Lecture_4 - Lecture 4: Sensation and Perception i.e.: 12 A...

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Lecture 4: Sensation and Perception Sensation: process by which we bring in external energy sources into out CNS Perception: making sense of the external energy sources brought in through sensation i.e.: 12 A 13 C 14 **The middle characters can either be perceived as 13 or a capital B.** Sensation; physical sensing of environment physiological process relatively objective learning/experience not required i.e.: chalk on a board Perception; mental interpretation of environment psychological process relatively subjective dependant on learning/experience i.e.: words on a board Transduction: translation of external info into neurotal language. Vision; electrical: o stimulus energy; light waves o sensory receptors; photo-sensitive rods and cones in retina o sensory transduction; photoreceptors optic nerve thalamus visual cortex of occipital lobes Audition; electrical: o stimulus energy; sound waves o sensory receptors; pressure sensitive hair cells in cochlea of inner ear o sensory transduction; tympanic membrane ossicles cochlea basilar membrane auditory nerve thalamus auditory cortex of temporal lobes Olfaction (smell); chemical: o stimulus energy; shape of molecules in inhaled air o sensory receptors; mucous membrane of nose o sensory transduction; mucous membrane olfactory nerve limbic system Gustation (taste); chemical: o stimulus energy; shape of molecules dissolved in saliva o sensory receptors; tongue o sensory transduction; taste cells in taste buds facial nerve thalamus taste receptors throughout brain Tactile; chemical: o stimulus energy; touch, temperature, pain o sensory receptors; sensory neurons in skin
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o sensory transduction; skin receptors trigeminal nerve (above neck) or spinal nerves (everywhere else) thalamus somatosensory cortex of parietal lobes Kinaesthetic; internal environment: o stimulus energy; pressure strain o sensory receptors; joints, muscles, tendons o sensory transduction; sensory neurons spinal nerves cerebellum Vestibular; internal environment: o stimulus energy; motion o sensory receptors; inner ear
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This note was uploaded on 04/05/2010 for the course MATH 119 taught by Professor Harmsworth during the Spring '08 term at Waterloo.

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Lecture_4 - Lecture 4: Sensation and Perception i.e.: 12 A...

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