It has long been argued that prosodic cues may facilitate syntax acquisition (e.g., Morgan, 1986). Previous studies have shown that infants are sensitive to violations of typical correlations between clause-final prosodic cues (Hirsh-Pasek et al., 1987) and that prosody facilitates memory for strings of words (Soderstrom et al., 2005). This dissertation broaches the question of whether children can use this information in syntax acquisition by asking if learners can use the prosodic correlates of clauses to locate syntactic constituents. One property of certain syntactic constituents in natural languages is that they can move, so learning of constituency was inferred if participants treated prosodically-grouped words as cohesive, moveable chunks. In Experiment 1, 19-month-olds were familiarized with sentences from an artificial grammar with either 1-clause or 2-clause prosody. The infants from the 2-clause group later recognized the prosodically-marked clauses when they had moved to a new position in the sentence and had a new acoustic contour. Adults in Experiment 2 showed similar learning, although their judgments also rely on recognition of perceptually-salient words at prosodic boundaries. Subsequent experiments explored the mechanisms underlying this prosodic bootstrapping by testing Japanese-acquiring infants on English-based stimuli (Experiment 3) and English-acquiring infants on Japanese-based stimuli (Experiment 4). Infants were able to locate constituent-like groups of words with both native and non-native prosody, suggesting that the acoustic correlates of prosody are sufficiently robust across languages that they can be used in early syntax acquisition without extensive exposure to language-specific prosodic features. On the other hand, adults (Experiment 5) are less flexible, and are only able to use prosody consistent with their native language, suggesting an age- or experience-related tuning of the prosodic perceptual mechanism. This dissertation supports prosody as an important cue that allows infants and young children to break into syntax even before they understand many words, and helps explain the rapid rate of syntax acquisition.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-04-05T13:59:08Z No. of bitstreams: 1 azussamatsuoka.pdf: 3758292 bytes, checksum: 774cb991b0c5692d75381aa929113ca5 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-04-24T03:40:59Z (GMT) No. of bitstreams: 1 azussamatsuoka.pdf: 3758292 bytes, checksum: 774cb991b0c5692d75381aa929113ca5 (MD5) / Made available in DSpace on 2016-04-24T03:40:59Z (GMT). No. of bitstreams: 1 azussamatsuoka.pdf: 3758292 bytes, checksum: 774cb991b0c5692d75381aa929113ca5 (MD5) Previous issue date: 2013-12-18 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Esta tese investiga a contribuição das propriedades prosódicas da fala dirigida à criança (FDC) para a aquisição do adjetivo no Português Brasileiro (PB). No PB, os adjetivos constituem uma categoria sem marca morfológica obrigatória de gênero e sem posição sintática fixa. Além disso, adjetivos e nomes compartilham marcas morfofonológicas de gênero e número e podem aparecer imediatamente após o Determinante (DET) no DP, o que poderia dificultar a distinção entre essas duas categorias lexicais pela criança no processo de aquisição. Assim, esta tese busca, como objetivo geral, investigar o papel das pistas prosódicas de ADJ(etivo) na fala dirigida à criança brasileira para a aquisição lexical. Assumimos a perspectiva gerativista e o modelo de língua proposto pelo Programa Minimalista (CHOMSKY, 1995 e anos seguintes). Assumimos a Hipótese do Bootstrapping Prosódico (CHRISTOPHE et al.,1997; MORGAN & DEMUTH, 1996) como explicação do modo pelo qual a criança procede à formação do seu léxico inicial e à aquisição da sintaxe de sua língua, pela exploração de habilidades perceptuais. Como objetivos específicos, a presente tese busca: (i) em situação de interação mãe-criança, caracterizar propriedades prosódicas de N(ome) e ADJ no DP pleno na FDC; (ii) investigar a sensibilidade de bebês, em seu primeiro ano de vida, a pistas prosódicas da FDC brasileira, relativas ao posicionamento de ADJ no DP pleno; (iii) verificar o papel das pistas prosódicas de ADJ no PB no mapeamento de palavras novas a propriedades de objetos por crianças em torno de 2 e 3 anos. Na primeira atividade experimental, observamos que os parâmetros prosódicos de ADJ são realçados, se comparados aos de N, em FDC produzida em situação de interação semiespontânea. Na segunda atividade experimental, bebês em seu primeiro ano de vida parecem ser sensíveis às distinções de ordem prosódica dos DPs plenos, nos quais a posição do ADJ foi manipulada. Na terceira atividade experimental, crianças de 2 e 3 anos exploraram pistas prosódicas de ADJ para o mapeamento de pseudopalavras em função de adjetivos. Em conjunto, os resultados obtidos são compatíveis com a hipótese de que as pistas prosódicas são fonte robusta para a distinção dos elementos lexicais de N e ADJ na FDC brasileira e sustentam a tese de que o uso dessas pistas pode ser relevante para a aquisição de ADJ e para o desencadeamento do processo de aquisição lexical pela criança brasileira. / This thesis investigates the role of prosodic properties of infant directed speech (IDS) for the acquisition of adjectives in Brazilian Portuguese (BP). In BP, adjectives constitute a category that does not present fixed morphological mark or syntactic position. Besides, adjectives and nouns share mopho-phonological morphemes, and either one can follow DET- in the DP. This study aims at investigating the role of prosodic cues of ADJ(ective) in Brazilian IDS for distinguishing lexical elements of ADJ(adjectivs) and N(ouns) and for the process of language acquisition. The generative language model proposed by Chomsky (1995, and subsequent works), Minimalism Program is assumed. We also assume the Prosodic/Phonological Bootstrapping Hypothesis (MORGAN & DEMUTH, 1996; CHRISTOPHE et al., 1997) that explains how children acquire their lexicon exploring perceptual abilities. Our specific objectives are: (i) characterize prosodic properties of N and ADJ in the DP, in a mother-child interactive situation; (ii) investigate infants sensitivity to prosodic cues of Brazilian IDS, related to the position of ADJ in the DP; (iii) verify the role of prosodic properties of the adjective in BP for the mapping of pseudo words to object properties by 2- and 3- year-old children. In the first experiment, we observed that ADJ is accented, in comparison to N, when IDS was produced in a semi-spontaneous environment. In the second experiment, infants were sensitive to prosodic distinctions in DPs, in which the position of ADJ was manipulated. In the third experiment, 2- and 3- year-old used prosodic cues of ADJ to map novel words to properties. Our results are compatible with the hypothesis that prosodic cues are reliable sources of information for the distinction of the lexical elements of N and ADJ in Brazilian IDS and indicate that prosodic cues might be relevant for the acquisition of ADJ and for the bootstrapping of the process of lexical acquisition by Brazilian children.