In a recent study, Lew-Williams and Fernald (2007) showed that native Spanish speakers use grammatical gender information encoded in Spanish articles to facilitate the processing of upcoming nouns. In this article, we report the results of a study investigating whether grammatical gender facilitates noun recognition during second language (L2) processing. Sixteen monolingual Spanish participants (control group) and 18 English-speaking learners of Spanish (evenly divided into high and low Spanish proficiency) saw two-picture visual scenes in which items matched or did not match in gender. Participants’ eye movements were recorded while they listened to 28 sentences in which masculine and feminine target items were preceded by an article that agreed in gender with the two pictures or agreed only with one of the pictures. An additional group of 15 Italian learners of Spanish was tested to examine whether the presence of gender in the first language (L1) modulates the degree to which gender is used during L2 processing. Data were analyzed by comparing the proportion of eye fixations on the objects in each condition. Monolingual Spanish speakers looked sooner at the referent on different-gender trials than on same-gender trials, replicating results reported in past literature. Italian-Spanish bilinguals exhibited a gender anticipatory effect, but only for the feminine condition. For the masculine condition, participants waited to hear the noun before identifying the referent. Like the Spanish monolinguals, the highly proficient English-Spanish speakers showed evidence of using gender information during online processing, whereas the less proficient learners did not. The results suggest that both proficiency in the L2 and similarities between the L1 and the L2 modulate the usefulness of morphosyntactic information during speech processing.

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We employ code-switching (the alternation of two languages in bilingual communication) to test the hypothesis, derived from experience-based models of processing (e.g., Boland, Tanenhaus, Carlson, & Garnsey, 1989; Gennari & MacDonald, 2009), that bilinguals are sensitive to the combinatorial distributional patterns derived from production and that they use this information to guide processing during the comprehension of code-switched sentences. An analysis of spontaneous bilingual speech confirmed the existence of production asymmetries involving two auxiliary + participle phrases in Spanish–English code-switches. A subsequent eye-tracking study with two groups of bilingual code-switchers examined the consequences of the differences in distributional patterns found in the corpus study for comprehension. Participants’ comprehension costs mirrored the production patterns found in the corpus study. Findings are discussed in terms of the constraints that may be responsible for the distributional patterns in code-switching production and are situated within recent proposals of the links between production and comprehension.

We investigated whether bilinguals’ integration of a code-switch during real-time comprehension, which involves resolving among conflicting linguistic representations, modulates the deployment of cognitive-control mechanisms. In the current experiment, Spanish-English bilinguals (N = 48) completed a cross-task conflict-adaptation paradigm that tested whether reading code-switched sentences triggers cognitive-control engagement that immediately influences performance on an ensuing Flanker trial. We observed that, while incrementally processing sentences, detecting a code-switch (as opposed to reading sentences that did not contain a code-switch) assisted subsequent conflict resolution. Such temporal interdependence between confronting cross-linguistic conflict and ensuing adjustments in behavior indicates that integrating a code-switch during online comprehension may recruit domain-general cognitive-control procedures. We propose that such control mechanisms mobilize to resolve among competing representations that arise across languages during real-time parsing of code-switched input. Overall, the findings provide novel insight into what language-processing demands of bilingualism regulate cognitive-control performance moment by moment.

Researchers who study code-switching using lab-based approaches face a series of methodological challenges; these include, but are not limited to, using adequate techniques and tasks that allow for processing that reflects real-language usage and selecting stimuli that reflect the participants’ code-switching community norms. We present two illustrative eye-tracking studies that consider these challenges. Study 1 tests whether experience with code-switching leads to differential processing of Spanish determiner-English noun code-switches (e.g.,una cookie‘a cookie’). Study 2 examines auxiliary-verb code-switches involving the progressive structure (e.g.,están cooking‘are cooking’) and perfect structure (e.g.,han cooked‘have cooked’) while participants read either for comprehension or provide grammaticality judgments. The results of both studies highlight the advantages that eye-tracking provides when its use is accompanied by an appropriate bilingual sample, by stimuli that reflect actual bilingual language use, and by secondary tasks that do not invoke metalinguistic processes.