Language Log

What constitutes a language has been of interest to diverse disciplines—from philosophy and linguistics to psychology, anthropology, and sociology. An empirical approach is to test whether the system in question recruits the brain system that processes natural languages. Despite their similarity to natural languages, math and programming languages recruit a distinct brain system. Using fMRI, we test brain responses to constructed languages (conlangs)—which share features with both natural languages and programming languages—and find that they are processed by the same brain network as natural languages. Thus, an ability for a symbolic system to express diverse meanings about the world—but not the recency, manner, and purpose of its creation, or a large user base—is a defining characteristic of a language.