CGS Lecture 13

The rods and cones of the eye turn photons into chemical reactions. The difference is that rods are sensitive → a little light can activate them, while rods are the opposite. There is only one type of rod → does not tell you the specific color, can only say how much nm present → is sensitive to green. There are two different types of cellular streams. The magnocellular stream is responsible for moving across the retina → strong contrast between light and dark, and is responsible for spatial orientation (goes to the parietal lobe).  The parvocellular (small cellular) system likes color, and goes to the temporal lobe (for object orientation).

 Surface perception is a 3D representation of scenes. Our visual system is able to parse into objects. Moreover, it is able to recognize and identify objects.  Lastly, scene perception is the joining of multiple objects to generate a layout.  Some factors that affect perception are how much you know about the subject matter, organize this perceptually, and attention.

 Gestalt psychology is an integral part that theorizes about how humans perceive. The Cue Approach is that the cues are still available in a 2D image. First illusion we get is Occlusion, (hides something behind the other thing).  The Linear Perspective is essentially when the brain discerns between the different angles found in architectural structures such as buildings. The Size and Distance approach propagates that (railroad tracks, for example, have the same length). However, we see the tracks as being larger because of how much farther they are from us.