According to Weber-Fechner's law, strength of stimulus perceived is directly propoional to:

Ans: A. Intensity of stimulus(Ref: Guyton 13/e p615)According to Weber-Fechner's Law, strength of stimulus perceived is directly propoional to intensity of stimulus."Weber-Fechner Principle--Detection of "Ratio" of Stimulus Strength: In the mid 1800s, Weber first and Fechner later proposed the principle that gradations of stimulus strength are discriminated approximately in propoion to the logarithm of stimulus strength.