Syntax
Head-Directionality
Head-initial vs head-final — the parameter behind word-order typology
Head-directionality is a typological parameter describing whether the head of a phrase precedes (head-initial) or follows (head-final) its complements. In English, a head-initial language, the verb precedes its object ("eat sushi"), the preposition precedes its noun ("on the table"), and the noun precedes its complement clause ("the claim that he left"). In Japanese, a head-final language, all of these reverse: "sushi-o tabe-ru" (sushi-OBJ eat), "tsukue-no ue-ni" (table-GEN top-LOC), "kare-ga deta to iu shuchō" (he-NOM left COMP say claim). This single parameter, proposed by Joseph Greenberg (1963) and theorized by Mark Baker (2001) and others, predicts dozens of correlated properties. SVO vs SOV order, prepositions vs postpositions, auxiliary placement, relative clause position — all cluster.
- Two valuesHead-initial / head-final
- Head-initial exampleEnglish, Spanish, Mandarin
- Head-final exampleJapanese, Korean, Turkish, Hindi
- Mixed exampleGerman (V2 + OV)
- Proposed byJoseph Greenberg (1963 universals)
- PredictsV-O order, P-NP order, NP-Rel order, etc.
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Why head-directionality matters
- Typology. Single parameter predicts cross-categorial word order.
- L2 acquisition. English speakers learning Japanese must reset the parameter.
- Syntactic theory. Foundation of X-bar and minimalism.
- Parsing models. Head-final languages require different incremental strategies.
- Translation. Reordering whole subtrees, not just words.
- Language change. Drift between head-initial and head-final correlates.
- Universals research. Tests Greenberg's typological claims.
Common misconceptions
- Languages are purely one or the other. Many are mixed (German, Mandarin).
- SOV = head-final automatically. Strong tendency, not absolute.
- Word order is independent of phrase structure. Word order is phrase order.
- Head-final = harder. No evidence head-final languages are harder to acquire.
- Head-directionality covers all word order. Subject position, scrambling, focus all add layers.
- Parameter is innate. Usage-based linguists dispute the parametric view entirely.
Frequently asked questions
What is the head of a phrase?
The element that determines the phrase's category and meaning. In a verb phrase ("eat sushi"), the verb "eat" is head and "sushi" is complement. In a prepositional phrase ("on the table"), the preposition is head. In a noun phrase ("the picture of Mary"), the noun "picture" is head. Phrases are projections of their head: VP from V, NP from N, PP from P. Head identification is foundational to X-bar theory.
What does head-initial mean concretely?
Heads come before complements. English VP: V before NP ("read books"). PP: P before NP ("in Paris"). NP: N before complement ("the king of Spain"). Adjective phrase: A before complement ("proud of his son"). Auxiliary before main verb ("will go"). Complementizer before clause ("that he left"). All consistent — that's what makes English typologically clean.
What does head-final mean concretely?
Heads come after complements. Japanese VP: NP before V ("hon-o yom-u" book-OBJ read). PP becomes postpositional: NP before P ("Tokyo-de" Tokyo-LOC). NP: complement before N ("Supein-no ō" Spain-GEN king). Auxiliary after main verb. Complementizer after clause. Japanese is the textbook clean head-final language.
Are languages always consistent?
No. German is famously mixed: head-initial in main clauses (V2: "Ich esse Sushi") but head-final in subordinate clauses ("dass ich Sushi esse"). Mandarin is mostly head-initial but has prenominal relative clauses (head-final at NP level). Persian has prepositions but verb-final. The "parameter" is more of a tendency cluster than an absolute switch.
How does it relate to Greenberg's universals?
Joseph Greenberg's 1963 paper "Some Universals of Grammar" proposed 45 implicational universals. Many turn on word order: "If a language has dominant SOV order, it almost always has postpositions" (Universal 4). Head-directionality unifies these — they all reduce to the head-complement order parameter. Hawkins (1983) refined this into Cross-Category Harmony.
What's the principles-and-parameters view?
Chomsky (1981) proposed that children acquire language by setting a small number of binary parameters. Head-directionality is the canonical example: one switch, dozens of consequences. A child hearing "I see John" sets head-initial; a child hearing "watashi-wa John-o miru" sets head-final. Other parameters: pro-drop, V2, subject-in-Spec. The parameter approach has been challenged by usage-based models.
What about V2 languages?
Verb-Second languages (German, Dutch, Icelandic) place the finite verb in second position regardless of what's first. "Heute esse ich Sushi" (Today eat I sushi) — verb second. This breaks with simple head-directionality and is captured by movement: the verb moves to C° in main clauses but stays in V° in embedded clauses, where head-final order reemerges.