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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:

1. light perception.
2. the relationship between mood and sleep.
3. gerontology.
4. psychophysics.

I think it is a or d but I am pretty sure it is a.

  • Psychology -

    What is "usual environment"? From your data, I don't see any of the choices as valid. However, if the measures are used as criteria for mood, I would pick 2.

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