THE ORIGINS OF KNOWLEDGE. Sensation
The study of sensory processes grew out of questions about the origin of human knowledge.
The empiricists argued that all knowledge comes through stimuli that excite the senses.
However, the only way to get information about distal stimuli (the objects or events in the world)
is through the proximal stimuli (the energies that impinge on a sensory surface). The empiricists
therefore argued that much of perception is built up through learning by association.
PSYCHOPHYSICS
Research in psychophysics seeks to relate the characteristics of the physical stimulus to both
the quality and intensity of the sensory experience. One psychophysical measurement is the
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