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It has been shown that visual cues play a crucial role in the perception of vowels and consonants. Conflicting consonantal stimuli presented in the visual and auditory modalities can even result in the emergence of a third perceptual unit (McGurk effect). From a developmental point of view, several studies report that newborns can associate the image of a face uttering a given vowel to the auditory signal corresponding to this vowel; visual cues are thus used by the newborns. Despite the large number of studies carried out with adult speakers and newborns, very little work has been conducted with preschool-aged children. This contribution is aimed at describing the use of auditory and visual cues by 4 and 5-year-old French Canadian speakers, compared to adult speakers, in the identification of voiced consonants. Audiovisual recordings of a French Canadian speaker uttering the sequences [aba], [ada], [aga], [ava], [ibi], [idi], [igi], [ivi] have been carried out. The acoustic and visual signals have been extracted and analysed so that conflicting and non-conflicting stimuli, between the two modalities, were obtained. The resulting stimuli were presented as a perceptual test to eight 4 and 5-year-old French Canadian speakers and ten adults in three conditions: visual-only, auditory-only, and audiovisual. Results show that, even though the visual cues have a significant effect on the identification of the stimuli for adults and children, children are less sensitive to visual cues in the audiovisual condition. Such results shed light on the role of multimodal perception in the emergence and the refinement of the phonological system in children.
This paper presents results of corpus analytic investigations of children's use of referring expressions and considers possible implications of this work for questions relating to development of theory of mind. The study confirms previous findings that children use the full range of referring forms (definite and indefinite articles, demonstrative determiners, and demonstrative and personal pronouns) appropriately by age 3 or earlier. It also provides support for two distinct stages in mind-reading ability. The first, which is implicit and non-propositional, includes the ability to assess cognitive statuses such as familiarity and focus of attention in relation to the intended referent; the second, which is propositional and more conscious, includes the ability to assess epistemic states such as knowledge and belief. Distinguishing these two stages supports attempts to reconcile seemingly inconsistent results concerning the age at which children develop theory of mind. It also makes it possible to explain why children learn to use forms correctly be-fore they exhibit the pragmatic ability to consider and calculate quantity implicatures.
The paper presents results from a combined production and comprehension study addressing some of the factors which guide the establishment of intersentential pronominal reference in child and adult Bulgarian. We investigate the time course and different stages in the acquisition of null, personal and demonstrative pro-nouns and their specific anaphoric functions. We target possible age-induced changes in the salience hierarchy of referent features such as animacy and grammatical role. Following the general consent in the field of anaphora research, we assume a division of labour between different pronominal forms with respect to the salience of their referents. Based on the data of Bulgarian preschool children we investigate the validity of this form-function relation, its language-specific shape and its developmentally induced variation. The results reveal an initial prominence of animate referents which later on develops into preference for animate subjects. Although the investigated 3 to 5 year old Bulgarian children do not stick to the adult anaphora resolution strategy, they comply with the principle of the reversed mapping within the range of tested pronouns and react according to their salience criteria which promote animate subjects as the most prominent co-reference candidates.
In anaphora resolution theory, it has been assumed that anaphora resolution is based on a reversed mapping of antecedent salience and anaphora complexity: minimal complex anaphora refer to maximal salient antecedents. In order to ex-amine whether and by which developmental steps German children gain command of this mapping maxim we conducted an experiment on production and comprehension of intersentential pronouns including the three pronoun types zero, personal, and demonstrative pronoun. With respect to antecedent salience, the experiment varied syntactic role (subject/object) and in/animacy. Six age groups of children (age range from 2;0 to 6;0) and an adult control group has been tested. The hypothesis arising from the mapping maxim is that zero pronoun correlates with more salient antecedents than personal and demonstrative pronoun, the latter correlating with the least salient antecedents. The results are: In production, children first establish the opposition of zero pronoun with animate antecedents vs. demonstrative pronoun with inanimate antecedents. In a next step, syntactic role comes into play and a more complex system opposing the three presented pronoun types is established. In comprehension, however, the effect of pronoun type re-mains weak and antecedent features remain a strong factor in reference choice. However, also adults employ pronoun type and antecedent features. The oldest children and the adults show variation in personal pronoun resolution according to the animacy pattern of the potential antecedents. In case of identical animacy features, the subject is the preferred candidate; in case of distinct animacy features, there is a tendency to choose the object antecedent.
Der Beitrag referiert Ergebnisse eines mit Erwachsenen durchgeführten Experiments zum Verständnis des bestimmten Artikels. Das Testmaterial entstammt einem für Kinder konzipierten Blickpräferenzexperiment. Die Durchführung des Tests mit Erwachsenen diente als Kontrolle der Verwendbarkeit der Materialien und der Überprüfung folgender Hypothese: Die referentielle Grundfunktion des Artikels besteht im Verweis auf begrenzte Ganze bzw. einen bestimmten (=begrenzten) Umfang einer Entität. Der interessante Aspekt des Experiments war, dass die Entscheidung zwischen [+begrenzt] vs. [-begrenzt] innerhalb einer pluralischen Kondition fallen musste, die Begrenztheitslesart wurde also nicht durch einzahlig auftretende zählbare Objekte erzeugt. Die Ergebnisse zeigen, dass die pluralische Kondition sich auf das Antwortverhalten der Probanden auswirkte. Probanden mit durchschnittlich längerer Reaktionszeit entscheiden sich anders als Probanden mit vergleichsweise kurzer Reaktionszeit. Während von der Gruppe mit spontanerem Entscheidungsverhalten die Hypothese im Hinblick auf den Artikel bestätigt wurde, scheint sich die Gruppe mit höheren Reaktionszeiten für das prototypischere Bild innerhalb der Pluralkondition zu entscheiden.
The study examines the hypotheses that the acquisition of the finite verb is an indispensable and linking constituent of the development of SVO utterances. Four apparently separate or at least separable processes are analysed over 6 months in one Russian and one German child: a) the emergence of verbs in the child’s utterances, b) the occurrence of correctly inflected (finite) verb forms, c) the development of multi-component utterances containing a verb, and c) the emergence of (potential) subjects and objects. Russian and German exhibit rich verb morphology, and in both languages finiteness is strongly correlated with inflectional categories like person, number and tense. With both children we find a correlation in the temporal order of these four processes and – what is more relevant for our study – a dependency of a certain development on the utterance level on the emergence of finite verbs. Further, our investigation shows that language-specific development comes in to play already when children start to acquire verb inflection and becomes more contrastive when we observe the onset of the production of the SVO utterances.
This paper deals with the emergence of verb morphology in one German child up to the time mini-paradigms occur in the data. I will focus on the role of protomorphology as a transitional stage between rote learning and the productive use of morphological distinctions.
In the following, we will discuss the acquisition of plural forms in German from the unified perspective of the two, in our opinion compatible, approaches, on the basis of a longitudinal data sample of eight children. There are at least six recordings of each child, all of whom are girls. Together, the data cover the acquisition period from 1;11 to 2;10. One may thus anticipate that the data sample under investigation reflects the transition from purely lexical memorization to the acquisition of regularities or patterns.
In these conclusions we can deal only with some of the tentative comparative results of the workshop papers on the early development of verb morphology. The main focus is on criteria of how the child detects morphology and how this emerging morphological competence develops in its earliest phases. In view of the purpose and tentative character of these conclusions, all references will be limited to the papers of the workshop and to earlier studies by workshop participants within the "Crosslinguistic Project on Pre- and Protomorphology in Language Acquisition". Much more will be given in the projected final publication.
Introduction
(2000)
In this paper the first results concerning the development of early verb morphology in an L1-English speaking child are presented. Adopting the framework of morphological development of Dressler (Dressler, this volume) the data of a girl from the CHILDES database, Nina of the Suppes corpus, is analysed with regard to the emergence of early verbal categories (e.g. number and person) and their appearance in a first mini-paradigm. In the sessions analysed so far the child Nina has reached an age of 2;2 when the first mini-paradigm emerges.
This paper deals with early verb development (e.g., person, tense) until the emergence of verb-paradigms in two French-speaking children.
I will show the parallelism between the two children in the gradual building of paradigms, despite considerable differences in the rate of development. Individual differences on the other hand will bring me to reconsider the broad category of premorphological rote-learnt forms which already displays some patterning in one of the children's data.
This paper studies the acquisition process of Spanish verbal morphology in a monolingual child. The study focuses on the period of the first 50 verb lemmas. This covers the period from age 1;7 till 1;10.
The data shows that the verb acquisition process of this Spanish child follows three main stages:
1. A lexical stage in which verbs are only acquired as a lexical element.
2. A syntactic stage in which the verb, still contemplated as a non-split word, becomes the main element in the development of thematic and semantic relations.
3. A morphological stage in which verb suffixes begin to be analysed separately. At this stage, the relationship between form and meaning starts and the functional categories linked to the verb (tense, aspect, agreement, mood... ) begin to be acquired. Just at this moment, the first miniparadigms appear, which suggests that the acquisition process of verb morphology has started.
The first two stages are premorphological and cover in our child the period till 1;9. In the last stage, which begins at 1;10, the child enters the protomorphological stage.
The source of the data used in this paper are recordings of conversations with a Lithuanian girl, Rūta. Rūta lives in Vilnius and is the only child in the family. Both parents speak standard Lithuanian without dialectal influences. The recordings were taken on a free basis without a fixed schedule, then transcribed by the mother of the child, double-checked and coded in accordance with CHILDES by the author of the paper. At the moment of writing this contribution the data taken between 1;7-2;5 have been fully processed. Over this period about 34.5 hours of recordings were collected.
While the perilinguistic child is endowed with predispositions for the categorical perception of phonetic features, their adaptation to the native language results from a long evolution from the end of the first year of age up to the adolescence. This evolution entails both a better discrimination between phonological categories, a concomitant reduction of the discrimination between within-category variants, and a higher precision of perceptual boundaries between categories. The first objective of the present study was to assess the relative importance of these modifications by comparing the perceptual performances of a group of 11 children, aged from 8 to 11 years, with those of their mothers. Our second objective was to explore the functional implications of categorical perception by comparing the performances of a group of 8 deaf children, equipped with a cochlear implant, with normal-hearing chronological age controls. The results showed that the categorical boundary was slightly more precise and that categorical perception was consistently larger in adults vs. normal-hearing children. Those among the deaf children who were able to discriminate minimal distinctions between syllables displayed categorical perception performances equivalent to those of normal-hearing controls. In conclusion, the late effect of age on the categorical perception of speech seems to be anchored in a fairly mature phonological system, as evidenced the fairly high precision of categorical boundaries in pre-adolescents. These late developments have functional implications for speech perception in difficult conditions as suggested by the relationship between categorical perception and speech intelligibility in cochlear implant children.
The goal of our current project is to build a system that can learn to imitate a version of a spoken utterance using an articulatory speech synthesiser. The approach is informed and inspired by knowledge of early infant speech development. Thus we expect our system to reproduce and exploit the utility of infant behaviours such as listening, vocal play, babbling and word imitation. We expect our system to develop a relationship between the sound-making capabilities of its vocal tract and the phonetic/phonological structure of imitated utterances. At the heart of our approach is the learning of an inverse model that relates acoustic and motor representations of speech. The acoustic to auditory mappings uses an auditory filter bank and a self-organizing phase of learning. The inverse model from auditory to vocal tract control parameters is estimated using a babbling phase, in which the vocal tract is essentially driven in a random manner, much like the babbling phase of speech acquisition in infants. The complete system can be used to imitate simple utterances through a direct mapping from sound to control parameters. Our initial results show that this procedure works well for sounds generated by its own voice. Further work is needed to build a phonological control level and achieve better performance with real speech.