General Sensation

General Sensation - 10/19/2011 GENERAL SENSATION Learning...

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10/19/2011 1 G ENERAL S ENSATION Learning Outcomes: Be able to Define sensory transduction List types of sensory receptors Define sensory unit Describe the receptor potential Explain how stimulus attributes (intensity, location etc ) are coded 1 location, etc.) are coded Describe the ascending pathways carrying sensory information Compare and contrast processing of a painful vs. a pressure stimulus S ENSORY S YSTEM Definition Nervous system division that consists of sensory receptor cells , the neural pathway that conducts information, and those parts of the brain process the information Organized to receive, process and relay stimulus information Hierarchically organized 2 Sensation and Perception
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10/19/2011 2 S ENSORY R ECEPTORS TRANSDUCE information from environmen Convert stimulus energy into changes in environment Definition of sensory transduction: Adequate stimulus: Requires least amount of energy to into changes in membrane potential 3 amount of energy to activate receptor SENSORY RECEPTORS can be categorized by WHAT they transduce Types of sensory receptors Thermoreceptors Mechanoreceptors Nociceptors Photoreceptors Chemoreceptors 4
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10/19/2011 3 RECEPTORS can also be classified by “WHERE” stimuli originate Exteroceptors Interoceptors 5 Proprioceptors SOMATOSENSATION Touch and Pressure Sense of Posture and Movement Temperature Pain 6
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10/19/2011 4 B ASIC C HARACTERISTICS OF 7 S ENSORY C ODING S ENSORY U NIT ECEPTIVE F IELD Receptive Field
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This note was uploaded on 03/19/2012 for the course BIO 2000 taught by Professor Ewr during the Spring '12 term at Alabama.

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General Sensation - 10/19/2011 GENERAL SENSATION Learning...

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