Travel agents hawaii on Weber’s law a mathematical model of the difference threshold, stating that the magnitude needed to detect physical change in a stimulus is proportional to the absolute magnitude of that stimulus. Thus the more intense the stimulus, the greater the change that must be made in it to be noticed. This can be expressed as AI/I = k, where AI is the difference threshold, I is the original stimulus magnitude, and k is a constant called Weber’s fraction. See also fechner’s law. [proposed in 1834 by Ernst Weber (1795-1878), German physiologist and psychophysicist Wechsler Adult Intelligence Scale (WAIS) an intelligence test originally published in 1955. A modification and replacement of the Wechsler-Bellevue Intelligence Scale, the WAIS currently includes seven verbal subtests (Information, Comprehension, Arithmetic, Similarities, Digit Span, Vocabulary, Letter-Number Sequencing) and seven performance subtests (Digit Symbol, Picture Completion, Block Design, Picture Arrangement, Object Assembly, Matrix Reasoning, Symbol Search). The most recent version is the WAIS-III, published in 1997. Travel agents hawaii 2016.