PHGY 209 CNS Lecture III Textbook notes

PHGY 209 CNS Lecture III Textbook notes - PHGY 209 CNS...

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PHGY 209 CNS Lecture III Textbook notes November 1, 2008 SENSORY SYSTEM Sensation - sensory information that reach consciousness Perception - person’s understanding of sensation’s meaning. Sensation and perceptions only occur after CNS modifies or process the sensory information. Sensory processing- transfer of stimulus energy into graded potentials/receptor potentials action potentials pattern of action potentials provide information about the world. SENSORY RECEPTORS They are either specialized endings of afferent neurons or separate cells that signal the afferent neurons by releasing chemical messangers. They change sensory information into graded potentials that can initiate action potentials. Stimulus- energy or chemical that activates a sensory receptor Sensory transduction -process by which stimulus is transformed into an electrical response. Adequate stimulus- type of stimulus which a particular receptor responds most strongly to. All sensory receptors can be activated by different types of stimulus if the intensity is sufficiently high. (I.e. poking eye give the sensation of light even though it is a different type of stimulus). Regardless of how the receptor is stimulated, any given stimulus only give rise to one sensation. Mechanoreceptors-respond to pressure or stretch
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This note was uploaded on 12/25/2008 for the course PHGY PHGY 209 taught by Professor Annwechsler during the Spring '08 term at McGill.

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PHGY 209 CNS Lecture III Textbook notes - PHGY 209 CNS...

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