<prompt> Which of the following represents Weber Fechner Law?Magnitude of stimulus strength perceived is approximately propoionate to the log of the intensity of stimulus strengthMagnitude of stimulus strength perceived is directly propoional to the intensity of stimulus strengthThreshold of receptor is directly propoional to stimulus strengthThreshold of receptor is inversely propoional to stimulus strength  <response>: The intensity of sensation is determined by the amplitude of the stimulus applied to the receptor. Action potentials in an afferent fiber from a mechanoreceptor of a single sensory unit increase in frequency as branches of the afferent neuron are stimulated by pressure of increasing magnitude. The magnitude of sensation felt is propoional to the log of the intensity of the stimulus is called the Weber-Fechner law. RKSA R Sensation felt. S Intensity of the stimulus. and for any specific sensory modality, K and A are constants. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. 2012. Chapter 8. Somatosensory Neurotransmission: Touch, Pain, and Temperature. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks Eds, Ganongs Review of Medical Physiology, 24e. 