Hi, I need help with essay on Final Exam Sensation and Perception. Paper must be at least 2750 words. Please, no plagiarized work!
The retina of our eye is composed of two types of cells: cones and rods. Cones are nerve cells sensitive to light, detail and color. Cones help us in reading letters and seeing objects especially at center. Cones are packed into the macula and help in visual details. On the other hand, rods are helpful for night vision and detection of moving objects.
Rods provide peripheral vision and are insensitive to color. Thus, when we go to a dark place from light, we are unable to see objects clearly. There rods help us to distinguish objects, however, being insensitive to color, we are able to see only the colorless object.
Figure 1: Log polar mapping from retina (left) to straite cortex (right). Points near the center of the visual field are represented more heavily in cortex than are points in the periphery. Source: Schwartz (1994)
Retina is the part of eye which is composed of the layer of nerve tissue and it covers the back two-thirds of the eyeball. Retina receives the light and converts it into chemical energy which activates the nerves (cones and rods). These nerves conduct the messages out of the eye into the higher region of the brain. The retina thins out in the center of the macula forming a pit called fovea. The reason of its thinness is that the light passing through fovea is scattered or observed by this thinness before it reaches the photoreceptors.
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