Biopsychology - 4/30
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This 2 page Reader was uploaded by Sierra Wollen on Monday May 5, 2014. The Reader belongs to a course at University of Washington taught by a professor in Fall. Since its upload, it has received 96 views.
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Date Created: 05/05/14
Psych 202 430 Vision Outline Anatomy of eye Photoreceptors transduction Pathway of visual signal Anatomy The eye o Lens Ciliary muscle Retina Fovea Optic nerve I Retina Optic nerve bers o Made up of ganglion cell axons Ganglion cell layer o First neurons in system re APs Bipolar cell layer Rod and cone cell layer phororeceptors o Send signals to bipolar cells I Fovea Back surface of eye No cell layer Light can get to photoreceptors directlv Photoreceptors photoreceptors Rods o No color o Low detail acuity o Densely packed away from fovea periphery Cones o Color o Detail high acuity o Most cones near fovea Transduction Translate photons into neural signals Happens at rods and cones Signal less strongly in light Light sensitive proteins break down on rods and cones In dark o Na and Ca channels open cell depolarized o Glutamate released In light o Na and Ca channels closed cell hyperpolarized o Less or no glutamate released Adaptation Visual signal MWNr quot 39gt quot Bright9 dim photopigments on rods need time to regenerate pupils dilate Dim9bright all photopigments broken down cones recover quickly pupils constrict Photoreceptors send info about light to GRADED Bipolar cells that send info about light to the GRADED Ganglion cells Whose axons make up the APs Optic nerve which crosses at the Optic chiasm crossing point btwn optic nerves No photoreceptors at spot optic nerve leaves eye blind spot Optic tract Visual info from one side transferred to be processed in other side of brain After optic chiasm nerves renamed Optic tract which projects to the LGN in the thalamus which projects to the Striate cortex aka visual cortex which projects to Extrastriate cortex
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