Clitic pronouns are linguistic elements which stand at the crossroads between different areas of the language faculty. They have specific morphology, syntax, and discourse functions. Use of this element requires the management of several aspects that draw from these areas of language. Clitics have been shown to appear early in typical acquisition, but to require longer for all aspects to be correctly managed, and they proved effortful in other modes of acquisition and atypical language, where they are clinical markers of impairment. In this work, we implement a comprehensive assessment of clitics aiming to investigate in what way different occurrences of this structure highlight different patterns of linguistic performance. To do so, we focus both on accuracy across conditions and on answer strategies, with an experimental protocol testing the following: comprehension of reference in binding constructions, production of clitics in two argument positions (direct object and indirect object), production of clitics in two sentence positions (preverbal and postverbal), production of clitics with different person features (1st/2nd and 3rd), and pragmatic abilities in the alternation with the lexical noun phrase and in perspective shift contexts. The assessment was tested on the following groups of native speakers of Italian: a group of pre-school and primary school typically developing children (Study 1), a group of adult heritage speakers of Italian living in the UK (Study 2), and four (pre)adolescents with a diagnosis of ASD (Study 3). Results found in this work showed that a comprehensive assessment of clitics can highlight similarities as well as differences in linguistic profiles according to different groups. Specifically, comprehension was not a discriminating factor in the populations: all populations tested showed to have access to abstract representations of clitics in binding constructions, as comprehension of simple clitics was generally unproblematic. An exception was found in the pre-schoolers, but this may have been due to task-related factors. In line with previous results on typical, atypical, and bilingual populations, production of Italian 3rd person direct object clitics with finite verbs showed different patterns across populations: in our data, typical children of all ages and ASD pre-adolescents showed to correctly produce this instance of the clitic the majority of the time, while heritage speakers of Italian showed poor production rates on this instance of the clitic. Importantly, our data shows similar results for indirect objects, showing that if the cliticization process is accessible, it is accessible regardless of the argument position occupied by the cliticised object. Another crucial result is that our studies find different patterns to be highlighted by the production of clitics on non-finite verbs as opposed to those on finite verbs: accuracy is similarly high in one high-performing ASD pre-adolescent and in the group results of 8-year-old children, but 4-year-old and 6-year-old children, as well as some ASD participants show chance or below chance performance in enclisis. The same was true for production of clitic combinations, although it was the least accurate structure across all groups, particularly in non-finite constructions. Here, heritage speakers and a few ASD speakers produce little to no instances of this construction, while those who produce it the most are the highest performing ASD participant and the oldest group of children. It is plausible to assume that the derivation of both enclitics and clitic combinations may require harder computation. These results allow us to conclude that if an individual or a population has issues on single DO and IO clitics with finite verbs, they will have issues with all other instances in the assessment. If an individual or a population shows no issues on single DO and IO clitics with finite verbs, they show typical language. In this, single clitics are coherent to their role of clinical markers. However, this study highlights the power of other instances of clitics, namely enclitics and clitic combinations, to unearth vulnerabilities to complex language. Types of non-target response also showed to be in part characterizing of different populations. The most striking result in this sense is the production of a lexical NP in place of the clitic. In typical development, this answer type only becomes the most used alternative answer in the hardest constructions, namely in enclisis; on the other hand, heritage speakers systematically use this construction as the alternative to clitics and use it more than they use clitics across all conditions. In our results, errors that are usually associated with impairment, particularly in younger participants, were marginally present in all groups. These are errors on the φ-features of the clitics, omissions, and misplacements (of which we found no instances), and they were limited to the youngest TD group, the heritage speakers, and the lowest-performing ASD participant. A recurrent alternative structure employed in conditions eliciting enclitics was the production of a simplified, finite verb structure.

The aim of this thesis deals with the investigation of the cognitive mechanisms underlying the online processing of adverb-verb temporal agreement, namely the coherence in temporal features between the verb and a deictic temporal adverb (e.g. YesterdayPAST I wentPAST/*will goFUT to the jazz concert), during sentence comprehension. There are at least two reasons that make the investigation of this phenomenon interesting and challenging at the same time. The first reason is more theoretical. Differently from well-studied phenomena such as subject-verb agreement or anaphora, the nature of the adverb-verb relation is still debated in theoretical linguistics. The debated nature of the adverb-verb temporal agreement probably relies on the peculiar properties of the constituents involved in the relation. The relation between temporal adverbs and verbs has been traditionally defined anaphoric in nature, since verbs can be bound to temporal antecedents (e.g. adverb) which allow to set a reference time that the event expressed by the verb must refer to. However, other accounts have hypothesized a structural parallelism between the adverb-verb and the subject-verb relation. One question is thus whether this similarities or dissimilarities between subject-verb agreement and temporal agreement at the theoretical level can mirror a similarity/dissimilarity at the cognitive level. The second reason is more empirical and comes from past experimental literature investigating the processing of temporal agreement. Basically, experimental evidence mainly comes from ERPs studies and results are rather sparse and heterogeneous. These ERP studies report an early detection of the temporal violation (around 200 milliseconds after the stimulus onset) but qualitatively different ERP waveforms were elicited by the target word (i.e. the verb) in the different experiments (e.g. LAN, N400, right lateralized negativities). One licit question is thus where the source of heterogeneity resides and how this phenomenon can be better investigated. Given the debated theoretical and experimental past evidence on the processing of this relation, the current work was conducted (i) investigating the pattern elicited by adverb-verb temporal violations compared to other better-studied agreement phenomena, as the one between the subject and the verb, during sentence comprehension (ii) adopting only behavioral techniques since a detailed investigation of the behavioral costs elicited by a temporal violation needs to be established prior to facing the detailed neurophysiological correlates of these processes, which are known to be subject to a larger interpretive freedom with respect to reading time differences. The core of the thesis, namely six empirical studies investigating the processing of temporal violations through different designs and techniques, is preceded by a theoretical chapter which deals with the description of Tense and deictic temporal adverbs from a semantic and syntactic point of view. The main aim of the theoretical chapter is to give a brief overview of the main linguistic theories which have investigated the nature of Tense and temporal adverbs, but also a motivation for considering the syntactic interaction between Tense and temporal adverbs, which is fundamental to preserve the grammaticality of the sentence.The first set of self-paced reading studies, in Italian, addressed two main questions: how different is the processing of adverb-verb temporal agreement with respect to other better-studied phenomena such as subject-verb number agreement? Is the different configuration between the verb and the temporal adverb that has led to heterogeneous results in past experimental literature? In the second (eye-tracking) study, in Spanish, three other questions were addressed: how differently the parser deals with the processing of number, tense and (crucially) person features when encountering a violation on the inflected verb? Does the distance between the two constituents of the dependency play any role in the detection of the violation? Finally, in the third set of eye-tracking studies in English, the processing of the adverb-verb temporal relation was tested in a more complex sentential environment, namely in sentence where the temporal adverb and the verb are separated by an embedded relative clause containing a distracting temporal element. In this set of studies, several questions were addressed: how different can be the processing of adverb-verb temporal agreement at a conspicuous distance? Is the temporal adverb-verb relation sensitive to interference effects from an illicit intervener? How differently this relation behaves with respect to subject-verb agreement and anaphora during memory retrieval? All findings collected in this work provide further evidence for a differentiation in the processing of agreement mechanisms entailing a covariance of features between two constituents within a sentence. This evidence is in line with previous accounts showing a differentiation in the processing of different features (i.e. number, person) within the same relation such as subject-verb agreement (Mancini et al. 2013), and in the processing of the same feature (e.g. number) across different relations such as subject-verb agreement and anaphora (Dillon et al. 2013). This evidence can be particularly relevant for the development of a new model of sentence parsing. In fact, among mainstream models of parsing, only Construal (Frazier & Clifton, 1996) model assumes a relation-sensitive language system. However, a differentiation in the processing of agreement phenomena is not explicitly addressed in terms of feature-related properties. On the other hand, some recent accounts have proposed different processing mechanisms depending on the feature under computation (e.g. Mancini et al., 2013; Carminati, 2005) but a specific formalization of the role of different features properties within a model of parsing has not been provided yet. The second challenge that this current work tried to face was to add more complexity into the agreement configuration testing the adverb-verb agreement relation at different linear distance. The findings here collected seems to give positive evidence on the role played by word order in the processing of the adverb-verb relation, but further investigation needs to address whether other factors may play a role and whether adverb-verb agreement is the only agreement relation which is sensitive to word order. This puzzle thus opens new questions about whether the agreement relation may change even being both the relation and the feature under computation equal. The role played by linear distance in the detection of adverb-verb temporal anomalies also suggests that parsing routines are not “stagnant†, and the language system can deal with redundant information in a very dynamic fashion.

This thesis' aim is to add some pieces to the complex puzzle on the mechanism behind the comprehension of conversational implicatures. To do so, in a series of experiment we manipulated both the type of implicatures (scalar vs. ad-hoc) and the population under investigation (typical vs. atypical; children vs. adults).

Effective methods for evaluating the reliability of statements issued by witnesses and defendants in hearings would be extremely valuable to decision-making in Court and other legal settings. In recent years, methods relying on stylometric techniques have proven most successful for this task; but few such methods have been tested with language collected in real-life situations of high-stakes deception, and therefore their usefulness outside laboratory conditions still has to be properly assessed. DeCour - DEception in COURt corpus - has been built with the aim of training models suitable to discriminate, from a stylometric point of view, between sincere and deceptive statements. DeCour is a collection of hearings held in four Italian Courts, in which the speakers lie in front of the judge. These hearings become the object of a specific criminal proceeding for calumny or false testimony, in which the deceptiveness of the statements of the defendant is ascertained. Thanks to the final Court judgment, that points out which lies are told, each utterance of the corpus has been annotated as true, uncertain or false, according to its degree of truthfulness. Since the judgment of deceptiveness follows a judicial inquiry, the annotation has been realized with a greater degree of confidence than ever before. In Italy this is the first corpus of deceptive texts not relying on ‘mock’ lies created in laboratory conditions, but which has been collected in a natural environment. In this dissertation we replicated the methods used in previous studies but never before applied to high-stakes data, and tested new methods. Among the best known proposals in this direction are methods proposed by Pennebaker and colleagues, who employed their lexicon - the Linguistic Inquiry and Word Count (liwc) - to analyze different texts or transcriptions of spoken language, in which deception could have been used, but collected in an artificial way. In our experiments, we trained machine learning models relying both on lexical features belonging to liwc and on surface features. The surface features were selected calculating their Information Gain, or simply according to the frequency they appear in the texts. We also considered the effect of a number of variables including the degree of certainty the utterances were annotated as truthful or not and the homogeneity of the dataset. In particular, the classification task of false utterances was carried out against the only utterances annotated as true, or against the utterances annotated as true and as uncertain together. Moreover subsets of DeCour were analysed, in which the statements were issued by homogeneous categories of subject, e.g. speakers of the same gender, age or native language. Our results suggest that accuracy at deception detection clearly above chance level can be obtained with real-life data as well.

The philosopher H. P. Grice was the first to highlight the extent to which our ability to communicate effectively depends on speakers acting cooperatively. This tendency to cooperation in language use, recognized since Grice’s William James lectures, has been a key tenet of subsequent theorizing in pragmatics. Yet it’s also clear that there are limits to the extent to which people cooperate: theoretical and empirical studies of the Prisoner’s Dilemma have shown that people prefer to cooperate if the other party cooperates, but not otherwise. This would suggest that in language use, as well, the level of cooperation depends on the other person’s cooperativeness. So far, however, it has proven remarkably difficult to test such prediction, because it is difficult to analyze cooperation and communicative style objectively, and the schemes proposed so far for, e.g., non-verbal cues to cooperation tend to have low reliability. In this study the existence of a negative correlation between emotions and linguistic cooperation is demonstrated for the first time, thanks to newly developed methods for analyzing cooperation and facial expressions. The heart rate and facial expressions of the participants in a cooperative task were recorded after uses of cooperative and uncooperative language; facial expressions and the level of linguistic cooperation in each utterance were classified with high reliability. As predicted, very high negative correlations were observed between heart rate and cooperation, and the facial expressions were found to be highly predictive of her level of cooperation. Our results shed light on a crucial aspect of communication, and our methods may be usable to research in other aspects of human interaction as well.

Defining the meaning of vague quantifiers (‘few’, ‘most’, ‘all’) has been, and still is, the Holy Grail of a mare magnum of studies in philosophy, logic, and linguistics. The way by which they are learned by children has been largely investigated in the realm of language acquisition, and the mechanisms underlying their comprehension and processing have received attention from experimental pragmatics, cognitive psychology, and neuroscience. Very often their meaning has been tied to that of numbers, amounts, and proportions, and many attempts have been made to place them on ordered scales. In this thesis, I study quantifiers from a novel, cognitively-inspired computational perspective. By carrying out several behavioral studies with human speakers, I seek to answer several questions concerning their meaning and use: Is the choice of quantifiers modulated by the linguistic context? Do quantifiers lie on a mental, semantically-ordered scale? Which are the features of such a scale? By exploiting recent advances in computational linguistics and computer vision, I test the performance of state-of-art neural networks in performing the same tasks and propose novel architectures to model speakers’ use of quantifiers in grounded contexts. In particular, I ask the following questions: Can the meaning of quantifiers be learned from visual scenes? How does this mechanism compare with that subtending comparatives, numbers, and proportions? The contribution of this work is two-fold: On the cognitive level, it sheds new light on various issues concerning the meaning and use of such expressions, and provides experimental evidence supporting the validity of the foundational theories. On the computational level, it proposes a novel, theoretically-informed approach to the modeling of vague and context-dependent expressions from both linguistic and visual data. By carefully analyzing the performance and errors of the models, I show the effectiveness of neural networks in performing challenging, high-level tasks. At the same time, I highlight commonalities and differences with human behavior.

In this thesis, I study the differences in form and interpretation presented by event-denoting nominalizations. Frequently, languages have more than one type of event nominalization, such as deverbal nouns derived by means of suffixes (Italian mutamento / mutazione, ‘change’, ‘mutation’, or English assignment, explosion) and their corresponding verbal nouns, e.g. infinitives (il mutare, ‘the changing’) or gerunds (exploding). These are usually perceived as alternatives, since their semantic difference is not clearly understood by neither native speakers nor linguists. The aim of this work is to understand the rationale that leads us to choose one form instead of the other and to define the linguistic features involved. The hypothesis underlying the whole thesis is that different forms are never true synonyms and, thus, present some differences in use, distribution or meaning. In a first study, I explore the role of the base verb in the nominalization selection. I investigate if the various nominalizations are formed from different types of base verbs and which characteristics define their domain of application. By means of statistical modeling, I highlight how the transitivity of the base verb partially determines which nominalization is preferred. Moreover, I show that NIs are not used to make up for the lack of a corresponding EDN, refuting previous claims. Then, I move forward analyzing the cases in which both forms are derived from the same base and I try to understand if they differ in meaning. In the second study presented, I use collocation analysis to observe their semantic dissimilarities. With focus on a single syntactic pattern, I find out that nominal infinitives and deverbal nouns inherit only part of the base verb senses. The former usually prefer metaphorical and abstract senses, whereas the latter select more concrete and literal ones. Lastly, I use distributional semantic models to observe quantitatively the semantic shift of the two processes. I confirm the hypothesis that nominal infinitives are more transparent and more semantically regular than deverbal nouns, given their inflectional nature. The studies presented have been conducted on Italian and German; however, the findings are relevant for the general treatment of nominalizations and may be replicated for further languages. Overall, my work shows how quantitative analyses of corpus data can help us investigate problems that are hardly addressed by linguists introspection. Moreover, it includes in the study of nominalizations nominal infinitives, non-finite verbal forms which, contrary to English gerunds, have not received the attention they deserve.

Il campo di studi sull’apprendimento della terza lingua (L3) e sull’influenza interlinguistica è piuttosto recente nel panorama degli studi riguardanti l’acquisizione linguistica e ancora più recente è il focus sull’ambiente plurilingue e sui parlanti plurilingui. Il presente lavoro è stato sviluppato a partire da una ricerca condotta nel 2012 nella scuola primaria di Fierozzo e nelle scuole primarie della valle del Fèrsina e si propone di inserire lo studio sul plurilinguismo mòcheno all’interno del campo di studi della L3 proseguendo la ricerca nella fascia di età 11-14 anni, allo scopo di approfondire tre principali aspetti: l'aspetto sociolinguistico, l'aspetto cognitivo - acquisizionale e l'aspetto educativo.

This doctoral thesis explores the question of how much people’s ability to reflect on another person’s intentions and perspectives contributes to their success in understanding language, and further how children acquire these communication skills during development. This aim is achieved by focusing on a specific linguistic phenomenon, scalar implicatures, by which listeners enrich the meaning of a given utterance to implicate more than what is explicitly said. Such implicatures arise when a speaker uses a less informative term, such as “some”, when a more informative term like “all” is also available, thus leading the listener to the conclusion that the more informative alternative must be false. For instance, if a speaker says that some of her friends are curly, the listener will enrich the statement and assume that not all of them are. The first part of the thesis is focused on scalar implicature derivation during adulthood, to delineate the role of understanding communicative intention and reasoning about people’s epistemic state in the derivation process. The second part of the thesis investigates theoretical and methodological aspects of the acquisition of scalar implicatures, both through reviews of the literature and experimental studies investigating the role of inhibitory control, intention-reading and perspective-taking in implicature derivation between the ages of 2 and 17.

Traditionally, language contact studies have dealt with grammatical interference between two languages. Clearly, the case of Cimbrian is unique in that its linguistic system results from contact with two different languages: German, which belongs to the same family that Cimbrian is commonly considered to belong to (Germanic) and Italian, which belongs to a different language family (Romance). For this reason, this dissertation has two main aims: First and foremost, it aims to provide the first theoretical account for three relevant morpho-syntactic features of Cimbrian: adjectival ordering, participial forms, and auxiliary selection. These three case studies were purposefully chosen as being representative of the impact the two source languages had on the receiving language. Second, by looking at the three aforementioned cases, it ultimately aims to lay ground- work for further research on theoretical approaches to language variation and innovation via language contact.