Weber fraction

the ratio of the just noticeable difference (see difference threshold) to the intensity of a stimulus. Increases in the intensity of a stimulus that are just noticeably different to the observer are a constant fraction of the stimulus intensity. The size of the Weber fraction varies as a function of stimulus condition and sense modalities. See Weber’s law. [Ernst Heinrich Weber]

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Psychology term of the day

February 2nd 2025

statistical prediction

the process of using correlations between variables to hypothesize about future events and outcomes. For example, a university administrator may use a regression equation to predict a student’s college grade point average with reasonable accuracy from measures of performance in high school, such as scores on tests and final grades in classes.