PSYC 1020H Chapter 4: Sensation and Perception
10 Mar 2017
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Document Summary
Visual system: light: travels as a wave, varies in amplitude (height) and wavelength (distance between peaks). Amplitude affects the perception of brightness; wavelength affects perception of colour. Purity (how varied the mix of light is), and influences perception of saturation or richness of colours: eye: channels light to neural tissue that receives it (retina). Cornea and crystalline lens behind it form an upside-down image of objects on the retina: lens: transparent eye structure that focuses light rays on retina. Capable of accommodation (curvature changes to alter visual focus; lens gets fatter/rounder when looking at close objects, lens flattens when looking at distant objects): nearsightedness: close objects are clear but distant objects are blurry. Focus of light from distant objects falls short of the retina, when cornea or lens bends the light too much or eyeball is too long: farsightedness: distant objects are clear but close objects are blurry.
