AP PSYCHOLOGY

Detailed explanation-1: -As an individual continues through stage 1 sleep, there is an increase in theta wave activity. Theta waves are even lower frequency (4–7 Hz), higher amplitude brain waves than alpha waves .

Detailed explanation-2: -Stage N2: Theta Waves, Sleep Spindles, and K-Complexes Theta waves are one of the three characterizing traits of stage N2. Although theta waves dominate our brain activity, they are regularly interrupted by sleep spindles.

Detailed explanation-3: -Stage 1. Stage 1, also called N1, is essentially when a person first falls asleep. This stage normally lasts just one to seven minutes. During N1 sleep, the body has not fully relaxed, though the body and brain activities start to slow with periods of brief movements.

Detailed explanation-4: -The wave is characteristic of stage 1 sleep. Solution: The correct answer is Alpha wave. Sleep consists of two cycles, NREM (non-rapid eye movement) and REM (rapid eye movement) cycles. The NREM cycle is divided into 4 stages and the 1st stage is characterized by the presence of alpha waves.

Detailed explanation-5: -As a person transitions from being awake to falling asleep, alpha waves are replaced by theta waves. Sleep spindles and K-complexes emerge in stage 2 sleep. Stage 3 and stage 4 are described as slow-wave sleep that is marked by a predominance of delta waves.