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Compounds are generally divided in those that involve a dependency (subordinate and attributive) relation of one constituent upon the other and those where there is coordination, for which there is much controversy on delimiting the exact borders. This article offers an overview of compounds belonging to the second type, for which the term ‘coordinative’ is adopted, as more general and neutral, drawn from a wide range of terms that have been proposed in the literature. It attempts to provide a definition on the basis of structural and semantic criteria, describes the major features of coordinative compounds and discusses crucial issues that play a significant role to their formation and meaning, such as those of headedness, the order of constituents, and compositionality. Showing that languages vary with respect to the frequency and types of coordinative compounds, being unclear in which way these constructions are distributed and used cross-linguistically, it tries to give a classification with extensive exemplification from genetically and typologically diverse languages.
The term coordination refers to the juxtaposition of two or more conjuncts often linked by a conjunction such as and or or. The conjuncts (e.g., our friend and your teacher in Our friend and your teacher sent greetings) may be words or phrases of any type. They are a defining property of coordination, while the presence or absence of a conjunction depends on the specifics of the particular language. As a general phenomenon, coordination differs from subordination in that the conjuncts are typically symmetric in many ways: they often belong to like syntactic categories, and if nominal, each carries the same case. Additionally, if there is extraction, this must typically be out of all conjuncts in parallel, a phenomenon known as Across-the-Board extraction. Extraction of a single conjunct, or out of a single conjunct, is prohibited by the Coordinate Structure Constraint. Despite this overall symmetry, coordination does sometimes behave in an asymmetric fashion. Under certain circumstances, the conjuncts may be of unlike categories or extraction may occur out of one conjunct, but not another, thus yielding apparent violations of the Coordinate Structure Constraint. In addition, case and agreement show a wide range of complex and sometimes asymmetric behavior cross-linguistically. This tension between the symmetric and asymmetric properties of coordination is one of the reasons that coordination has remained an interesting analytical puzzle for many decades.
Within the general area of coordination, a number of specific sentence types have generated much interest. One is Gapping, in which two sentences are conjoined, but material (often the verb) is missing from the middle of the second conjunct, as in Mary ate beans and John _ potatoes. Another is Right Node Raising, in which shared material from the right edge of sentential conjuncts is placed in the right periphery of the entire sentence, as in The chefs prepared __ and the customers ate __ [a very elaborately constructed dessert]. Finally, some languages have a phenomenon known as comitative coordination, in which a verb has two arguments, one morphologically plural and the other comitative (e.g., with the preposition with), but the plural argument may be understood as singular. English does not have this phenomenon, but if it did, a sentence like We went to the movies with John could be understood as John and I went to the movies.
Marcel den Dikken and Teresa O’Neill
Copular sentences (sentences of the form A is B) have been prominent on the research agenda for linguists and philosophers of language since classical antiquity, and continue to be shrouded in considerable controversy. Central questions in the linguistic literature on copulas and copular sentences are (a) whether predicational, specificational, identificational, and equative copular sentences have a common underlying source; and, if so, (b) how the various surface types of copular sentences are derived from that underlier; (c) whether there is a typology of copulas; and (d) whether copulas are meaningful or meaningless.
The debate surrounding the postulation of multiple copular sentence types relies on criteria related to both meaning and form. Analyses based on meaning tend to focus on the question of whether or not one of the terms is a predicate of the other, whether or not the copula contributes meaning, and the information-structural properties of the construction. Analyses based on form focus on the flexibility of the linear ordering of the two terms of the construction, the surface distribution of the copular element, the restrictions imposed on the extraction of the two terms, the case and agreement properties of the construction, the omissibility of the copula or one of the two terms, and the connectivity effects exhibited by the construction.
Morphosyntactic variation in the domain of copular elements is an area of research with fruitful intersections between typological and generative approaches. A variety of criteria are presented in the literature to justify the postulation of multiple copulas or underlying representations for copular sentences. Another prolific body of research concerns the semantics of copular sentences. In the assessment of scholarship on copulas and copular sentences, the article critiques the ‘multiple copulas’ approach and examines ways in which the surface variety of copular sentence types can be accounted for in a ‘single copula’ analysis. The analysis of copular constructions continues to have far-reaching consequences in the context of linguistic theory construction, particularly the question of how a predicate combines with its subject in syntactic structure.
Definition of the copula as a discrete grammatical category is problematic. It is the semantically unmarked copulas (simple equivalents of the English verb ‘to be’) which deserve most attention in a comparison of the Romance languages; they have a typically suppletive historical morphology and are often the result of the grammaticalization of full lexical verbs, the point at which true unmarked copular status is achieved being sometimes difficult to identify. The unmarked copulas of the Ibero-Romance languages (Spanish, Portuguese, and Catalan) have the most complex distribution and have proved the most difficult to account for synchronically.
The situation in the early 21st century is the consequence of a progressive encroachment of the reflexes of Latin stare and other verbs on the functions of Latin esse (reference is made to the Classical Latin form esse for convenience; however, the Romance paradigms must be taken to derive from a Vulgar Latin form *essĕre, into which other verbs, notably sedēre ‘to sit’ in the case of the Ibero-Romance languages, were suppletively incorporated). The contrastive study of the development of cognate copular verbs in closely related languages needs closer attention in regard to the identification of the parameters of copula choice with adjectival complements.
Corpus Phonology is an approach to phonology that places corpora at the center of phonological research. Some practitioners of corpus phonology see corpora as the only object of investigation; others use corpora alongside other available techniques (for instance, intuitions, psycholinguistic and neurolinguistic experimentation, laboratory phonology, the study of the acquisition of phonology or of language pathology, etc.). Whatever version of corpus phonology one advocates, corpora have become part and parcel of the modern research environment, and their construction and exploitation has been modified by the multidisciplinary advances made within various fields. Indeed, for the study of spoken usage, the term ‘corpus’ should nowadays only be applied to bodies of data meeting certain technical requirements, even if corpora of spoken usage are by no means new and coincide with the birth of recording techniques. It is therefore essential to understand what criteria must be met by a modern corpus (quality of recordings, diversity of speech situations, ethical guidelines, time-alignment with transcriptions and annotations, etc.) and what tools are available to researchers. Once these requirements are met, the way is open to varying and possibly conflicting uses of spoken corpora by phonological practitioners. A traditional stance in theoretical phonology sees the data as a degenerate version of a more abstract underlying system, but more and more researchers within various frameworks (e.g., usage-based approaches, exemplar models, stochastic Optimality Theory, sociophonetics) are constructing models that tightly bind phonological competence to language use, rely heavily on quantitative information, and attempt to account for intra-speaker and inter-speaker variation. This renders corpora essential to phonological research and not a mere adjunct to the phonological description of the languages of the world.
Creole languages have a curious status in linguistics, and at the same time they often have very low prestige in the societies in which they are spoken. These two facts may be related, in part because they circle around notions such as “derived from” or “simplified” instead of “original.” Rather than simply taking the notion of “creole” as a given and trying to account for its properties and origin, this essay tries to explore the ways scholars have dealt with creoles. This involves, in particular, trying to see whether we can define “creoles” as a meaningful class of languages. There is a canonical list of languages that most specialists would not hesitate to call creoles, but the boundaries of the list and the criteria for being listed are vague. It also becomes difficult to distinguish sharply between pidgins and creoles, and likewise the boundaries between some languages claimed to be creoles and their lexifiers are rather vague.
Several possible criteria to distinguish creoles will be discussed. Simply defining them as languages of which we know the point of birth may be a necessary, but not sufficient, criterion. Displacement is also an important criterion, necessary but not sufficient. Mixture is often characteristic of creoles, but not crucial, it is argued. Essential in any case is substantial restructuring of some lexifier language, which may take the form of morphosyntactic simplification, but it is dangerous to assume that simplification always has the same outcome. The combination of these criteria—time of genesis, displacement, mixture, restructuring—contributes to the status of a language as creole, but “creole” is far from a unified notion. There turn out to be several types of creoles, and then a whole bunch of creole-like languages, and they differ in the way these criteria are combined with respect to them.
Thus the proposal is made here to stop looking at creoles as a separate class, but take them as special cases of the general phenomenon that the way languages emerge and are used to a considerable extent determines their properties. This calls for a new, socially informed typology of languages, which will involve all kinds of different types of languages, including pidgins and creoles.
Cyclicity in syntax constitutes a property of derivations in which syntactic operations apply bottom-up in the production of ever larger constituents. The formulation of a principle of grammar that guarantees cyclicity depends on whether structure is built top-down with phrase structure rules or bottom-up with a transformation Merge. Considerations of minimal and efficient computation motivate the latter, as well as the formulation of the cyclic principle as a No Tampering Condition on structure-building operations (Section 3.3) without any reference to special cyclic domains in which operations apply (as in the formulation of the Strict Cycle Condition (Section 2) and its predecessors (Section 1)) or any reference to extending a phrase marker (the Extension Condition (Section 3)). Ultimately, the empirical effects of a No Tampering Condition on structure building, which conform to strict cyclicity, follow from the formulation of the Merge operation as strictly binary. This leaves as open questions whether displacement (movement) must involve covert intermediate steps (successive cyclic movement) and whether derivations of the two separate interface representations (Phonetic Form and Logical Form) occur in parallel as a single cycle.
Morphological defectiveness refers to situations where one or more paradigmatic forms of a lexeme are not realized, without plausible syntactic, semantic, or phonological causes. The phenomenon tends to be associated with low-frequency lexemes and loanwords. Typically, defectiveness is gradient, lexeme-specific, and sensitive to the internal structure of paradigms.
The existence of defectiveness is a challenge to acquisition models and morphological theories where there are elsewhere operations to materialize items. For this reason, defectiveness has become a rich field of research in recent years, with distinct approaches that view it as an item-specific idiosyncrasy, as an epiphenomenal result of rule competition, or as a normal morphological alternation within a paradigmatic space.
William F. Hanks
Deictic expressions, like English ‘this, that, here, and there’ occur in all known human languages. They are typically used to individuate objects in the immediate context in which they are uttered, by pointing at them so as to direct attention to them. The object, or demonstratum is singled out as a focus, and a successful act of deictic reference is one that results in the Speaker (Spr) and Addressee (Adr) attending to the same referential object. Thus,
(1)A:Oh, there’sthat guy again (pointing)B:Oh yeah, now I see him (fixing gaze on the guy)
(2)A:I’ll have that one over there (pointing to a dessert on a tray)B:This? (touching pastry with tongs)A:yeah, that looks greatB:Here ya’ go (handing pastry to customer)
In an exchange like (1), A’s utterance spotlights the individual guy, directing B’s attention to him, and B’s response (both verbal and ocular) displays that he has recognized him. In (2) A’s utterance individuates one pastry among several, B’s response makes sure he’s attending to the right one, A reconfirms and B completes by presenting the pastry to him. If we compare the two examples, it is clear that the underscored deictics can pick out or present individuals without describing them. In a similar way, “I, you, he/she, we, now, (back) then,” and their analogues are all used to pick out individuals (persons, objects, or time frames), apparently without describing them. As a corollary of this semantic paucity, individual deictics vary extremely widely in the kinds of object they may properly denote: ‘here’ can denote anything from the tip of your nose to planet Earth, and ‘this’ can denote anything from a pastry to an upcoming day (this Tuesday). Under the same circumstance, ‘this’ and ‘that’ can refer appropriately to the same object, depending upon who is speaking, as in (2). How can forms that are so abstract and variable over contexts be so specific and rigid in a given context? On what parameters do deictics and deictic systems in human languages vary, and how do they relate to grammar and semantics more generally?
Dene-Yeniseian is a proposed genealogical link between the widespread North American language family Na-Dene (Athabaskan, Eyak, Tlingit) and Yeniseian in central Siberia, represented today by the critically endangered Ket and several documented extinct relatives. The Dene-Yeniseian hypothesis is an old idea, but since 2006 new evidence supporting it has been published in the form of shared morphological systems and a modest number of lexical cognates showing interlocking sound correspondences. Recent data from human genetics and folklore studies also increasingly indicate the plausibility of a prehistoric (probably Late Pleistocene) connection between populations in northwestern North America and the traditionally Yeniseian-speaking areas of south-central Siberia. At present, Dene-Yeniseian cannot be accepted as a proven language family until the purported evidence supporting the lexical and morphological correspondences between Yeniseian and Na-Dene is expanded and tested by further critical analysis and their relationship to Old World families such as Sino-Tibetan and Caucasian, as well as the isolate Burushaski (all earlier proposed as relatives of Yeniseian, and sometimes also of Na-Dene), becomes clearer.
Denominal verbs are verbs formed from nouns by means of various word-formation processes such as derivation, conversion, or less common mechanisms like reduplication, change of pitch, or root and pattern. Because their well-formedness is determined by morphosyntactic, phonological, and semantic constraints, they have been analyzed from a variety of lexicalist and non-lexicalist perspectives, including Optimality Theory, Lexical Semantics, Cognitive Grammar, Onomasiology, and Neo-Construction Grammar. Independently of their structural shape, denominal verbs have in common that they denote events in which the referents of their base nouns (e.g., computer in the case of computerize) participate in a non-arbitrary way. While traditional labels like ‘ornative’, ‘privative’, ‘locative’, ‘instrumental’ and the like allow for a preliminary classification of denominal verbs, a more formal description has to account for at least three basic aspects, namely (1) competition among functionally similar word-formation patterns, (2) the polysemy of affixes, which precludes a neat one-to-one relation between derivatives displaying a particular affix and a particular semantic class, and (3) the relevance of generic knowledge and contextual information for the interpretation of (innovative) denominal verbs.
Deponency refers to mismatches between morphological form and syntactic function (or “meaning”), such that a given morphological exponent appears in a syntactic environment that is unexpected from the point of view of its canonical (“normal” or “expected”) function. This phenomenon takes its name from Latin, where certain morphologically “passive” verbs appear in syntactically active contexts (for example, hort-or ‘I encourage’, with the same ending as passive am-or ‘I am loved’), but it occurs in other languages as well. Moreover, the term has been extended to include mismatches in other domains, such as number mismatches in nominal morphology or tense mismatches on verbs (e.g., in the Germanic preterite-presents). Theoretical treatments of deponency vary from seeking a unified (and uniform) account of all observed mismatches to arguing that the wide range of cross-linguistically attested form-function mismatches does not form a natural class and does not require explanatory devices specific to the domain of morphology. It has also been argued that some apparent mismatches are “spurious” and have been misanalyzed.
Nevertheless, it is generally agreed across frameworks that however such “morphological mismatches” are to be analyzed, deponency has potential ramifications for theories of the syntax-morphology interface and (depending on one’s theoretical approach) the structure of the lexicon.
Željko Bošković and Troy Messick
Economy considerations have always played an important role in the generative theory of grammar. They are particularly prominent in the most recent instantiation of this approach, the Minimalist Program, which explores the possibility that Universal Grammar is an optimal way of satisfying requirements that are imposed on the language faculty by the external systems that interface with the language faculty which is also characterized by optimal, computationally efficient design. In this respect, the operations of the computational system that produce linguistic expressions must be optimal in that they must satisfy general considerations of simplicity and efficient design. Simply put, the guiding principles here are (a) do something only if you need to and (b) if you do need to, do it in the most economical/efficient way. These considerations ban superfluous steps in derivations and superfluous symbols in representations. Under economy guidelines, movement takes place only when there is a need for it (with both syntactic and semantic considerations playing a role here), and when it does take place, it takes place in the most economical way: it is as short as possible and carries as little material as possible. Furthermore, economy is evaluated locally, on the basis of immediately available structure. The locality of syntactic dependencies is also enforced by minimal search and by limiting the number of syntactic objects and the amount of structure accessible in the derivation. This is achieved by transferring parts of syntactic structure to the interfaces during the derivation, the transferred parts not being accessible for further syntactic operations.
Derivational morphology is a type of word formation that creates new lexemes, either by changing syntactic category or by adding substantial new meaning (or both) to a free or bound base. Derivation may be contrasted with inflection on the one hand or with compounding on the other. The distinctions between derivation and inflection and between derivation and compounding, however, are not always clear-cut. New words may be derived by a variety of formal means including affixation, reduplication, internal modification of various sorts, subtraction, and conversion. Affixation is best attested cross-linguistically, especially prefixation and suffixation. Reduplication is also widely found, with various internal changes like ablaut and root and pattern derivation less common. Derived words may fit into a number of semantic categories. For nouns, event and result, personal and participant, collective and abstract noun are frequent. For verbs, causative and applicative categories are well-attested, as are relational and qualitative derivations for adjectives. Languages frequently also have ways of deriving negatives, relational words, and evaluatives. Most languages have derivation of some sort, although there are languages that rely more heavily on compounding than on derivation to build their lexical stock. A number of topics have dominated the theoretical literature on derivation, including productivity (the extent to which new words can be created with a given affix or morphological process), the principles that determine the ordering of affixes, and the place of derivational morphology with respect to other components of the grammar. The study of derivation has also been important in a number of psycholinguistic debates concerning the perception and production of language.
Determiners are a nominal syntactic category distinct from both adjectives and nouns; they constitute a functional (aka closed or ‘minor’) category and they are typically located high inside the nominal phrasal structure.
From a syntactic point of view, the category of determiners is commonly understood to comprise the word classes of article, demonstrative, and quantifier, as well as non-adjectival possessives and some nominal agreement markers.
From a semantic point of view, determiners are assumed to function as quantifiers, especially within research informed by Generalized Quantifier Theory. However, this is a one-way entailment: although determiners in natural language are quantificational, their class contains only a subset of the logically possible quantifiers; this class is restricted by conservativity and other factors.
The tension between the ‘syntactic’ and the ‘semantic’ perspective on determiners results to a degree of terminological confusion: it is not always clear which lexical items the Determiner category includes or what the function of determiners is; moreover, there exists a tendency among syntacticians to view ‘Determiner’ as naming not a class, but a fixed position within a nominal phrasal template.
The study of determiners rose to prominence within grammatical theory during the ’80s both due to advances in semantic theorizing, primarily Generalized Quantifier Theory, and due to the generalization of the X' phrasal schema to functional (minor) categories. Some issues in the nature and function of determiners that have been addressed in theoretical and typological work with considerable success include the categorial status of determiners, their (non-)universality, their structural position and feature makeup, their role in argumenthood and their interaction with nominal predicates, and their relation to pronouns. Expectedly, issues in (in)definiteness, quantification, and specificity also figure prominently in research work on determiners.
The field of dialectology, the study of the language of an area or group of people, has a long tradition within linguistics. From the earliest dialect studies, a focus on rigorous methodological practices has been an ever-present component of this discipline. Traditional methodologies can be seen in the work of the early dialect atlases, which relied heavily on mail questionnaires or fieldworkers that would chronicle the pronunciation, grammatical features, and lexicon of residents of particular regions. More recent technological innovations, such as GIS and online survey methods and applications, have brought multidisciplinary approaches to the study of dialects, as well as allowing for broader and more robust studies of geographic areas and social groups.
The influence and interface of dialectology on various linguistic disciplines is noteworthy. Dialectological methods have most commonly been utilized in historical linguistics, sociolinguistics/language variation and change, and language endangerment/documentation. Within each of these disciplines, the adoption of methods from dialectology has allowed for the systematic study of language across geographic and social space, as well as across time.
Diglossia refers to a situation where two linguistic varieties coexist within a given speech community. One variety, labeled the ‘high variety’, is used in formal domains including education, while the other variety, labeled the ‘low variety’, is used principally in instances of informal extemporaneous communication. The domains of use, however, are not strictly separate and especially so with the increase in electronic modes of communication. This results in what has been described as diglossic code-switching, and the gradual encroaching of, in the case under consideration here, vernacular Arabic upon the domains of use of Standard Arabic.
While the genetic relationship between the two varieties is central in the definition of a classical diglossic situation as in the case of Arabic, the concept of diglossia has often been extended in the literature to cover situations of a functional distribution between languages that are genetically distant, such as with the situation of Spanish and Guaraní in Paraguay.
In North Africa, vernacular Arabic is in a classical diglossic distribution with Standard Arabic, while the Berber languages are often described as existing in a situation of extended diglossia with Arabic. However, distinguishing between diglossia as it exists between the Arabic dialects and Standard Arabic and the situation of bilingualism that involves Arabic, Berber, and European languages provides the best framework for describing the linguistic situation in North Africa. Diglossia is a key element in understanding the mechanisms of the region’s language contact and change as it plays a central role in shaping language attitude, language policy, and language planning.
Carol A. Fowler
The theory of speech perception as direct derives from a general direct-realist account of perception. A realist stance on perception is that perceiving enables occupants of an ecological niche to know its component layouts, objects, animals, and events. “Direct” perception means that perceivers are in unmediated contact with their niche (mediated neither by internally generated representations of the environment nor by inferences made on the basis of fragmentary input to the perceptual systems). Direct perception is possible because energy arrays that have been causally structured by niche components and that are available to perceivers specify (i.e., stand in 1:1 relation to) components of the niche. Typically, perception is multi-modal; that is, perception of the environment depends on specifying information present in, or even spanning, multiple energy arrays.
Applied to speech perception, the theory begins with the observation that speech perception involves the same perceptual systems that, in a direct-realist theory, enable direct perception of the environment. Most notably, the auditory system supports speech perception, but also the visual system, and sometimes other perceptual systems. Perception of language forms (consonants, vowels, word forms) can be direct if the forms lawfully cause specifying patterning in the energy arrays available to perceivers. In Articulatory Phonology, the primitive language forms (constituting consonants and vowels) are linguistically significant gestures of the vocal tract, which cause patterning in air and on the face. Descriptions are provided of informational patterning in acoustic and other energy arrays. Evidence is next reviewed that speech perceivers make use of acoustic and cross modal information about the phonetic gestures constituting consonants and vowels to perceive the gestures.
Significant problems arise for the viability of a theory of direct perception of speech. One is the “inverse problem,” the difficulty of recovering vocal tract shapes or actions from acoustic input. Two other problems arise because speakers coarticulate when they speak. That is, they temporally overlap production of serially nearby consonants and vowels so that there are no discrete segments in the acoustic signal corresponding to the discrete consonants and vowels that talkers intend to convey (the “segmentation problem”), and there is massive context-sensitivity in acoustic (and optical and other modalities) patterning (the “invariance problem”). The present article suggests solutions to these problems.
The article also reviews signatures of a direct mode of speech perception, including that perceivers use cross-modal speech information when it is available and exhibit various indications of perception-production linkages, such as rapid imitation and a disposition to converge in dialect with interlocutors.
An underdeveloped domain within the theory concerns the very important role of longer- and shorter-term learning in speech perception. Infants develop language-specific modes of attention to acoustic speech signals (and optical information for speech), and adult listeners attune to novel dialects or foreign accents. Moreover, listeners make use of lexical knowledge and statistical properties of the language in speech perception. Some progress has been made in incorporating infant learning into a theory of direct perception of speech, but much less progress has been made in the other areas.
Dispersion Theory concerns the constraints that govern contrasts, the phonetic differences that can distinguish words in a language. Specifically it posits that there are distinctiveness constraints that favor contrasts that are more perceptually distinct over less distinct contrasts. The preference for distinct contrasts is hypothesized to follow from a preference to minimize perceptual confusion: In order to recover what a speaker is saying, a listener must identify the words in the utterance. The more confusable words are, the more likely a listener is to make errors. Because contrasts are the minimal permissible differences between words in a language, banning indistinct contrasts reduces the likelihood of misperception.
The term ‘dispersion’ refers to the separation of sounds in perceptual space that results from maximizing the perceptual distinctiveness of the contrasts between those sounds, and is adopted from Lindblom’s Theory of Adaptive Dispersion, a theory of phoneme inventories according to which inventories are selected so as to maximize the perceptual differences between phonemes. These proposals follow a long tradition of explaining cross-linguistic tendencies in the phonetic and phonological form of languages in terms of a preference for perceptually distinct contrasts.
Flemming proposes that distinctiveness constraints constitute one class of constraints in an Optimality Theoretic model of phonology. In this context, distinctiveness constraints predict several basic phenomena, the first of which is the preference for maximal dispersion in inventories of contrasting sounds that first motivated the development of the Theory of Adaptive Dispersion. But distinctiveness constraints are formulated as constraints on the surface forms of possible words that interact with other phonological constraints, so they evaluate the distinctiveness of contrasts in context. As a result, Dispersion Theory predicts that contrasts can be neutralized or enhanced in particular phonological contexts. This prediction arises because the phonetic realization of sounds depends on their context, so the perceptual differences between contrasting sounds also depend on context. If the realization of a contrast in a particular context would be insufficiently distinct (i.e., it would violate a high-ranked distinctiveness constraint), there are two options: the offending contrast can be neutralized, or it can be modified (‘enhanced’) to make it more distinct.
A basic open question regarding Dispersion Theory concerns the proper formulation of distinctiveness constraints and the extent of variation in their rankings across languages, issues that are tied up with the questions about the nature of perceptual distinctiveness. Another concerns the size and nature of the comparison set of contrasting word-forms required to be able to evaluate whether a candidate output satisfies distinctiveness constraints.
Displacement is a ubiquitous phenomenon in natural languages. Grammarians often speak of displacement in cases where the rules for the canonical word order of a language lead to the expectation of finding a word or phrase in a particular position in the sentence whereas it surfaces instead in a different position and the canonical position remains empty: ‘Which book did you buy?’ is an example of displacement because the noun phrase ‘which book’, which acts as the grammatical object in the question, does not occur in the canonical object position, which in English is after the verb. Instead, it surfaces at the beginning of the sentence and the object position remains empty. Displacement is often used as a diagnostic for constituent structure because it affects only (but not all) constituents. In the clear cases, displaced constituents show properties associated with two distinct linear and hierarchical positions. Typically, one of these two positions c-commands the other and the displaced element is pronounced in the c-commanding position. Displacement also shows strong interactions with the path between the empty canonical position and the position where the element is pronounced: one often encounters morphological changes along this path and evidence for structural placement of the displaced constituent, as well as constraints on displacement induced by the path.
The exact scope of displacement as an analytically unified phenomenon varies from theory to theory. If more then one type of syntactic displacement is recognized, the question of the interaction between movement types arises. Displacement phenomena are extensively studied by syntacticians. Their enduring interest derives from the fact that the complex interactions between displacement and other aspects of syntax offer a powerful probe into the inner workings and architecture of the human syntactic faculty.