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Answer for the clue "The branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects ", 13 letters:
psychophysics

Word definitions for psychophysics in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...

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

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

Wikipedia Word definitions in Wikipedia
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, ...

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.