The proper way to score a major body movement-dominated epoch in a recording is described by which of the following?

The proper way to score a major body movement-dominated epoch in a recording is described by which of the following?

• A. If an alpha rhythm is present for part of the epoch, score as stage wake
• B. If no alpha rhythm can be discerned, but an epoch of stage wake either precedes or follows the epoch with a major body movement, score as stage wake
• C. If no alpha rhythm and no stage wake precedes or follows the epoch, score the epoch as the same stage as the epoch that follows it
• D. All of the above statements are true about scoring major body movement epochs

Answer: (D)

Focus here on how to classify a major body movement–dominated epoch. When a movement takes up most of the epoch, the scorer looks for cues that indicate whether the person was actually awake or in a sleep stage. If alpha rhythm is present even for part of the epoch, that alpha activity signals wakefulness, so the epoch is scored as wake despite the movement. If there’s no discernible alpha but a stage wake epoch occurs before or after, the movement-dominated epoch is still scored as wake because the surrounding context shows the person was in a wake state around the movement. If neither alpha nor surrounding wake is detected, you infer the stage from the following epoch and score the movement-dominated epoch as the same stage as what comes next, to preserve consistency with the sleep-wake sequence. That combination of rules is why all of these statements are true for scoring major body movement epochs.

Focus here on how to classify a major body movement–dominated epoch. When a movement takes up most of the epoch, the scorer looks for cues that indicate whether the person was actually awake or in a sleep stage.

If alpha rhythm is present even for part of the epoch, that alpha activity signals wakefulness, so the epoch is scored as wake despite the movement. If there’s no discernible alpha but a stage wake epoch occurs before or after, the movement-dominated epoch is still scored as wake because the surrounding context shows the person was in a wake state around the movement. If neither alpha nor surrounding wake is detected, you infer the stage from the following epoch and score the movement-dominated epoch as the same stage as what comes next, to preserve consistency with the sleep-wake sequence.

That combination of rules is why all of these statements are true for scoring major body movement epochs.