While Hick was stating that the relationship between reaction time and the number of choices was logarithmic, Hyman wanted to better understand the relationship between the reaction time and the mean number of choices.
Mens Hick fandt, at forholdet mellem reaktionstiden og antallet af valgmuligheder var logaritmisk, ønskede Hyman bedre at forstå forholdet mellem reaktionstid og det gennemsnitlige antal af valgmuligheder.