Jonathan Peirce created a widely used Python library for this subfield that can handle experimental setups like two-interval forced choice. In this subfield, G. S. Brindley defined the metameric Rayleigh match as a “Class A” observation, in contrast to “Class B” observations of the Muller–Lyer figures. This subfield’s staircase procedure tracks the reversal of responses instead of the classical method of limits. In this subfield, the Stevens power law ѱ = kSn (“psi equals k S to the n”) is applied by referencing a table of exponents for (*) continua like duration and vibration. Weber’s (“VAY-bur”) Law and Fechner’s (10[2])(“FEK-nur”) Law (-5[1])established this subfield (10[1]-5[1])in the 19th century by theorizing (-5[1])the just-noticeable difference. (10[2]-5[1])For 10 points, the relationship between stimulus and sensation is studied in what subfield whose name combines psychology with one of the natural sciences? ■END■ (10[2]0[3])