Cette thèse avait pour objectif de tester la théorie de la rétrogenèse appliquée au langage des personnes atteintes de la maladie d’Alzheimer, afin de tirer des conclusions permettant d’adapter notre comportement aux patients et de mettre en place des méthodes de maintient dans le langage plus appropriées.Pour ce faire, trois tâches ont été mises en place : une tâche de fluence verbale (phonémique (lettre initiale P) puis sémantique (animaux)), une tâche de dénomination d’images, ainsi qu’une tâche de répétition de phrases. Trois groupes de participants ont été créés : un groupe de 80 personnes atteintes de la maladie d’Alzheimer, un groupe de 60 enfants, âgés de 3 à 11 ans, puis un groupe contrôle de personnes âgées saines. Le groupe des patients était divisé en 4 sous-groupes en fonction de leur score au MMSE. Il en était de même pour les enfants, répartis en trois sous-groupes.Les analyses effectuées par le biais de modèles mixtes, ont permis de montrer que le déclin du langage dans la maladie d’Alzheimer semble bien suivre un ordre symétrique à celui de son acquisition. L’effet d’AoA permet souvent d’expliquer ce phénomène. Toutefois, des différences entre les enfants et les personnes Alzheimer sont également observables : si le langage semble suivre une involution symétrique à celle de l’enfant, il n’en est pas moins que les processus sous-jacents impliqués ne sont pas les mêmes que chez l’enfant. / The aim of this thesis was to test retrogenesis hypothesis applied to the language of people with Alzheimer's disease, in order to draw conclusions allowing us to adapt our behavior to patients and to implement appropriate methods of maintaining language.To do this, three tasks were established: a verbal fluency task (phonemic (initial letter P) and then semantic (animals)), an picture naming task, and a sentence repetition task. Three groups of participants were created: a group of 80 people with Alzheimer's disease, a group of 60 children, aged 3 to 11, and a healthy elderly control group. The patient group was divided into 4 subgroups based on their MMSE score. It was the same for children, divided into three subgroups.Analyzes conducted runing mixed models have shown that the decline of language in Alzheimer's disease seems to follow a symmetrical order to that of its acquisition. The effect of AoA can often explain this phenomenon. However, differences between children and Alzheimer's patients are also observable: if the language seems to follow an involution symmetrical to that of the child, it is nonetheless that the underlying processes involved are not the same as in the child.

Hand gestures during speech lighten the speaker's cognitive load, provide lexical access, augment the precision of memory, and identify when a speaker is ready to learn a new skill (Abner, Cooperrider, Goldin-Meadow, 2015). Much of the research that has discovered these purposes of gesture have focused on gestures produced during speech in the speaker's first language. Many researchers use these findings to argue for the same cognitive benefits of gesture in the second language, though only little research of gesture and second language speech has been done. The present study sought to fill the gap between first and second language research on gesture production by investigating the differences between the gesticulation produced by bilinguals in their first and second languages as well as discover their perceptions of those gestures. Native English speakers bilingual in Spanish and native Spanish speakers bilingual in English were interviewed in both languages and their gestures were counted and compared between their first and second languages. Results showed that even though native Spanish speaker's gestured significantly more than native English speakers, all participants significantly increased their gesture production from their first to their second language. Task type also played an important part in this increase, wherein gestures increased only in descriptive and narrative tasks, but not in conversational role plays. Gestures also seemed to increase due to a heightened cognitive load within the tasks more so than due to increased anxiety levels, agreeing with previous research done in first language contexts. Participants also tended to base perceptions of gesture use on native cultural attitudes towards gesture, causing inconclusive results on speaker awareness of their co-speech gesture in either their native or second language. Some limitations suggest that this study be repeated with modifications, such as evaluating participant proficiency before interviewing and matching all participants to a specific range of time immersed in the foreign culture.

No description available.

No description available.

Entender como os indivíduos que falam mais de uma língua reconhecem e processam palavras de diferentes idiomas tem sido questão central nas pesquisas em multilinguismo. Nas últimas décadas, um grande número de estudos coletou evidências de que o reconhecimento de palavras em uma língua pode ser influenciado pelo conhecimento de palavras de outra língua, ou seja, o acesso lexical dos multilíngues seria não-seletivo, em que ambas as línguas estão ativas, independentemente da língua-alvo do contexto. Assim, o presente estudo buscou investigar a influência de L1 e L2 sobre a L3 em uma população trilíngue. Contou-se com uma amostra de 26 brasileiros trilíngues de português (L1), inglês (L2) e francês (L3) de proficiência diversa. Os sujeitos realizaram dois experimentos de decisão lexical em francês, o primeiro composto por estímulos em francês que eram cognatos com português, inglês ou ambas as línguas, e o segundo composto por homógrafos interlinguísticos nas mesmas condições. Os resultados nos levam a conclusões semelhantes aos estudos anteriores, dando suporte à hipótese de acesso lexical não-seletivo, demonstrando a existência de um efeito cognato na análise de percentual de erro no caso dos cognatos e dos falsos cognatos. Contudo, não foi possível encontrar um efeito cognato trilíngue como o esperado e tampouco verificar o efeito cognato nos tempos de reação. Esses resultados são discutidos, refletindo-se sobre a influência da proficiência, do tempo e da frequência de uso das línguas e do número de participantes do estudo. / Understanding how individuals who speak more than one language recognize and process words in different languages has been a central issue in multilingualism research. In recent decades, a great number of studies has gathered evidence demonstrating that the recognition of words in a language can be influenced by the knowledge of words in another language, that is, lexical access of multilingual individuals would be non-selective, meaning that both languages are active regardless of the target language. Thus, this study aimed at investigating the influence of the L1 and the L2 on the L3 in a group of trilinguals. The sample consisted of 26 Portuguese (L1), English (L2) and French (L3) Brazilian trilinguals with varied proficiency levels. Participants took part in two lexical decision tasks in French. The first was composed of French words that were cognates with Portuguese, English or both, while the second comprised interlinguistic homographs in the same conditions. The results indicate similar results to those from previous studies, which gives support to the non-selective lexical access hypothesis and demonstrates the existence of a cognate effect in the analysis of error percentage in the case of cognates and false cognates. However, it was not possible to find a trilingual cognate effect, as expected, and to verify the cognate effect in reaction times. Such results are discussed in light of proficiency, how long these languages have been used, how often they are used, and the number of participants in the study.

The incredible productivity and creativity of language depends on two fundamental resources: a mental lexicon and a mental grammar. Rules of grammar enable us to produce and understand complex phrases we have not encountered before and at the same time constrain the computation of complex expressions. The concepts of the mental lexicon and mental grammar have been thoroughly tested by comparing the use of regular versus non-regular word forms. Regular verbs (e.g. walk-walked) are computed using a suffixation rule in a neural system for grammatical processing; non-regular verbs (run-ran) are retrieved from associative memory. The role of regularity has only been explored for the past tense, where regularity is overtly visible. To explore the representation and encoding of regularity as well as the inflectional processes involved in the production of regular and non-regular verbs, this dissertation investigated three groups of German verbs: regular, irregular and hybrid verbs. Hybrid verbs in German have completely regular conjugation in the present tense and irregular conjugation in the past tense. Articulation latencies were measured while participants named pictures of actions, producing the 3rd person singular of regular, hybrid, and irregular verbs in present and past tense. Studying the production of German verbs in past and present tense, this dissertation explored the complexity of lexical entries as a decisive factor in the production of verbs. / Regularität spielt eine entscheidende Rolle bei der Produktion von Verben. Zweiroutenmodelle nehmen an, dass regelmäßige Formen aus Stamm und Suffixen zusammengesetzt werden und unregelmäßige Verben als ganze Form im mentalen Lexikon gespeichert sind. Ziel der Dissertation war eine ausführliche Untersuchung der Repräsentation von regelmäßigen und unregelmäßigen Verben im Deutschen sowie der morphologischen Prozesse bei ihrer Produktion. Dazu wurden drei Typen von Verben im Deutschen untersucht: Regelmäßige Verben (z.B. lachen) haben nur einen Stamm, irreguläre Verben (z.B. graben) haben mehrere Stämme und ihre Formen sind daher unvorhersagbar. Hybride Verben (z.B. singen) haben regelmäßige Formen im Präsens und unregelmäßige, unvorhersagbare im Präteritum. Besondere Berücksichtigung fand daher das Tempus bei der Generierung von Verben. Artikulationszeiten in einer Serie von Bild-Wort-Interferenzexperimenten lassen vermuten, dass Regularität nicht durch abstrakte generische Knoten repräsentiert ist wie es z.B. für Genus angenommen wird. Die Artikulationszeiten von allen drei Typen von Verben in einem weiteren Bildbenennungsexperiment haben gezeigt, dass Regularität eine Eigenschaft des gesamten Lexikoneintrags eines Verbs ist und nicht von individuellen Wortformen. Die präsentierten Daten sind eine Herausforderung für das Zweiroutenmodell (Pinker, 1999), sie sind jedoch mit einem Ansatz vereinbar, der komplexe Lexikoneinträge für unregelmäßige Verben annimmt.

Abstract Objective: The aim of the present study was to investigate mechanisms of real-time language production of adults who stutter. Method: Data were analyzed for 19 typically fluent young adults (TFA) and 19 young adults who stutter (AWS). Participants performed a masked picture priming task where priming stimuli consisted of two conditions 1) Identity- a masked printed prime word identical to the picture target label, and 2) Unrelated- a masked printed prime word unrelated to the picture target label. Brain event-related potentials (ERPs), time-locked to pictures eliciting spontaneous naming, were recorded, as well as naming accuracy and reaction times. Results: Masked priming effects on ERP components were compared between groups. Priming modulated N400 amplitude in TFA while, at the same latency, priming modulated P300 amplitude in AWS. N400 is attributed to processing of meaningful stimuli, and P300 is a measure of effortful control. An even later priming effect generalized to both groups. Conclusion: Results suggest that post-lexical processing was similar in AWS and TFA, while lexical-semantic processing operated differently. Whereas TFA evidenced automaticity in activation and selection of target picture labels, AWS evidenced enhanced attentional control during lexical selection. We propose that AWS recruited a compensatory attentional mechanism to stabilize activation of target words on the path to naming. These conclusions suggest that clinically, AWS may benefit from vocabulary enrichment and attentional control treatment.

Αντικείμενο μελέτης της παρούσας εργασίας αποτελεί ο βαθμός επιρροής της κεφαλής κατά την ανάγνωση παρατακτικών συνθέτων από ασθενείς με neglect dyslexia (ND). Ενώ η πλειοψηφία των συνθέτων της ελληνικής, τα επονομαζόμενα ‘υποτακτικά’ (subordinative compounds), υπακούουν στον νόμο της δεξιόστροφης κεφαλής (Williams, 1981) (π.χ. ελαφο-κυνηγός), τα παρατακτικά σύνθετα (coordinative compounds) δεν εμφανίζουν αυτή την κανονικότητα στη θέση της κεφαλής τους (π.χ αλατο-πίπερο). Κάποιοι θεωρητικοί μορφολόγοι θεωρούν ότι κανένα από τα δύο συστατικά δεν αποτελεί τη βάση του συνθέτου, ούτε μορφολογικά ούτε σημασιολογικά (Ralli, 2005: 174), άλλοι υποστηρίζουν ότι τα παρατακτικά εμφανίζουν δύο κεφαλές, τόσο στο α’ όσο και στο β’ συνθετικό (Kageyama, 2009), ενώ δεν λείπουν και αυτοί που επιχειρηματολογούν για την υπεροχή του δεύτερου συστατικού, λόγω του ότι αυτό καθορίζει το γένος, τον αριθμό και την πτώση των συνθέτων (Guevara & Scalise, 2008). Στο πλαίσιο αυτό, θα προσπαθήσουμε να απαντήσουμε στο ερώτημα της θεωρητικής μορφολογίας σχετικά με τη θέση της κεφαλής στα παρατακτικά [ΟΟ] και [ΕΕ] σύνθετα της Νέας Ελληνικής, καθώς και στο ερώτημα της κλινικής γλωσσολογίας σχετικά με το ρόλο της κεφαλής στην ανάκληση και επεξεργασία των συνθέτων από ασθενείς με neglect dyslexia. Ένα ιδιαίτερα σημαντικό χαρακτηριστικό των ασθενών με ND είναι η ικανότητά τους να αναγνωρίζουν και να σέβονται τα όρια των δύο συστατικών κατά την ανάγνωση των συνθέτων (Behrmann et al., 1990). Επιπλέον, οι Semenza et al. (2011) αναφέρουν για τα Ιταλικά ότι τα λάθη στο α’ συνθετικό είναι πολύ πιο συχνά στα σύνθετα των οποίων η κεφαλή συμπίπτει με το β’ συνθετικό, παρά όταν συμπίπτει με το πρώτο. Ο εξισορροπητικός ρόλος της κεφαλής ως προς την εμφάνιση λαθών πάνω στο συστατικό της, αναμένουμε να έχει αντίκτυπο και στη δική μας περίπτωση: τα υποτακτικά σύνθετα με την κεφαλή στα δεξιά θα πρέπει να εμφανίζουν περισσότερα λάθη στο α’ συνθετικό από τα παρατακτικά, εφόσον τα τελευταία έχουν δύο κεφαλές. Στο πείραμα ανάγνωσης που σχεδιάσαμε, συμπεριλάβαμε 31 παρατακτικά σύνθετα, ονοματικά και επιθετικά (π.χ. ψωμοτύρι ‘bread-cheese’ και κοντόχοντρος αντιστοίχως) και 32 υποτακτικά σύνθετα, επίσης ονοματικά και επιθετικά (π.χ. ερημονήσι και χοντροαλεσμένος αντιστοίχως), τα οποία είχαμε ελένξει ως προς όλες τις σημαντικές ψυχογλωσσολογικές και μορφολογικές παραμέτρους ανά γραμματική κατηγορία. Το πείραμα αυτό το διεξάγαμε σε μία ασθενή 79 ετών, η οποία έχει υποστεί ΔΕ αγγειακό εγκεφαλικό επεισόδιο (ΑΕΕ) και με βάση την επίδοσή της στο BELLS test έχει διαγνωσθεί με left-sided neglect dyslexia. Ενώ στα παρατακτικά σύνθετα της ονοματικής κατηγορίας, η ασθενής τείνει να παραλείπει ή να υποκαθιστά το α΄συστατικό των συνθέτων αυτών εξίσου συχνά με αυτό των υποτακτικών, δεν ισχύει το ίδιο και για τα επιθετικά παρατακτικά, κατά την ανάγνωση των οποίων ο ασθενής κάνει στατιστικά σημαντικά λιγότερα λάθη στο α’ συστατικό απ’ ότι στην ανάγνωση των αντίστοιχων υποτακτικών ( x²= 3.970, p < 0.05). Η συμβολή της παρούσας μελέτης μπορεί να συνοψιστεί στα ακόλουθα σημεία: Πρώτον, αποδεικνύεται ότι οι λεξικοί παράγοντες μπορούν να επηρεάσουν την επιλεκτική προσοχή σε μεγάλο βαθμό. Δεύτερον, παρέχονται τεκμήρια ότι η θεωρητική έννοια της κεφαλής έχει επίδραση στην επεξεργασία των συνθέτων, καθώς η εστίαση της προσοχής επηρεάζεται από και επικεντρώνεται στο συστατικό που λειτουργεί ως κεφαλή, έπειτα από την σιωπηρή ανάγνωση ολόκληρης της λέξης. Τρίτον, ως προς την επίδραση της κεφαλής στα παρατακτικά σύνθετα της ΚΝΕ, από την έρευνά μας προκύπτει ότι ένας διαχωρισμός ανάμεσα στα ονοματικά και τα επιθετικά παρατακτικά σύνθετα, με τα πρώτα να συμπεριφέρονται όπως τα υποτακτικά, ενώ τα δεύτερα να εμφανίζουν μια διευκόλυνση στην ανάγνωση ως απόρροια της ύπαρξης δύο κεφαλών. Στην τελευταία αυτή περίπτωση, ίσως η ανάγνωση επηρεάζεται από την δυνατότητα εναλλαγής της σειράς των όρων ορισμένων επιθετικών παρατακτικών συνθέτων (π.χ. μακρόστενος ~ στενόμακρος), αλλά αυτό είναι κάτι που απαιτεί περαιτέρω μελέτη. / Reading coordinative compound words is investigated in neglect dyslexia in order to assess the influence of ‘headedness’. While the majority of Modern Greek compounds, the so called ‘subordinative compounds’, comply with Williams’ (1981) ‘Righthand Head Rule’ (e.g. elafo-kinigos ‘deer-hunter’), coordinative compounds do not demonstrate clear headedness (e.g. alato-pipero ‘salt-pepper’). Some theoretical morphologists argue that none of the two constituents serves as the basis of the formation, neither morphologically nor semantically (Ralli, 2005: 174), others attest that the formations’ head coincides with their second constituent, because of the second’s constituent inflectional suffix which determine the gender, number and case of the compound (Guevara & Scalise, 2008), while others argue that coordinative compounds are double-headed (Kageyama, 2009). In this context, the theoretical morphology’s question regarding the position of the head in coordinative [NN] and [AA] Greek compounds will be addressed, as well as the question about the function of headedness in compounds’ retrieval and processing by patients suffering from neglect dyslexia. When reading compounds in neglect dyslexia, a common finding is that patients seem to respect the boundaries between the first and the second component (Behrmann et al., 1990). Moreover, Semenza et al. (2011) ascertained that left-headed Italian compounds are read better than right-headed compounds, indicating that the appearance of head on the first constituent, counterbalance the deficit at the processing of this first constituent. According to these findings, it seems reasonable to hypothesize that, if coordinative compounds are indeed headless or double-headed, patients with neglect dyslexia will make fewer mistakes in reading their left constituents compared to subordinative compounds, which have a clear head. A female 79-year old patient, who suffered RH damage and was affected by left-sided neglect dyslexia as diagnosed based on BELLS test, had to read 32 subordinative [NN] and [AA] compounds (e.g. domatosalata ‘tomato-salad’ and piknokatikimenos ‘densely populated’ respectively) and 32 coordinative [NN] and [AA] compounds (e.g. psomotiri ‘bread-cheese’ and glikopikros ‘sweet-bitter’ respectively). Compounds and their constituents were matched for frequency, familiarity, imageability, age of acquisition and orthographic neighbors. Patient performed significantly fewer substitution and omission errors on the left constituent of coordinative compounds when reading compound adjectives (x²= 3.970, p < 0.05), but the same amount of errors in subordinative and coordinative compounds when reading compound nouns. The contribution of the study can be summarized in the following points: First, it showed that lexical factors can influence selective attention to a great extent. Second, it showed that the theoretical concept of headedness does have a processing effect, with the head capturing more attention after implicit reading of the whole word. Third, as for headedness in Greek coordinative compounds, the study revealed a dissociation depending on grammatical class (adjectival vs. nominal compounds) with adjectival coordinative compounds behaving as double-headed while nominal coordinative compounds patterning with subordinative ones. A key factor here might be the interchangeable word order that characterizes adjectival coordinative compounds (e.g makrostenos ‘long-narrow’ ~ stenomakros ‘narrow-long’), but this is something that requires further research.

Esta dissertação tem como objetivo geral investigar o efeito de interferência semântica no acesso lexical bilíngue bimodal em um grupo de ouvintes bilíngues bimodais adultos que atuam como TILS - tradutores e intérpretes de LIBRAS – Língua Portuguesa por meio de uma Tarefa de Reconhecimento de Tradução. Quatro objetivos específicos nortearam a pesquisa: (a) verificar o efeito de interferência semântica durante o acesso lexical bilíngue bimodal; (b) avaliar o papel da certificação de proficiência em interpretação PROLIBRAS no desempenho dos participantes na tarefa experimental; (c) avaliar o papel da experiência tradutória, considerando o número de horas de trabalho por semana, no desempenho dos participantes na Tarefa de Reconhecimento de Tradução; e (d) avaliar o papel da experiência como intérpretes de Libras, considerando o número de anos de experiência de trabalho, na Tarefa de Reconhecimento de Tradução. Para a realização da pesquisa foram utilizados dois instrumentos, um Questionário de Histórico da Linguagem e Autoavaliação da Proficiência, e um Teste de Reconhecimento de Tradução desenvolvido especificamente para este estudo, no qual os participantes foram solicitados a observar sequências de sinais em um vídeo seguido de uma palavra em Língua Portuguesa e a responder se a palavra correspondia à tradução correta do sinal. A palavra em Língua Portuguesa poderia se enquadrar em uma das seguintes condições experimentais: tradução correta, tradução incorreta semanticamente relacionada, tradução incorreta semanticamente não relacionada. As hipóteses previam que (a) os participantes seriam mais rápidos em identificar itens na condição de tradução correta do que nas duas outras condições; (b) os intérpretes demonstrariam um menor percentual de erros ao identificar itens na condição de tradução correta do que nas duas outras condições, exibindo percentual de erros ainda maior na condição de tradução incorreta semanticamente relacionada; (c) os participantes que declarassem possuir o certificado de proficiência em interpretação PROLIBRAS teriam um desempenho mais rápido e menor percentual de erros na tarefa; (d) os intérpretes que declarassem atuar mais horas por semana teriam um desempenho mais rápido e menor percentual de erros; por fim, (e) que os participantes que declarassem ter mais anos de experiência seriam mais rápidos e obteriam um menor percentual de erros na tarefa. Os resultados confirmam o efeito de interferência semântica em bilíngues bimodais, embora a análise do papel da experiência linguística tenha revelado que não houve diferença de resultados entre os que possuem a certificação PROLIBRAS e os que não a possuem, sendo que o mesmo foi constatado entre os que trabalham mais ou menos anos como intérpretes. A análise dos resultados da experiência em termos de horas por semana, no entanto, revelou que a comparação entre o grupo que trabalha vinte horas com o que trabalha quarenta horas indicou que os que trabalham menos horas responderam mais rapidamente aos itens de todas as condições de tradução da tarefa. Os resultados são interpretados com base em teorias sobre a representação do conhecimento linguístico, do acesso lexical e da interferência semântica, e sugerem a presença do efeito de interferência semântica nos bilíngues testados. Além disso, a ausência de um efeito da certificação PROLIBRAS na tarefa é analisada como uma indicação da necessidade de se investigar mais profundamente formas alternativas de avaliar a experiência dos intérpretes. / This dissertation has as its general objective to study the semantic interference effect in bimodal bilingual lexical access in a group of hearing adults bimodal bilinguals who work as sign language interpreter LIBRAS – Portuguese through a Translation Recognition Task. Four specific objectives guided this research: (a) to verify the semantic interference effect during bilingual bimodal lexical access; (b) to assess the role of the PROLIBRAS interpreting proficiency certification on the performance of the participants during the experimental task; (c) to assess the role of the translation experience, considering the number of hours of work per week, on the performance of the participants during the Translation Recognition Task; and (d) to assess the role of the experience as interpreters, considering the number of years of work experience, seen through the Translation Recognition Task. In order to accomplish such goals two instruments were used: a Self-Proficiency and Language History Questionnaire and a Translation Recognition Task developed for this study, in which participants were asked to observe sequences of signs in video followed by a word in Portuguese and answer whether the word corresponded as the correct translation of the sign. The word in Portuguese could fit in one of the following experimental conditions: correct translation, semantic related incorrect translation, not semantic related incorrect translation. The hypotheses were that (a) the participants would be faster at identifying items on the correct translation condition than the other two conditions; (b) interpreters would have a smaller error rate at identifying items on the correct translation condition than the other two conditions, showing even more error rate on the semantic related incorrect translation condition; (c) the participants that would declare to own a LIBRAS proficiency certificate would show a faster performance and smaller error rate; and finally, (e) that participants that would declared to have more year of experience as interpreters would be faster and would have a smaller error rate on the task. The results confirmed the semantic interference effect in bimodal bilinguals, although the analyses of the role of the language experience showed no difference of results among those who own a PROLIBRAS certificate and those who do not. The same was seen among those work more or less years as interpreters. The analyses of the results of the experience in terms of hours per week, however, showed that the comparison between the group who work twenty hours with the group who work forty hours indicated that the ones who work fewer hours answered faster to the items in all the task conditions. The results are interpreted using as base the theories about language knowledge representation, lexical access and semantic interference. Besides, the lack of effect on the PROLIBRAS certificate on the task is analyzed as an indication of the need to study deeply alternative ways to assess the experience of the interpreters.

Entender como os indivíduos que falam mais de uma língua reconhecem e processam palavras de diferentes idiomas tem sido questão central nas pesquisas em multilinguismo. Nas últimas décadas, um grande número de estudos coletou evidências de que o reconhecimento de palavras em uma língua pode ser influenciado pelo conhecimento de palavras de outra língua, ou seja, o acesso lexical dos multilíngues seria não-seletivo, em que ambas as línguas estão ativas, independentemente da língua-alvo do contexto. Assim, o presente estudo buscou investigar a influência de L1 e L2 sobre a L3 em uma população trilíngue. Contou-se com uma amostra de 26 brasileiros trilíngues de português (L1), inglês (L2) e francês (L3) de proficiência diversa. Os sujeitos realizaram dois experimentos de decisão lexical em francês, o primeiro composto por estímulos em francês que eram cognatos com português, inglês ou ambas as línguas, e o segundo composto por homógrafos interlinguísticos nas mesmas condições. Os resultados nos levam a conclusões semelhantes aos estudos anteriores, dando suporte à hipótese de acesso lexical não-seletivo, demonstrando a existência de um efeito cognato na análise de percentual de erro no caso dos cognatos e dos falsos cognatos. Contudo, não foi possível encontrar um efeito cognato trilíngue como o esperado e tampouco verificar o efeito cognato nos tempos de reação. Esses resultados são discutidos, refletindo-se sobre a influência da proficiência, do tempo e da frequência de uso das línguas e do número de participantes do estudo. / Understanding how individuals who speak more than one language recognize and process words in different languages has been a central issue in multilingualism research. In recent decades, a great number of studies has gathered evidence demonstrating that the recognition of words in a language can be influenced by the knowledge of words in another language, that is, lexical access of multilingual individuals would be non-selective, meaning that both languages are active regardless of the target language. Thus, this study aimed at investigating the influence of the L1 and the L2 on the L3 in a group of trilinguals. The sample consisted of 26 Portuguese (L1), English (L2) and French (L3) Brazilian trilinguals with varied proficiency levels. Participants took part in two lexical decision tasks in French. The first was composed of French words that were cognates with Portuguese, English or both, while the second comprised interlinguistic homographs in the same conditions. The results indicate similar results to those from previous studies, which gives support to the non-selective lexical access hypothesis and demonstrates the existence of a cognate effect in the analysis of error percentage in the case of cognates and false cognates. However, it was not possible to find a trilingual cognate effect, as expected, and to verify the cognate effect in reaction times. Such results are discussed in light of proficiency, how long these languages have been used, how often they are used, and the number of participants in the study.