#language faculty
Hauser, Chomsky and Fitch (HCF) wrote a paper in 2002 entitled The faculty of language: what is it, who has it, and how did it evolve? It explicitly introduced an important distinction between the Faculty of Language in the Broad Sense (FLB) and the Faculty of Language in the Narrow Sense (FLN).
FLB is made up of all the components used in language, e.g. ability for vocal learning, ability to conceptualise, a sensori-motor system, a computational system (syntax) capable of recursion etc. FLN is a subset of FLB, i.e. everything in FLN is also in FLB but not vice versa. More specifically, FLN contains only those components of FLB which are uniquely human. HCF hypothesise that FLN only contains recursion and that all other aspects of language (i.e. what constitutes the rest of FLB) can be found in non-human species.
You might not agree with HCF in terms of what to assign to FLN, but the general distinction is both useful and perhaps necessary for tackling the issue of language evolution. The first question of HCF’s title (what is it?) involves filling in the FLB category – and obviously we need to know what it is we are trying to explain the evolution of! The second question (who has it?) involves deciding whether something belongs to FLN as well. If we put something in the FLN box, we are saying it is uniquely human. This can be tested (in principle – how easy it is to test is another matter!) and this is one place where interdisciplinary research between biology and linguistics can be very fruitful and informative. Basically, from an evolution of language perspective, we want to know what exactly (if anything) makes human language special. This then leads to the third question – we can ask how the uniquely human part of language evolved, i.e. we can ask how did FLN evolve rather than the much larger question of how did FLB evolve.
Of course, having done all that, FLN might turn out to be empty! Perhaps human language is not qualitatively different, only quantitatively different. But let’s wait to see what we find!
