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:

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

Answer 1

Carl is studying the effects of different lighting conditions on sleep and its impact on various physiological parameters like alertness, blood pressure, respiration rate, and muscle tension. By comparing the responses of three different groups (Group A with 150 watt light bulb, Group B in total darkness, and Group C in their usual environment), Carl aims to understand how light intensity during sleep affects the body.

Therefore, the most appropriate answer is 1. light perception, as Carl's research focuses on investigating the influence of light on sleep and its related physiological responses.