Lecture 6

Lecture 6 - Vision : stimulus Input A. electromagnetic...

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Vision : stimulus Input A. electromagnetic energy: travels in waves 1. Visible light(about 350-750 nanometers) wavelength – distance between peaks -hue amplitude-height of waves- brightness of color purity- number of wavelengths that make up the color- saturation/vividness of color psychology of seeing: anatomy of the eye cornea: transparent covering at the front of the eye:provides protection and support pupil: small opening through which light flows into the eye. Changes in size depending on the amount of light that is let into the eye iris: colored area surrounding pupil; muscle that dilates and contracts the pupil lens: focuses incoming light be changing its curvature retna: light sensitive surface on back of the eyeball onto which the image is focused. In the center of it is the fovea(where visual acuity is the clearest) the retna contains two sets of receptor cells: rods: distigish black, white and shades of gray; night vision 120 million located around the periphery of the retna, not the forea. Cons: color and do well in bright light 6-8 million concentrated mainly in the forea
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This note was uploaded on 01/30/2012 for the course PGS 101 taught by Professor Blan during the Fall '08 term at ASU.

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Lecture 6 - Vision : stimulus Input A. electromagnetic...

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