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How would someone’s sensitivity to touch by their fingertips affect their ability to read Braille?
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- If you were deaf, what impact might instant messaging over the Internet have on you?How does the eye focus the light rays of an image? What do nearsighted and farsighted mean?When a person blinks, the part of the brain that interprets visual stimulation is suppressed. The spontaneous act of blinking is controlled by the area of the brain that controls involuntary movements such as breathing and blood pressure. To determine whether the lack of light or the act of blinking causes the suppression, scientists had subjects close their eyes and then placed a bright flashing light in their mouth to stimulate the photoreceptors in the eyes through the palate. Visual stimulation was still suppressed. So the photoreceptors in the retina were not stimulated even though they were exposed to light. This study demonstrated that when a person blinks, it is the act of blinking and not the absence of light that causes the suppression of visual stimulation. In the diagram above, identify the part of the brain that is suppressed during blinking and the part of the brain that controls involuntary, spontaneous blinking. Select one: a. 3 and 8 b. 2 and 9 c. 5 and 6 d. 1…
- Which Receptor detects smell?How do we sense touch?Eskimos wear a great deal of clothing and have limited exposure to uv light, but do not suffer from Vitamin D deficiency. Why? A person who has been playing in the snow notices that their fingertips are very pale. why? Where would you expect to find a high concentration of Merkel discs and other tactile corpuscles? Why? An old wives' tale says that if you keep hair trimmed at the ends, it will grow faster. Please discuss why this is not true. Explain why you can scrap your skin but not bleed.
- After getting her finger caught in a drawer, Ruth holds her finger tightly, and this seems to reduce the pain somewhat. Most likely, this works because what?Watch this video (http://openstaxcollege.org/l/2point) to see a quick demonstration of two-point discrimination. Touching a specialized caliper to the surface of the skin will measure the distance between two points that are perceived as distinct stimuli versus a single stimulus. The patient keeps their eyes closed while the examiner switches between using both points of the caliper or just one. The patient then must indicate whether one or two stimuli are in contact with the skin. Why is the distance between the caliper points closer on the fingertips as opposed to the palm of the hand? And what do you think the distance would be on the arm, or the shoulder?What are the similarities in how receptive fields are represented by the nervous system? What advantage does this give us with respect to senses?
