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Chapter 9

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Carleton University
PSYC 2800
Amanda Helleman

Chapter 9 Primary visual cortex V1Striate cortex that receives input from the lateral geniculate nucleus Perception subjective interpretation of sensations by the brain Optic flow streaming of visual stimuli that accompanies an observers forward movement through space Opponent processing theory explanation of color vision that emphasizes the importance of the opposition of pairs of colors red vs green and blue vs yellow Ocular dominance column functional column in the visual cortex maximally responsive to information coming from one eye Extra striate secondary visual cortex visual cortical areas outside the striate cortex Auditory flow Change in sound heard as a person moves past a sound source or as a sound source moves past a person Dichromatic theory explanation of color vision based on the coding of three primary colors red green and blue Sensation registration of physical stimuli from the environment by the sensory organs Retinal ganglion cell RGC one of a group of retinal neurons with axons that give rise to the optic nerve Retina light sensitive surface at the back of the eye consisting of neurons and photoreceptor cellsOur version of reality is a perception of the sensory worldLight wave lengths vary from about 400 nanometersviolet to 700 nanometers red Our visible light is constrained by the properties of our visual receptors We cannot see light in the ultraviolet or infrared rangeStructure of the eye sclera white part that forms the eyeballs cornea eyes clear outer covering iris opens and closes to allow more or less light in len which focuses light retina where light energy initiates neural activityas light enters eye first it is bent by the cornea travels through the hole in the iris called the pupil and is then bent again by the lens curvature in cornea is fixed so bending of light waves are fixed in the lens light waves are adjusted by the bending of the lens by greater or lesser degreesimage of objects are projected onto the retina upside down and backward the brain can make adjustments regardless of the orientation of the images it receivesthe blind spot this region has no photoreceptors and is therefore blind also known as optic disc region of the retina where axons forming the optic nerve leave the eye and where blood vessels enter and leave your visual system solves the blindspot problem by locating the optic disc in a different location in each of your eyes optic disc is lateral to the fovea in each of your eyes
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