Fall_2006_sensation_perception - Introduction to Sensation...

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Introduction to Sensation and Perception Overview of Today: Discuss Basic Processes of Sensation and Perception Review Visual Processes in Detail, with figures and videoclips Examine How Perception is “Constructed” and what features influence the construction process Basic Processes of Sensation 1) Modification via accessory structures energy input and operating on it to make sense of it. 2) Transduction 3) Encoding 4) Representation in Cortex Modification of Stimuli via Accessory Structures e.g., lens of eye is accessory structure that changes light by focusing it outer part of ear is accessory structure that collects sound Detectable Energy is Transduced Transduction is a chemical process of converting energy into neural activity or code Transduction Occurs at Sensory Receptors , which are cells that specialize in detecting certain forms of energy (light waves, sound waves, heat, etc.) Sensory Receptors respond especially to CHANGES in stimulus intensity Adaptation (decreased responsiveness in firing of cells and concomitant conscious experiencing) occurs to an unchanging stimulus over time Transduction results in encoding of energy that is detected/sensed:
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Coding is the translation of physical stimulus properties into patterns of neural activity that specifically identify those physical properties Final output is action potentials firing down sensory neurons The rates of firing of coalitions of action potentials “represent” "re- presentation" of sensation at the level of brain activity the external stimulus in the final stage of sensation. Encoded Information is “Represented” in Cortex Thalamus is Relay Station for Sensory Information (except smell) Cortical Representations are Topographically Contralateral to part of world sensed opposite side of brain uses opposite side of body for stimuli and use
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This note was uploaded on 04/25/2008 for the course PSY 202 taught by Professor Henriques during the Fall '08 term at University of Wisconsin.

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Fall_2006_sensation_perception - Introduction to Sensation...

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