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Homeostasis and Behavior
Homeostasis and Behavior

... homeostasis – maintaining a stable balance in the body. Organisms’ bodies constantly respond to stimuli to maintain homeostasis. All organisms are able to detect changes in and around them and to respond to them. external stimulus – stimulus coming from outside an organism. internal stimulus – a sti ...
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Psychophysics ppt. - Ms. Engel @ South
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Psychophysics

Psychophysics quantitatively investigates the relationship between physical stimuli and the sensations and perceptions they affect. 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.
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