The EEG Tracing of the Patient in the Sleep Laboratory

question 53

Multiple Choice

The EEG tracing of the patient in the sleep laboratory shows that brain waves have slowed to about 1 to 2 cycles per second.In addition,breathing and heart rate have decreased.What stage of sleep is the patient most likely enjoying?

• A)Stage 1.
• B)Stage 2.
• C)Stage 3 or 4.
• D)REM.

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Definitions:

Hit

In cognitive psychology, correctly identifying a stimulus from a set of alternatives in memory tasks; in sports, making successful contact with the target.

Just Noticeable Difference

The minimal change in stimulus intensity required to detect a difference between two stimuli, according to psychophysical research.

Visual Acuity

The sharpness or clarity of vision, often measured by the ability to discern letters or numbers at a given distance according to a standardized chart.

Absolute Threshold

The minimum level of stimulus intensity needed for a stimulus to be perceived or detected at least half the time by an observer.