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4.2 Seeing
LEARNING OBJECTIVES
- Identify the key structures of the eye and the role they play in vision.
- Summarize how the eye and the visual cortex work together to sense and perceive the visual stimuli in the
environment, including processing colors, shape, depth, and motion.
Whereas other animals rely primarily on hearing, smell, or touch to understand the world around
them, human beings rely in large part on vision. A large part of our cerebral cortex is devoted to
seeing, and we have substantial visual skills. Seeing begins when light falls on the eyes, initiating
the process of transduction. Once this visual information reaches the visual cortex, it is processed
by a variety of neurons that detect colors, shapes, and motion, and that create meaningful
perceptions out of the incoming stimuli.
The air around us is filled with a sea of electromagnetic energy; pulses of energy waves that can
carry information from place to place. As you can see in Figure 4.6 "The Electromagnetic
Spectrum", electromagnetic waves vary in their wavelength—the distance between one wave
peak and the next wave peak, with the shortest gamma waves being only a fraction of a