<prompt> Intensity of sensory stimulation is directly related to:Duration of action potential APFrequency of APAmplitude of APAll of the above.  <response>: Ans. is b i.e. Frequency of Action potential There are two methods by which brain detects the intensity of a sensory stimulus differentiates between two stimuli of different intensitiesby variation in the frequency of the action potentials generated by the stimulus in a given receptor.By variation in the number of receptors activated by the stimulus.Also knowWeber - Fechner lawIt states that the magnitude of the sensation felt in proportionate to the log of intensity of the stimulus.Example - A person holding 30 grams weight in his hand can barely detect a 1 gm rise in weight a rise than 1 gm would not be detectable. But when he holds 300 gm of weighty he can rarely detect a 10 gm increase in weight a rise less than 10 gm would not be detectable to him. So a 300 gm wt. and Say 307 gm of weights would appear same to him.This is expressed mathematically asInterpreted signal strength Log x stimulus intensity constant 