Duke is exhausted and plops down on the couch. Fifteen minutes after falling asleep, Duke is not awakened by the refrigerator cycling on. He is, however, awakened by his roommate opening the refrigerator door. What type of brain waveforms did Duke display right before being awakened?a. âdelta wavesb. âtheta wavesc. âbeta wavesd. âtheta waves with sleep spindles and K-complexes

theta waves with sleep spindles and K-complexes

Explanation:

K-complexes and sleep kindles are known to be defining brainwaves of stage 2 REM or sleep. Duke has not entered the deep sleep stage or the slow wave sleep stage which are characterized by low frequency and high delta waves. While K-waves are large theta waves that usually occur in response to stimulus such as sound, and hence Duke must have been awakened by the sound of the door.

âtheta waves with sleep spindles and K-complexes

Explanation:

theta waves occurs in stage 1 sleep, higher amplitude, frequency slowing down, more synchronized (firing at same time) 3-7 cycles per second.

Sleep spindle is a high frequency activity appearing on EEG that last for about 1 second, indicating person is truly asleep.

K-complexes are lower frequency higher amplitudes occur, due to picking up on external stimuli.

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