Term
| If there is a discrepancy between somatosensory, visual and vestibular info, which one overrides? |
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Definition
| Vestibular system decides whether the visual or somatosensory is correct. |
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Term
| If vestib info more best for slow or fast movements? |
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Definition
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Term
| The vestibular system is not enough to make decisions about the body in space, on its own. What other systems are necessary, and why? |
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Definition
| Visual - tells us when we're closer to or farther from something. Somatosensory provides info about the body via pressure on the limbs. |
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Term
| Which of the following is most sensitive to slow body movements; vestib, visual or somatosensory? |
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Definition
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Term
| Define limits of stability |
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Definition
| How far you can sway within the BOS without losing balance. |
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Term
| What is the primary determinant of limits of stability? vestib, visual or somato? |
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Definition
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Term
| Is vestib info necessary for ankle, or hip, strategies? Why? |
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Definition
| Hip. because when employing a hip strategy, the visual and somatosensory systems disagree. (ie:pushed backward; the push is from the front, so the body goes back, but the reaction is to lean forward. So body says moving back, but eyes see moving closer.) |
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Term
| What system is necessary to provide input for an ankle strategy? |
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Definition
| somatosensory in the ankles, because the visual and somatosensory systems match. |
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Term
| Some patients use hip movement to control their COG. This isn't normal; usually ankle strategies are used. Why does this occur? |
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Definition
| 1. Vestib systems maybe hypersensitive because of damage, and automatically trigger a hip response. 2. The hypersensitive vestib may also over-interpret head motion during body sawy, and react to small perturbation as though they were larger. 3. Vestib dysfunction may also influence the ability to interpret and control somato input from the feet. 4. And abnormal vestib info leads to an abnormal perception of the limits of stability, so small perturbations are overinterpreted as pushing, by the pts. |
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