Fall_2006_sensation_perception

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 * 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 process of converting energy into neural activity * 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
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