COGS17-The Other Senses

COGS17-The Other Senses - 1 COGS 17 Fall 2009 The Other...

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Unformatted text preview: 1 COGS 17 Fall 2009 The Other Senses Mary ET Boyle, Ph.D. Department of Cognitive Science Department of Cognitive Science UCSD Peripheral Vestibular Structure: Inner ear • Inner ear miniaturized accelerometers inertial guidance devices Continually reporting information about: motions and position of head and body Information goes to: brainstem cerebellum somatic sensory cortices 2 Central Vestibular Structure: Vestibular Nucle • Vestibular Nuclei Directly controls motor neurons controlling: extraocular cervical postural Important for: stabilization of gaze head orientation posture during movements The Vestibular Labyrinth: Main peripheral componen • Main peripheral component Connected with cochlea Uses same specialized hair cells Transduce physical motion into neural impulses head movements inertial effects due to gravity ground-borne vibrations Vestibular endolymph (like cochlear endolymph) high in K + and low in Na + 3 Vestibular navigation Translational • Translational movements are in terms of x, y, z Saccule Utricle roll, pitch, yaw Rotational movements • Roll – tumbling left or right -- move your head from your left to your right shoulder • Pitch – nod your Semicircular canals head “yes” • Yaw – shake your head “no” 4 The Vestibular Labyrinth – otolith organs Two otolith organs (vestibular sacs • Two otolith organs - (vestibular sacs) Utricle – hair cells are located on the floor- horizontal plane Saccule – hair cells are located on the wall – vertical motion • Respond to: Information about the position of the head relative to the body utricle saccule utricle cochlea Vestibulocochlear nerve VIII The Vestibular Labyrinth – semicircular canals Three semicircular canal (vestibular sacs • Three semicircular canals- (vestibular sacs) Oriented in three planes Ampullae – located at the base of each of the semicircular canals....
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This note was uploaded on 09/07/2011 for the course COGS 17 taught by Professor Pineda during the Spring '06 term at UCSD.

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COGS17-The Other Senses - 1 COGS 17 Fall 2009 The Other...

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