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PSYCH 1100
Thomas Kondzielewski

Psych  A) a "typical" brain cell responds to only a small area of the total field of vision. In this example, the cell responds to stimuli that fall above and left of the center of vision B) the bar graph illustrates how a brain cell may act as a feature detector. Notice how the cell primarily responds to one type of stimulus. Blindsight (variant of visual agnosia): preserved superior colliculus. C OLOR VISION Trichromatic Theory  • color vision theory that states we have three cone types: blue, green, red • other colors produced by a combination of these o wavelength sensitivity would suggest more like a blue, green, yellow o or blue, blue-green, yellow-green Opponent Process Theory • color vision theory based on three "systems": o Red or green o blue or yellow o black or white o not purple or orange • exciting one color in a pair (ex/ red) blocks the excitation in the other member of the pair (green) • after image: visual sensation that remains after stimulus is removed (seeing a flashbulb after the picture has been taken) SIMULTANEOUS COLOR CONTRAST • changes in perceived hue that occur when a colored stimulus is displayed on backgrounds of various colors C OLOR B LINDNESS • Color blindness: inability to perceive colors; lacks cones or has malfunctioning cones o total color blindness is rare • Color weakness: inability to distinguish some colors o red-green is most common; much more common among men than women  Recessive, sex-linked trait on X chromosome S ONAR SIGHT • spatial sense from echolocation D ARK A DAPTATION • increased retinal sensitivity to light after entering the dark; similar to going from daylight into a dark movie theater • Rhodopsin: light-sensitive pigment in the rods; involve with night vision o help from vitamin A in carrots • Night blindness: blindness under low-light conditions; hazardous for driving at night • myth busters says: pirates like to be prepared for "tasks" below deck H EARING • sound waves: rhythmic movement of air molecules • pitch: higher or lower tone of a soun
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