…The absolute threshold is 10 −8 μW for light and 10 −10 μW/cm2 for sound intensity (which only moves the eardrum by less than 10 −9 cm). The Weber-Fechner formula and Stevens' power function proposed by Stevens SS Stevens are known as formulas that show the relationship between the magnitude of sensation and the strength of a stimulus. If the magnitude of sensation is R , the strength of the stimulus is I , and the stimulus threshold is I 0 , then R = K log I + C (Weber-Fechner formula) R = K ( I - I 0 ) n (Stevens' power function) In both cases, K and C are constants. … *Some of the terminology explanations that refer to the "Weber-Fechner equation" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…絶対閾は,光覚で10-8μW,音の強さ10-10μW/cm2(このとき鼓膜を10-9cm足らず動かすにすぎない)などである。感覚の大きさと,刺激の強さの関係を示す式として,ウェーバー=フェヒナーの式とスティーブンスS.S.Stevensが提唱したスティーブンスのべき関数が知られている。感覚の大きさをR,刺激の強さをI,刺激閾をI0とすると, R=KlogI+C (ウェーバー=フェヒナーの式) R=K(I-I0)n (スティーブンスのべき関数) ともにKとCは定数である。… ※「ウェーバー=フェヒナーの式」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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