A law that quantifies the subjective magnitude of a sensation in units of discrimination threshold R. Based on Weber's law, which states that the discrimination threshold ΔS of a stimulus is proportional to the objective magnitude S of the stimulus, GT Fechner derived the basic formula ΔR = K・ΔS / S , and by solving this, he determined that the psychophysical logarithmic law R = C・ log ( S / S 0 ) (where S 0 is the stimulus threshold, and K and C are constants) holds true. (→ Threshold) Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
感覚の主観的大きさを弁別閾 R を単位に数量化する法則。 G.T.フェヒナーは,刺激の弁別閾 ΔS が刺激の客観的大きさ S に比例するというウェーバーの法則を基礎として基本公式 ΔR=K・ΔS/S を導き,これを解いて R=C・ log (S/S0) (ただし S0 は刺激閾,KとCは定数) という精神物理学的対数法則が成立するとした。 (→閾 )
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