Greene Practice Questions -- Exam 2(2)

Greene Practice Questions -- Exam 2(2) - 2nd Midterm...

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2 nd Midterm Practice Questions -- Greene 1. The ability for the eye to form an image of the external world depends on the presence of the retina. Without the retina, no image can be formed. F-lens 2. A pinhole camera will provide a sharp image of objects, no matter at what distance from the camera the objects lie. Pinhole determines focal length, everything is focused at infinity for that focal length; T 3. The vertebrate eye adjusts for the distance of objects by moving the lens forward or backward until the image is sharp upon the retina. F-change size of lens, not moving it 4. Greene said that the basic reason that our rods and cones respond to the wavelengths that we call light, is because water and air are relatively transparent to those wavelengths. T 5. Which is a “light primary” for the trichromatic (component) theory of color vision? a. magenta b. white c. yellow d. green e. cyan GREEN 6. One can see a wavelength that lies between red and blue as magenta because this wavelength stimulates both the red and blue cones. T 7. Mixtures of light primaries yield the perception of intermediate colors that appear less saturated, i.e., the hue is less intense. F-has most white 8. What name do psychologists use to describe the family of photopigments in cones? a. rhodopsin –visual purple in rods b. iodopsin c. chromatopsia d. multi-opsins e. none above iodopsin 9. The major evidence that Hering used to support his Opponent Theory of color vision was to show that one could mix red light with green light to produce the perception of yellow. afterimages 10. What kind of color deficit would produce blue/yellow confusion? tritanopsia a. protanopsia b. deuteranopsia c. tritanopsia d. achromatopsia e. none above 11, Greene speculated that color opponency is designed to help distinguish objects from their background. Color vision developed in ocean waters, where opposition of blue and nonblue (yellow) provided a boost to this process. Similar arguments can be made for development of red/green opposition. T 12. At what location in the retina does a stimulus first produce action potentials? E- ganglion is all or nothing a. rods b. cones c. bipolar cells d. amacrine cells e. ganglion cells
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13. The fovea has better acuity primarily because it is filled with cones, and cones are smaller than rods. F-not based on size, but ratio of receptive cells and ganglion is 1:1 with cones 14. The receptive field of a given ganglion cell away from the center of vision generally has a “concentric”, i.e., center/surround, design. T-cones have 1:1 design, but rods have center/surround design so can have this connection; fovea are toward the center so it’s away from center of vision 15. If the center of the receptive field of a ganglion cell responds to light by activation of firing, then additional light falling in a ring that surrounds the center tends to cancel this activation. T-inhib/excit cancel each other out 16. The concept behind the use of receptive fields for edge detection is based on having
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This note was uploaded on 10/19/2010 for the course BISC 230 taught by Professor Staff during the Spring '07 term at USC.

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Greene Practice Questions -- Exam 2(2) - 2nd Midterm...

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