My research explores the fundamental building blocks of human language, and how languages differ in their realization. I pursue this research focusing on three empirical domains: traditional grammatical categories, categories belonging to interactional language, and the linguistic profiles in neuro-diverse populations. I do this by using the framework I developed In my 2014 monograph: the Universal Spine Hypothesis according to which the grammar of all languages (including interactional language) are constrained by a set of hierarchically organized universal functions (the spine). The question raised by the language profile of neuro-diverse populations is that it involves a different type of language variation, one in which the spine itself may be affected. Thus, my research links to neighboring fields, including philosophy (referential semantics, pragmatics), sociology (conversation analysis), and psychology (theory of mind).
Der Mensch spricht, sogar in Gedanken,
nur mit einem Andren, oder mit sich, wie mit einem Andren
W. von Humboldt
Language changes in conversation. We don't always speak in full sentences. And we add little words, phrases and intonational tunes to modify what we say. They facilitate interaction in that they regulate the managment of common ground as well as how we take turns.
Until recently interactional language has not received much attention in the generative literature, likely because they are restricted to languge in use, which is something generativists have abstracted away from.
When I started working on Halkomelem (Salish) I didn't know how to begin to draw trees for sentences. The problem, I realized, was that languages differ in their categorial inventories. Yet, these categories fall into some regular patterns (they are hierarchically organized, they display patterns of contrast and multi-functionality).
This points to an underlying categorization mechanism that creates hierarchically organized functional catgeories.
The Universal Spine Hypothesis (USH) seeks to model this: language-specific units of language (UoLs) can associate with the spine in different ways. And if a UoL associates with the spine as a head, it makes a grammatical category. This derives variation in catgeorial inventories: since language-specific UoLs are essential in deriving grammatical categories, they, too, are necessarily language-specific though constrained by the spine. And crucially, the spine will add meaningful content to these UoLs deriving multi-functionality.
I have been thinking about pronouns since 1995, and they have never left me. They give us a condensed version of the spine, like a trailer to a movie.
My interest in pronouns started with the observation that German d-pronouns cannot be bound, unlike personal pronouns. So what makes them special. It took me a year to realize that they walk like determiners, and talk like determiners....
And this lead to the realization that pronouns are not a unified class: depending on the category of the spine they instantiate, they have different properties, including their binding properties. So D-pronouns, differ from phi-pronouns., etc. And the same holds for reflexives: depending on their category, their "reflexivity" is derived in different ways.
And most recently, Elizabeth Ritter and I have explored the properties of so-called pronouns in East Asian languages, which have very different properties. We argue that they are UoLs that associate with the interactional spine, hence they are not bundles of phi-features. We call them paranouns. They are neither nouns, nor pronouns. They contain socio-linguistic information about the interactants and the relation among them.
I have begun to think about the significance of the particular language profiles of people with neuro-diverse profiles (schiophrenia, autism spectrum, aphasia, alheimer's). This is in collaboration with Wolfram Hinzen, and his GracLab, at UPF.
Following Hinzen's uncartesian ideas according to which language configures thought, it follows that the language of people with different types of thoughts will have a different language profile.
I am currently developing a formal typology for language variation that is based on variation in properties of the spine (including the interactional spine) rather than merely in the properties of UoLs (as is the case with language variation in neuro-typical populations. The Interactional Spine Hypothesis provides us with an ideal framework as these neuro-diversities are typically characterized as displaying differences in language and social cognition. At the same time, exploring language in neuro-diverse populations allows us to ask questions about the cognitive underpinnings of the (interactional) spine.
There are some pieces of my work that do not fall neatly into any of the categories that I defined for my research. So here they are makeing for an elsewhere category: Everything else I did.
It's not much, in fact. Which some years ago I wouldn't have expected as I sometimes thought that I work on many unrelated things.
But it turned out there was a order in the chaos and I was following a particular path.
And that's what I will keep doing.