PSYC 2650 Chapter Notes - Chapter 3: Lateral Geniculate Nucleus, Ganglion Cell, Lateral Inhibition
18 Dec 2016
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The visual system: humans vision is the dominant sense; this is reflected in how much brain area is devoted to vision compared to any of the other senses also reflected in many aspects of our behaviour. Light is produced by many of our surroundings the sun, lamps, candles and this light then reflects off most other objects. Cons, in contrast are less sensitive than rods and so need more incoming light to operate at all. There are three different types of cones, each having its own pattern of sensitivities to different wavelengths. Strong firing from only the cones that prefer short wavelengths, for example, accompanied by weak (or no) firing from the other cone types, signals purple. Blue is signaled by equally strong firing from the cones that prefer short wavelengths and those that prefer medium wavelengths, with only modest firing by cones that prefer long wavelengths. Cones enables you to discern fine detail.
