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chap 4 notes

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University of Toronto St. George
Michael Inzlicht

PSY 100 - Chap 4 Sensation and Perception subliminal perception - the registration of sensory input without conscious awareness - perception without awareness can take place sensory adaptation - a gradual decline in sensitivity due to prolonged stimulation - another factor that influences registration of sensory input - an automatic, built-in process that keeps people tuned into the changes rather than the constants in their sensory input Light - a form of electromagnetic radiation that travels as a wave, moving, naturally enough, at the speed of light - amplitude: affects the perception of brightness - wavelength: affects the perception of color - purity: influences perception of the saturation, or richness, of colors Eye - retina: neural tissue lining the inside back surface of the eye; it absorbs light, processes images, sends visual info to the brain; the axons run from the retina to the brain converge at the optic disk. - optic disk: a hole in the retina where the optic nerve fibres exit the eye; part of an image cant be seen blind spot - cornea: a transparent window at the front that light enters into the eye. - lens: locate behind cornea , form an upside-down image of objects with cornea on the retina; focuses the light rays falling on the retina; made up of soft tissue, capable of adjustments that facilitate a accommodation process (curvature of the lens adjusts to alter visual focus). - nearsightedness: focus point falls in front of retina; eyeball is too long. - farsightedness: focus point falls behind retina; eyeball is too short - iris: the colored ring of muscle surrounding the pupil. - pupil: the opening in the centre of the iris that helps regulate the amont of light passing into the rear chamber of the eye; constricts = less light = sharpens image; dilates = more light = less sharp - saccades: eye movements - 10% of the light arriving at the cornea reaches receptors. - 2 type of receptors: rods & cones ; rods outnumber cones by huge margin, (100M -125M rods vs. 5M - 6.4M cones) - cones: specialized visual receptors that play a key role in daylight vision and colour vision; do not respond well to dim light; provide better visual acuity (sharpness and
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