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We summarize findings from across a range of methods, including behavioral measures of overall processing speed and accuracy, electrophysiological indices that tap into the early time course of language processing, and neural measures using structural and functional imaging. We argue that traditional claims about rigid constraints on the ability of late bilinguals to exploit the meaning and form of the morphology and morphosyntax in a second language should be revised so as to move away from all or none command of structures motivated from strict dichotomies among linguistic categories of morphology. We describe how the dynamics of morphological processing in neither monolingual or bilingual speakers is easily characterized in terms of the potential to decompose words into their constituent morphemes and that morphosyntactic processing is not easily characterized in terms of categories of structures that are learnable and those that are unlearnable by bilingual and nonnative speakers. Instead, we emphasize the high degree of variability across individuals and plasticity within individuals in their ability to successfully learn and use even subtle aspects of a second language. Further, both of the bilingual’s two languages become active when even one language is engaged, and parallel activation has consequences that shape both languages, thus their influence is not in the unidirectional manner that was traditionally assumed. We briefly discuss the nature of possible constraints and directions for future research.

Distributed Morphology (DM) is a framework in theoretical morphology, characterized by two core tenets: (i) that the internal hierarchical structure of words is, in the first instance, syntactic (complex words are derived syntactically), and (ii) that the syntax operates on abstract morphemes, defined in terms of morphosyntactic features, and that the spell-out (realization, exponence) of these abstract morphemes occurs after the syntax. Distributing the functions of the classical morpheme in this way allows for analysis of mismatches between the minimal units of grammatical combination and the minimal units of sound. Much work within the framework is nevertheless guided by seeking to understand restrictions on such mismatches, balancing the need for the detailed description of complex morphological data in individual languages against an attempt to explain broad patterns in terms of restrictions imposed by grammatical principles.

Research in neurolinguistics examines how language is organized and processed in the human brain. The findings from neurolinguistic studies on language can inform our understanding of the basic ingredients of language and the operations they undergo. In the domain of the lexicon, a major debate concerns whether and to what extent the morpheme serves as a basic unit of linguistic representation, and in turn whether and under what circumstances the processing of morphologically complex words involves operations that identify, activate, and combine morpheme-level representations during lexical processing. Alternative models positing some role for morphemes argue that complex words are processed via morphological decomposition and composition in the general case (full-decomposition models), or only under certain circumstances (dual-route models), while other models do not posit a role for morphemes (non-morphological models), instead arguing that complex words are related to their constituents not via morphological identity, but either via associations among whole-word representations or via similarity in formal and/or semantic features. Two main approaches to investigating the role of morphemes from a neurolinguistic perspective are neuropsychology, in which complex word processing is typically investigated in cases of brain insult or neurodegenerative disease, and brain imaging, which makes it possible to examine the temporal dynamics and neuroanatomy of complex word processing as it occurs in the brain. Neurolinguistic studies on morphology have examined whether the processing of complex words involves brain mechanisms that rapidly segment the input into potential morpheme constituents, how and under what circumstances morpheme representations are accessed from the lexicon, and how morphemes are combined to form complex morphosyntactic and morpho-semantic representations. Findings from this literature broadly converge in suggesting a role for morphemes in complex word processing, although questions remain regarding the precise time course by which morphemes are activated, the extent to which morpheme access is constrained by semantic or form properties, as well as regarding the brain mechanisms by which morphemes are ultimately combined into complex representations.

The Word and Paradigm approach to morphology associates lexemes with tables of surface forms for different morphosyntactic property sets. Researchers express their realizational theories, which show how to derive these surface forms, using formalisms such as Network Morphology and Paradigm Function Morphology. The tables of surface forms also lend themselves to a study of the implicative theories, which infer the realizations in some cells of the inflectional system from the realizations of other cells. There is an art to building realizational theories. First, the theories should be correct, that is, they should generate the right surface forms. Second, they should be elegant, which is much harder to capture, but includes the desiderata of simplicity and expressiveness. Without software to test a realizational theory, it is easy to sacrifice correctness for elegance. Therefore, software that takes a realizational theory and generates surface forms is an essential part of any theorist’s toolbox. Discovering implicative rules that connect the cells in an inflectional system is often quite difficult. Some rules are immediately apparent, but others can be subtle. Software that automatically analyzes an entire table of surface forms for many lexemes can help automate the discovery process. Researchers can use Web-based computerized tools to test their realizational theories and to discover implicative rules.

This contribution analyses morphologically autonomous structures within the context of the Romance languages, the family of languages which, along with Latin, have most served as an evidence base for these structures. Autonomous morphological structures are defined as an abstract representation of paradigmatic cells which form a cohesive group and reliably share exponents with each other, and the forms which realize them, are thus to a large extent interpredictable. In this contribution, I restrict my discussion to the most canonical type of these structures and those which have sparked the most controversy in the linguistic literature. I analyze this controversy and suggest that it is due to (a) their overlapping meaning with the term morphome, a concept which embodies an empirical claim about all morphology and (b) the controversy surrounding what morphology actually is and the basic units of morphological analysis and storage. I make a distinction between abstractive and constructive models of morphology and suggest that historical tendencies within the latter encourage scholars to view morphologically autonomous structures either as not synchronically relevant or as phonologically or semantically derivable due to their theoretical assumptions about the nature of language and the mental storage of words. These assumptions constitute the horizons of intelligibility of such models regarding the functioning of language and its governing principles, including outdated ideas of the capacity of mental storage. Unfortunately, however, the different theories furnish scholars with an expansive array of devices through which they can seemingly explain away the synchronic generalizations of the data while relegating the most recalcitrant data to the domain of memorized forms which are not relevant to the grammar. I present evidence in favor of the psychological reality of morphologically autonomous structures in diachrony and I argue that synchronically, these structures are necessary to explain the distribution of the data and capture the fact that speakers do not memorize every inflectional form of a paradigm but rely on patterns of predictability and implicational relationships between forms. It is my suggestion that morphologically autonomous structures encourage a revaluation of the basic units of memorization and the structure of the lexicon in accordance with abstractive theories of morphology.

The Altaic languages (Turkic, Mongolic, Tungusic) are spread across Eurasia, from Central Asia to the Middle East and the Balkans. The genetic affinity between these subgroups has not been definitively established but the commonality among features and patterns points to some linguistic connections. The main morphological operations in Altaic languages are suffixation and compounding. Generally regarded as morphologically regular with easily identifiable suffixes in which there are clear form-meaning correspondences, the languages, nevertheless, show irregularities in many domains of the phonological exponents of morphosyntactic features, such as base modification, cumulative exponence, and syncretism. Nouns are inflected for number, person, and case. Case markers can express structural relations between noun phrases and other constituents, or they can act as adpositions. Only very few of the Altaic languages have adjectival inflection. Verbs are inflected for voice, negation, tense, aspect, modality, and, in most of the languages subject agreement, varying between one and five person-number paradigms. Subject agreement is expressed through first, second, and third persons singular and plural. In the expression of tense, aspect, and modality, Altaic languages employ predominantly suffixing and compound verb formations, which involve auxiliary verbs. Inflected finite verbs can stand on their own and form propositions, and as a result, information structure can be expressed within a polymorphic word through prosodic means. Affix order is mostly fixed and mismatches occur between morpholotactic constraints and syntactico-semantic requirements. Ellipsis can occur between coordinated words. Derivational morphology is productive and occurs between and within the major word classes of nominals and verbs. Semantic categories can block other semantic categories.

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.

Dene languages are often recognized for their morphological complexity. The languages are known in particular for their complex verbal morphology, and the Dene verb word has received considerable attention in the literature. The verb word is polysynthetic, with several unusual properties: the actual morpheme inventory is relatively small, with rich word formation possibilities; it is prefixing, while suffixing is far more common amongst the world’s languages; what is a single morpheme from a semantic perspective can be discontinuous, illustrating what Whorf calls interrupted synthesis; a single morpheme can be both semantically productive and lexically idiosyncratic; some affixes are mobile; there is considerable homophony; fusion of morphemes is common; and aspects of the phonology lead to surface opacity, with unexpected allomorphy. Several proposals have been introduced to account for the structure of the verb word, and psycholinguistic and sociolinguistic factors that enter in to understanding the complexities of the verb word have been addressed. There is also research on the acquisition of and teaching of the verb word. Overall, it is important to ask what the structure of the verb is synchronically, and what, while interesting, is a consequence of diachronic developments. In addition to the well-studied complexities of the verb, there are also interesting aspects of other categories. The nouns are worthy of attention for their formation, a noun classification system, and nominal possession. The directional systems of Dene languages tend to be rich, including both a root that indicates direction and a prefix that specifies distance or direction from the speaker. At least some of he languages also have evidentials, and these are, in general, understudied. Dene languages, like many other languages of North America, are now being learned largely as second languages. This increases the urgency to study areas such as acquisition and language use in order to help in sustaining the languages in communities where this is desired.

Subtraction consists in shortening the shape of the word. It operates on morphological bases such as roots, stems, and words in word-formation and inflection. Cognitively, subtraction is the opposite of affixation, since the latter adds meaning and form (an overt affix) to roots, stems, or words, while the former adds meaning through subtraction of form. As subtraction and affixation work at the same level of grammar (morphology), they sometimes compete for the expression of the same semantics in the same language, for example, the pattern ‘science—scientist’ in German has derivations such as Physik ‘physics’—Physik-er ‘physicist’ and Astronom-ie ‘astronomy’—Astronom ‘astronomer’. Subtraction can delete phonemes and morphemes. In case of phoneme deletion, it is usually the final phoneme of a morphological base that is deleted and sometimes that phoneme can coincide with a morpheme. Some analyses of subtraction(-like shortenings) rely not on morphological units (roots, stems, morphological words, affixes) but on the phonological word, which sometimes results in alternative definitions of subtraction. Additionally, syntax-based theories of morphology that do not recognize a morphological component of grammar and operate only with additive syntactic rules claim that subtraction actually consists in addition of defective phonological material that causes adjustments in phonology and leads to deletion of form on the surface. Other scholars postulate subtraction only if the deleted material does not coincide with an existing morpheme elsewhere in the language and if it does, they call the change backformation. There is also some controversy regarding what is a proper word-formation process and whether what is derived by subtraction is true word-formation or just marginal or extragrammatical morphology; that is, the question is whether shortenings such as hypocoristics and clippings should be treated on par with derivations such as, for example, the pattern of science-scientist. Finally, research in subtraction also faces terminology issues in the sense that in the literature different labels have been used to refer to subtraction(-like) formations: minus feature, minus formation, disfixation, subtractive morph, (subtractive) truncation, backformation, or just shortening.

Derivational word-formation processes play an important role in the Germanic languages. In particular, prefixation and suffixation are highly productive. In accordance with the so-called right-hand head principle, suffixes tend to determine the morphological category of a word, and are therefore often category-changing (e.g., verb to noun), while prefixes can lead to changes regarding the valency or case government of the items to which they attach. Derivational patterns differ in various aspects, including the degree to which they modify the semantics of their bases and their morphological productivity.

Corpora are an all-important resource in linguistics, as they constitute the primary source for large-scale examples of language usage. This has been even more evident in recent years, with the increasing availability of texts in digital format leading more and more corpus linguistics toward a “big data” approach. As a consequence, the quantitative methods adopted in the field are becoming more sophisticated and various. When it comes to morphology, corpora represent a primary source of evidence to describe morpheme usage, and in particular how often a particular morphological pattern is attested in a given language. There is hence a tight relation between corpus linguistics and the study of morphology and the lexicon. This relation, however, can be considered bi-directional. On the one hand, corpora are used as a source of evidence to develop metrics and train computational models of morphology: by means of corpus data it is possible to quantitatively characterize morphological notions such as productivity, and corpus data are fed to computational models to capture morphological phenomena at different levels of description. On the other hand, morphology has also been applied as an organization principle to corpora. Annotations of linguistic data often adopt morphological notions as guidelines. The resulting information, either obtained from human annotators or relying on automatic systems, makes corpora easier to analyze and more convenient to use in a number of applications.

Grammatical gender is a pervasive property of the Germanic languages. The typical Germanic gender system distinguishes three values: masculine, feminine, and neuter. The gender value of a noun is not expressed on the noun itself, but shows on agreeing words such as articles, adjectives, and a variety of pronouns. In all Germanic languages except for the two most conservative, Icelandic and Faroese, gender is distinguished only in the singular. Some of the languages have reduced the traditional three gender values to two. In most varieties, this involves the conflation of the historical masculine and feminine. In these languages, nouns denoting male or female persons appear with the same form of the article and other agreeing words. However, the personal pronouns often retain the masculine-feminine split. Some agreement targets have lost their ability to mark gender altogether. In the most extreme cases, gender agreement is limited to the personal and the possessive pronouns, such as in English and in Afrikaans. What gender a noun belongs to is regulated by assignment principles. Germanic shows semantic, morphological, and phonological assignment principles. In the more traditional languages, especially Icelandic, Faroese, and German, the inflectional class of a noun is an important predictor for its gender. The pronominal gender languages Afrikaans and English have purely semantic systems. This appears to be a typical correlation, observable in other languages. This article describes the gender systems of Germanic comparatively and points out interesting complexities that inform our understanding of this puzzling grammatical feature.

Liheci ‘separable words’ is a special phenomenon in Mandarin Chinese, and it refers to an intransitive verb with two or more syllables that allows the insertion of syntactic modifiers or an argument in between the first syllable and the second or the rest of syllables with the help of the nominal modifier marker de. There are two major groups of Liheci: those stored in the lexicon, such as bangmang ‘help’, lifa ‘haircut’, and shenqi ‘anger’, and those derived in syntax through noun-to-verb incorporation, such as chifan ‘eat meal’, leiqiang ‘build wall’, in which fan ‘meal’ and qiang ‘wall’ are incorporated into chi ‘eat’ and lei ‘build’, respectively, to function as temporary verbal compounds. The well-known behavior of Liheci is that it can be separated by nominal modifiers or a syntactic argument. For example, bangmang ‘help’ can be used to form a verb phrase bang Lisi-de mang ‘give Lisi a help’ by inserting Lisi and a nominal modifier marker, de, between bang and mang, with bang being understood as the predicate and Lisi-de mang as the object. Although Lisi appears as a possessor marked by de, it should be understood as the theme object of the compound verb. In similar ways, the syntactic–semantic elements such as agent, theme, adjectives, measure phrases, relative clauses, and the like can all be inserted between the two components of bangmang, deriving verb phrases like (Zhangsan) bang Zhangsan-de mang ‘(Zhangsan) do Zhangsan’s help’, where Zhangsan is the agent; bang-le yi-ci mang ‘help once’, where yi-ci is a measure phrase; and bang bieren bu xiang bang de mang ‘give a help that others don’t want to give’, where bieren bu xiang bang is a relative clause. The same insertions can be found in Liheci formed in syntax. For example, chi liang-ci fan ‘eat two time’s meal’ (eat meals twice), lei san-tian qiang ‘build three day’s wall’ (build walls for three days). There are three syntactic-semantic properties exhibited in verb phrases formed with Liheci: first, possessors being understood as Liheci’s logical argument; second, interdependent relation between the predicate and the complement; and, third, obligatory use of verbal classifiers instead of nominal classifiers. In this article, first, five influential analyses in the literature are reviewed, pointing out their strengths and weaknesses. Then, the cognate object approach is discussed. Under this approach, Lihecis are found to be intransitive verbs that are capable of taking nominalized reduplicates of themselves as their cognate objects. After a complementary deletion on the verb and its reduplicate object in the Phonetic Form (PF), all the relevant verb phrases can be well derived, with no true separation involved in the derivation, as all the copies of Liheci in question remain intact all along. After a discussion of the relevant syntactic structures, it is shown that with this syntactic capacity, all participants involved in the events can be successfully accommodated and correctly interpreted. The advantage can be manifested in six aspects, demonstrating that this proposal fares much better than other approaches.

The languages of the Austroasiatic (AA) language family share a core set of derivational prefixes and infixes that are largely fossilized. Beyond these, there is a wide range of morphological features throughout these more than 160 languages. Of the 13 branches of AA, there is a geographically central concentration of branches with predominantly isolating morphology (Khmeric, Monic, Vietic, and Pearic), while geographically peripheral branches have more complex morphology (Aslian and Khasic), and some with inflectional morphology (Munda and Nicobaric). Other branches are typologically between, largely lacking inflectional morphology (i.e., systematic, productive grammatical morphology) but having a somewhat more complex range of morphological features (Katuic, Bahnaric, Palaungic, Khmuic, and Mangic), including those with some grammatical functions. Other than Munda and Nicobaric, most AA languages have iambic word-level stress and have only prefixes and infixes while lacking suffixes. This has resulted in a collapsing of older morphological material, while new affixes, with new morphosemantic functions, emerge. Alternating reduplication, in which complete prosodic templates are copied but various segments are alternated, is a common word-formation strategy and sometimes combines with prefixes and affixes. While lexical compounds are common, so are pseudo-compounds with near affix-like semantic, and sometimes phonological, features. Overall, while monomorphemic words are common among the more isolating types of AA languages, ample linguistic descriptions show a substantially wider range of morphological complexity throughout the AA language family.

This chapter is an overview of the structure of words belonging to the major lexical categories (nouns and verbs) in Niger-Congo languages, with an emphasis on the morphological patterns typically found in the core Niger-Congo languages commonly considered as relatively conservative in their morphology: rich systems of verb morphology, both inflectional and derivational, and systems of gender-number marking with a relative high number of genders, and no possibility to isolate number marking from gender marking. As regards formal aspects of the structure of words, as a rule, verb forms are morphologically more complex than nominal forms. The highest degree of synthesis is found in the verbal morphology of some Bantu languages. Both prefixes and suffixes are found. Cumulative exponence is typically found in gender-number marking. Multiple exponence is very common in the verbal morphology of Bantu language but rather uncommon in the remainder of Niger-Congo. Consonant alternations are common in several groups of Niger-Congo languages, and various types of tonal alternations play an important role in the morphology of many Niger-Congo languages. The categories most commonly expressed in the inflectional morphology of nouns are gender, number, definiteness, and possession. The inflectional morphology of verbs commonly expresses agreement, TAM, and polarity, and is also widely used to express interclausal dependencies and information structure. As regards word formation, the situation is not uniform across the language groups included in Niger-Congo, but rich systems of verb-to-verb derivation are typically found in the Niger-Congo languages whose morphological patterns are commonly viewed as conservative.

Speech production is an important aspect of linguistic competence. An attempt to understand linguistic morphology without speech production would be incomplete. A central research question develops from this perspective: what is the role of morphology in speech production. Speech production researchers collect many different types of data and much of that data has informed how linguists and psycholinguists characterize the role of linguistic morphology in speech production. Models of speech production play an important role in the investigation of linguistic morphology. These models provide a framework, which allows researchers to explore the role of morphology in speech production. However, models of speech production generally focus on different aspects of the production process. These models are split between phonetic models (which attempt to understand how the brain creates motor commands for uttering and articulating speech) and psycholinguistic models (which attempt to understand the cognitive processes and representation of the production process). Models that merge these two model types, phonetic and psycholinguistic models, have the potential to allow researchers the possibility to make specific predictions about the effects of morphology on speech production. Many studies have explored models of speech production, but the investigation of the role of morphology and how morphological properties may be represented in merged speech production models is limited.

The Yam languages are a primary language family spoken in southern New Guinea across an area spanning around 180km west to east across both the Indonesian province of Papua and Papua New Guinea. The Yam languages are morphologically remarkable for their complex verbal inflection characterized by a tendency to distribute inflectional exponence across multiple sites on the verb. Under this pattern of distributed exponence, segmental formatives, that is, affixes, are identifiable but assigning any coherent semantics to these elements is often difficult and instead the inflectional meanings can only be determined once multiple formatives have been combined. Despite their complex inflectional morphology, Yam languages display comparatively impoverished word formation or derivational morphology. Nominal inflection is characterized by moderately large case inventories, the largest displaying 16 cases. Nouns are occasionally marked for number although this is typically restricted to certain case values. Verbal paradigms are much larger than nominal paradigms. Verbs mark agreement with up to two arguments in person, number, and natural gender. Verbs also mark complex tense, aspect, and mood values; in all languages this involves at least two aspect values, multiple past tense values, and some level of grammatical mood marking. Verbs may also be marked for diathesis, direction, and/or pluractionality. The overall morphological pattern is that of fusional or inflectional languages. Nominal inflection is rather straightforward with nominals taking case suffixes or clitics with little to no inflectional classes. The true complexity lies in the organization of the verbal inflectional system, about which, despite individual variation across the family, a number of architectural generalizations can be made. The family displays a fairly uniform verbal inflectional template and all languages make a distinction between prefixing and ambifixing verbs. Prefixing verbs show agreement via a prefix only while ambifixing verbs via agreement with a suffix, for monovalent clauses, or with both a prefix and a suffix for bivalent verbs. These agreement affixes are also involved in the distributed exponence of tense, aspect, and mood.