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Psychophysical: sharing the physical and psychological qualities. In the 19th century, German physicist, philosopher and mystic Gustav Theodor Fechner was revolutionary in terming psychophysics. In its simplest form, it is a mathematical relationship between one's internal (psychic) and external (physical) worlds on the basis of experimental data. Multiple studies are currently being conducted in relation to Fechner's ideas. 
Psychophysical may refer to:
- Psychophysics, the subdiscipline of psychology dealing with the relationship between physical stimuli and their subjective correlates, or percepts
- Psychophysiology, the branch of psychology that is concerned with the physiological bases of psychological processes including sensory processes, and is thereby connected to psychophysics
- Psychophysical parallelism, in philosophy, is the theory that the conscious and nervous processes vary concomitantly whether or not there be any causal connection between them.
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