In theory, Wundt believed that the complexity of the human mental experience could be broken down into three main types: sensations, images, and feelings.
Sensations As Wundt explained them, sensations were the basic forms of experience. They consisted of a direct relationship between an excitation, or stimulus, of the cerebral cortex (a center of intellectual functioning in the brain) and a sensory experience. These sensations could be placed into categories including modality, vision, or audition, in addition to describing such features as intensity and duration.
Images Images were basically the same concept as sensations, though these were associated with a local stimulus in the cortex rather than an external stimulus outside the body.
Feelings The category of feelings represented whatever did not come from the sense organs or a "revival of sensory experience." The "tridimensional theory of feeling" was Wundt's premise that all feelings could be categorized by three different sets of opposing emotions—pleasant or unpleasant, tense or relaxed, and excited or depressed. Any combination of one of each of the sets could describe any feeling.
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