Textbook Notes (368,415)
Canada (161,876)
Psychology (1,468)
PSYCH 1XX3 (384)
Joe Kim (357)
Chapter 4 (Sections Intro-2, 4-6)

PSYCH 1XX3 Chapter 4 (Sections Intro-2, 4-6) : VISION

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Joe Kim

VISION: Nearly 13 of brain devoted to processing visual info The stimulus Light: Light travels as a wave, and can vary in 2 aspects: amplitude (brightness, height of each wave, greater amplitude = more light being emittedreflected, brighter) and wavelength (hue, distance bw the peaks of successive waves measured in nanometersmillionths of a mm, small wavelengths = high frequency, large wavelengths = low frequency, different colours), purity (saturation, light made of single wavelength = purecompletely saturated, natural light we usually see is made of many wavelengths = desaturated) o Visible spectrum is species dependent (humans see from 360violet 750red, bees see shorter than 360nm in ultraviolet, snakes see longer than 750nm in infrared) The Eye: Cornea: curved, transparent window at front of eye responsible for 80 of focusing, rest of eye covered by tougher white membrane called sclera Pupil: black dot in middle of your eye, whose size is controlled by the iris (band of muscles controlled by brain) Lens: transparent structure that does final focusing of light onto retina at back of the eye, flexible piece of tissue that changes shape (called accommodation) from surrounding muscles (close object = rounder lens, far object = elongated lens) o Hyperopia (farsightedness): can see far bc lens does not have enough curvature to bend light, image focused behind retina o Myopia (nearsightedness): can see near, light focused in front of retina o Failure to focus light bc length of eyeball (nearsighted have lightly longer, farsighted have slightly shorter), curvature of cornea, power of lens may be increaseddecreased relative to normal The brain corrects for upsidedown and reserved retinal images Vitreous humor: clear, jellylike substance that comprises main chamber inside eye Retina: neural tissue that lines back of the eye The Retina: Begins the translation of physical stimulus of light into neural impulses Paper thin sheet that covers back of eye made of neural cells arranged in 3 different layers w insidetoout arrangement o Photoreceptors: layer farthest away (other 2 layers are transparent) bc in order for photoreceptors to live, they must get nutrients from layers of cells called the retinal pigment epithelium (RPE) at very back of eye, outer segments contain stack of discs
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