question 2

What is the distinguishing feature of the electroencephalogra m during sleep stages 3 and 4?
 
  a. Small beta waves c. Sleep spindles
  b. Large k-complexes d. Large delta waves


kbennett34

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: C
The distinction between stage 3 and stage 4 is usually found in the presence of large delta waves, or slow waves. At the beginning of stage 3, delta waves constitute 20 to 50 of the electroen-cephalogram. Stage 4 is identified by the presence of the delta waves for at least 50 of the electroencephalogra m recording.

Answer to Question 2

ANS: D
The deepest stages of non-REM sleep (stages 3 and 4) are referred to as slow-wave sleep because of the presence of large delta waves that appear when the sleeper enters these stages.


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