AP PSYCHOLOGY

Detailed explanation-1: -First EEG measure of REM sleep allows scientists to distinguish dreaming from wakefulness. Summary: Dream or REM sleep is distinguished by rapid eye movement and absence of muscle tone, but electroencephalogram (EEG) recordings are indistinguishable from those of an awake brain.

Detailed explanation-2: -A sleep study may also be called polysomnogram. The basic recordings done during a sleep study may include: Electroencephalography (EEG) . This measures brain wave activity.

Detailed explanation-3: -EEG stands for electroencephalogram. A sleep EEG is a recording of the electrical activity of the brain while you are awake and then asleep. It involves having small discs (electrodes) which record the activity attached to your scalp using paste.

Detailed explanation-4: -Typically, as one goes to sleep, the low-voltage fast EEG pattern of wakefulness gradually gives way to slower frequencies, as NREM sleep goes from stage N1 (decrease in alpha) to stage N2 (spindles, K-complexes) to stage N3 (increasing amplitude and regularity of delta rhythm).

Detailed explanation-5: -There are four sleep stages, including one for rapid eye movement (REM) sleep and three that form non-REM (NREM) sleep. These stages are determined based on an analysis of brain activity during sleep, which shows distinct patterns that characterize each stage.