Randy

　　Nelson

　　heads

　　the

　　Department

　　of Neuroscience at Ohio State University. He says animals that slept in the blue light and white light appeared to be the most depressed. “What we saw is that these animals didn't show any sleep uneasiness at all but they did mess up biological clock genes and they did show depressive sign, while if they were in the dim red light, they did not. ”

　　Randy Nelson notes that photosensitive (感光的) cells in the eyes have little to do with eyesight. He says these cells send signals to the area of the brain that controls what has been called the natural sleep­wake cycle.

　　He says there's a lot of blue in the white light. This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing the red light or darkness.

　　1. Researchers use hamsters in the experiment because ________.　

　　A. they are similar to humans in dealing with colors

　　B. they are easy to observe and study

　　C. they are sensitive to colors like human beings

　　D. they are active at night and sleep during the day

　　2. What sign shows that the hamsters are depressed?

　　A. They drink less sugary water.

　　B. They don't sleep well.

　　C. Their eyesight becomes worse.

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