The acquisition of Spanish null pronouns is an optimal domain for comparing the predictions of generativist vs. probabilistic approaches to language acquisition. This paper presents two studies on the acquisition of null subjects by English adult learners of Spanish as a second language. The first investigates a low frequency construction in which the antecedent of the pronoun is a quantifier, and the distribution is regulated by a principle of UG. The second looks at a high frequency context,where the distribution of the null pronoun depends on whether it is interpreted as focus or as discourse topic. The data indicate early mastery, and no development in the case of the low frequency quantifier construction, and gradual acquisition for the distribution of pronouns in discourse. These findings lend support to grammatical as opposed to probabilistic approaches to language learning.

This study examines the acquisition of the featural constraints on clitic and null distribution in Spanish among simultaneous and sequential Chinese-Spanish bilinguals from Peru. A truth value judgment task targeted the referential meaning of null objects in a negation context. Objects were elicited via two clitic elicitation tasks that targeted anaphoric contexts and left-dislocated topics. An acceptability task tested sensitivity to left-dislocated object drop. Although simultaneous bilinguals were mostly undistinguishable from monolinguals, the late learners differed from both of these groups across tasks. Age of arrival led to different outcomes, with late learners showing more deficits than the child learners. Late learners avoided using clitics and relied on lexical and null objects. Residual transfer effects were observed among the child learners in the form of insensitivity to the features that serve as the basis for null argument identification and clitic deficits in production. It is also argued that transfer persists despite early and intense exposure to the second language in a natural environment because of the existence of an unmarked argument identification option in the first language.

Can transfer occur in child bilingual syntax when surface overlap does not involve the syntax-pragmatics interface? Twenty-three Spanish/English bilingual children participated in an elicited imitation study of clitic placement in Spanish restructuring contexts, where variable word order is not associated with pragmatic or semantic factors. Bilingual children performed poorly with preverbal clitics, the order that does not overlap with English. Distinct bilingual patterns emerged: backward repositioning, omissions (for simultaneous bilinguals) and a reduction in forward repositioning bias. We conclude that transfer should be defined in lexical terms as the result of priming effects leading to shifts in lexical items.

This article assesses the impact of bilingualism on the acquisition of pronominal direct objects in French and English (clitics in French and strong pronouns in English). We show that, in comparison to monolingual children, bilingual children omit more pronominal objects for a longer period in both languages. At the same time, the development in each language spoken by the bilinguals follows the developmental asymmetry found in the language of their monolingual counterparts: there are more omissions in French than in English. It is also shown that language dominance affects the rate of omissions as there are fewer omissions in the language in which children receive more exposure, i.e. the dominant language. We analyze these results as reflecting a bilingual effect based on the retention of a default null object representation. This in turn is supported by reduced overall input for bilingual children and by language-internal input ambiguity.

The purpose of the current study is to examine language influence in sequential bilinguals. Specifically, this study evaluates whether performance in a first language predicts success in the acquisition of a second language nine months after exposure to the second language begins. Forty-nine Spanish-speaking children attending English-only pre-kindergarten classrooms participated in the study. Children were assessed in Spanish at the beginning of the school year using the Spanish version of the Bilingual English Spanish Assessment (BESA), MLU in words, and a lexical diversity measure, D, obtained from a language sample. Nine months later, children were assessed in English using the English-BESA. Analyses indicated significant correlations between semantic and grammatical measures across languages. Stepwise regression analyses found that grammatical and semantic measures in the first language robustly predicted grammatical and semantic measures in the second language. We propose that native language skills predict the success in second language acquisition, not because of linguistic transfer, but by virtue of individual differences in language learning abilities present in typical populations.