But the link between mathematical psychology, decision theory, and
behavioral decision research also went much further than the mere use of
mathematics. Mathematical psychology’s representational theory of measurement and
behavioral decision research’s experimental investigation of human decision making
started from different perspectives, but were partly about the same subject: normative
decision behavior. Mathematical psychology’s representational theory of
measurement used the human body as a measurement device. In the case of utilities
and probabilities, for instance, the human being was used to measure human
perception of utilities and probabilities, human perception of risk averseness, and
human perception of loss averseness. But in order to make this a valid procedure it
must be assumed that the human being as a measurement device functions
consistently. Furthermore, the representational theory of measurement’s definition of
consistency was: according to the normative rules of decision theory. The assumption
needed to be made was that the human measuremen