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Topic 5.docx

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Kinesiology & Health Science
KINE 3020
Merv Mosher

Topic 5: Sensory – Motor Systems 3: Visuomotor Coordination 1. Where do the optic nerves cross over to become optic tracts? Do all axons coming off the retina cross over? Explain.  The optic nerves from the left and right eyes leave the retina at the optic disk in the back. They travel to the optic chiasm where the nerves from each eye come together. Axons from the nasal side of the eyes cross, while those from the temporal side do not cross. At this point the optic nerve becomes the optic tract 2. What are the first two and the last four layers of the LGN (lateral geniculate nucleus – target cells in the optic tract) called?  The first two layers (most ventral) are the magnocellular (large cell) layers and layers four through six are called parvocellular (small cell) layers 3. Agnosia may be defined as _________ and is a condition effecting people with lesions in _____________.  Agnosia may be defined as the inability to recognize (show complete neglect of the contralateral side of the body, objects and drawings) and is a condition effecting people with lesions in the right angular gyrus (nondominant hemisphere) just behind area 7 4. When vision allows us to identify objects as well as note their movement in space, we are using _________ sense.  Vision allows us to identify objects in space and to determine their movements, this is considered an exteroceptive sense 5. Two people witnessed the same car accident, yet had two different perceptions of the event. What could explain the phenomenon?  One of the most important aspects of sensory processing is choosing the inputs that are most important for an individual to attend to in a given mom
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