The qunatification of respiratory sensations by normal subjects

The technique of open magnitude scaling was used in normal subjects to define the exponent (n) of Stevens; psychophysical power law for four respiratory variables: tidal volume (VT), inspiratory flow (V), ventilation (Ve), and frequency (f). Stevens' psychophysical law states that the perceived magnitude (psi) of a stimulus is related to the physical magnitude (phi) by a constant (k) and an exponent (n): psi = kappaphin. The mean value of n was …