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Topic 5 Visuomotor Coordination.docx

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York University
Kinesiology & Health Science
KINE 3020
Merv Mosher

Visuomotor Coordination VISUAL SYSTEM - Vision gives us information about where our bodies are in space, about the relation of one body part to another, and about the motion of our bodies. - Visual Proprioception: gives us information about the environment but also about our own body. Peripheral Visual System PHOTORECEPTOR CELLS LIGHT CORNEA  LENS  RETINA - Two types of photoreceptor cells o Rods: vision at night, when amount of light is very low and too weak to activate the cones o Cones: Normal day light and responsible for color vision - Fovea: where light is at its clearest form - The blind spot where there are no photo receptors cells is where the optic nerve leaves the retina. - Sensory differentiation is key part of motor control, meaning the visual system has to identify and determine if they are moving - Object Identification and Motion sense are processed through two separate pathways. Central Visual Pathways - Left half of the visual field projects on the medial half of the retina of the left eye and the lateral half of the retina of the right eye. - Right visual field projects on the medial half of the retina of the right eye and the lateral half of the retina of the left eye. - Optic Disk: is the point where the optic nerves from left and right eyes leave the retina - Optic Chiasm: where the nerves from eye come together and the medial side of the eye cross while the lateral side do not cross. - Optic tract: is the point where the optic nerves become the tract after the chiasm. LATERAL GENICULATE NUCLEUS - Only 10-20% of inputs from retina come into the LGN, rest goes into the cortex and - Target of cells in the optic tract of the thalamus. - Six layers which map contralateral visual field, these projection cells of each layer send axons to the visual cortex o Magnocellular, most ventral, first two o Parvocellular, last four - Magnocellular layers, involved in the analysis of movement of visual image and coarse detail of an object, no response to color o more important in motor function such as balance - Parvocellular layers, function in color vision and more detailed structural analysis. o more important in the final phase of reaching for an object, where we need to grasp it accurately SUPERIOR COLLICULUS - Located posterior to the thalamus in the roof of the midbrain. - Function: o Maps the visual space around us in terms of visual, auditory, somatosensory cues. o Mapped in terms of relationship to the retina. - When a friend greets you as they bicyc
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