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As a scientist, Carl is concerned with the intensity of lights in the modern human environ
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As a scientist, Carl is concerned with the intensity of lights in the modern human environment.  In his research project,
Group A consists of volunteers who have agreed to sleep each night for a week with a 150 watt light bulb hanging over their
bed. Group B will sleep in total darkness, and Group C will sleep in their usual environment. Alertness, blood pressure,
respiration rate, and muscle tension will be sampled in the morning and evening. Carl is studying: a. light
perception. b. the relationship between mood and sleep. c. gerontology. d. psychophysics.
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