Intensity of sensory stimulation is directly related to:
Duration of action potential (AP)
Frequency of AP
Amplitude of AP
All of the above.
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 intensities)by 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 law*It 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
Nerve Physiology