Joan is vision impaired and attends a disability support group with others who a

Question

Joan is vision impaired and attends a disability support group with others who are also blind. At one meeting, they discuss their sleep schedules. Some people in the group state that they don't have a problem being wakeful during the day and sleepy at night, but others find that their sleep/wake schedule is constantly "screwy." Which type of blind person tends to be wakeful in synchrony with sunlight, and why? Select one: a. People blind as a result of cortical damage continue to synchronize to sunlight, because visual input still reaches the brain area that controls wakefulness. b. People blind as a result of cortical damage continue to synchronize to sunlight, because they respond to the gravitational pull of the sun. c. People blind as a result of eye damage continue to synchronize to sunlight, because they respond to light striking the skin. d. People blind as a result of eye damage continue to synchronize to sunlight, because they respond to the gravitational pull of the sun. Question 5 Correct Mark 1.00 out of 1.00 Flag question Question text

Explanation / Answer

People blind as a result of cortical damage continue to synchronize to sunlight, because visual input still reaches the brain area that controls wakefulness. It is understood that wakefulness is controlled by light entering the hypothalamus (in the brain) which further regulates the circadian rythm in the body. In visually impaired, even though light does not enter the eye per se, visual input still reaches brain areas that control wakefulness. Oral melatonin is also seen to be helpful in maintaining rythm is visually impaired.

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