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The Collaborative International Dictionary
Psychophysics

Psychophysics \Psy`cho*phys"ics\, n. [Psycho- + physics.] The science of the connection between nerve action and consciousness; the science which treats of the relations of the psychical and physical in their conjoint operation in man; the doctrine of the relation of function or dependence between body and soul.

Wiktionary
psychophysics

n. (context psychology English) The branch of psychology concerned with the effects of physical stimulus on mental processes

WordNet
psychophysics

n. the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects

Wikipedia
Psychophysics

Psychophysics quantitatively investigates the relationship between physical stimuli and the sensations and perceptions they produce. Psychophysics has been described as "the scientific study of the relation between stimulus and sensation" or, more completely, as "the analysis of perceptual processes by studying the effect on a subject's experience or behaviour of systematically varying the properties of a stimulus along one or more physical dimensions".

Psychophysics also refers to a general class of methods that can be applied to study a perceptual system. Modern applications rely heavily on threshold measurement, ideal observer analysis, and signal detection theory.

Psychophysics has widespread and important practical applications. For example, in the study of digital signal processing, psychophysics has informed the development of models and methods of lossy compression. These models explain why humans perceive very little loss of signal quality when audio and video signals are formatted using lossy compression.

Usage examples of "psychophysics".

In fact, we need to develop a science of psychophysics, the energetics and physics of mind function.

Professor Wolfgang Erhofen, of the Yale Psychophysics Department, reported that in questioning several hundred persons kidnapped by the invader, it was discovered that two of the victims, who had been in auto accidents, were wearing the usual steel neckbrace collars to immobilize broken necks or spines.

Research Fellowship in psychophysics, a strange couple of years editing train timetables, and managing a second-hand bookshop.

He was an Associate Professor of Psychophysics at the University of Ed­.