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:

Question

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.

Angela · Answer

B. the relationship between mood and sleep

Ms. Sue · Answer

I agree.

PsyDAG · Answer

Since none of the measures seem to be related specifically to mood, I would choose psychophysics.