
3.1 Brightness and Contrast
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system. To regard it as such is to commit the "homunculus fallacy"; when an
image has been transmitted by the eye to the brain, there is no "little man"
inside the brain to look at it! The input to the VS may be an image, but the
output which it furnishes to the higher brain centers must be something
quite different. This fact has many implications as regards the perception of
even the simplest stimuli, as we shall see in the course of this chapter.
3.1 BRIGHTNESS AND CONTRAST
In this and the next section we discuss the visual perception of simple
stimuli such as spots, edges, and bars of light. Perception of