Methodological functionalism and the description of natural systems

The primary way that explanations are constructed in cognitive psychology is by methodological functionalism: in short, functionally defined components are proposed in order to explain how inputs (i.e., stimuli from the environment) are turned into behavior. But despite its close association with cognitive psychology, methodological functionalism is a technique that can be used to describe any natural system. I look at how methodological functionalism has fared when used by other special sciences and what lessons can be learned from these cases. Three explanations of chemical and biological systems that were developed using methodological functionalism are examined: Willis’s (1684) explanation of fermentation, Farr’s (mid-1800s) explanation of cholera, and Mendel’s (mid-1800s) explanation of inheritance. The discovery of HIV in the early 1980s, an investigation that rejected methodological functionalism early on, is also discussed. The assessment of methodological functionalism is not positive. This technique has limitations. The implications for cognitive psychology are considered, and one conclusion is that cognitive psychology will eventually cease relying on methodological functionalism.