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lecture 10 hearing - Lecture 10 Hearing Overview 1 Review 2...

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10/15/2008 1 Lecture 10: Hearing Overview 1. Review 2. Brain regions involved visual system 3. Damage to visual system 4. Auditory system 5. Properties of sounds 6. Anatomy of the ear 7. Sound transduction 8. Pathways to brain Review Sensory transduction – conversion of sensory stimuli into a neural impulse Visual systems converts light into a neural signal Know anatomy of the eye and purpose of main structures Iris controls amount of light that enters thru the pupil Retina contains photoreceptors that convert light to neural impulse Lens – focuses light on back of retina Periphery of retina – low acuity vision Fovea of retina – high acuity vision Optic disk – blindspot Optic nerve axons that leave eye Rods process low light and colorless vision Cones process color by absorbing different waves of light and details of vision
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10/15/2008 2 Review Saccadic eye movements resolve blindspot. Color deficiencies Lack of cones result in color blindness or tritanopia Wrong opsin (protein that absorbs light in cones) leads to color deficiency
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