This Image Depicts the Sleep Cycles Over the Course of a Typical

question 25

Multiple Choice

This image depicts the sleep cycles over the course of a typical night. In which stage does the brain become much more active, and heart rate, blood pressure, and respirations shift up and down, sometimes extremely?

• A)stage 1 NREM
• B)stage 2 NREM
• C)REM sleep
• D)stage 4 NREM

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Definitions:

Fechner's Law

A principle describing the relationship between the intensity of a stimulus and the magnitude of the sensory experience, stating that the intensity must increase geometrically to produce a linear increase in perception.

Sensory Adaptation

The mechanism where sensory receptors reduce their responsiveness to stimuli that remain constant over time.

Weber's Law

A principle in psychology that states the smallest perceptible difference in a stimulus is proportional to the intensity of the original stimulus.

High Threshold

A term indicating a level of high sensitivity or resistance to stimulus before a response is triggered.