The point of departure of this study is the well-known hypothesis according to which structures that involve the syntax-pragmatics interface and instantiate a surface overlap between two languages are more vulnerable to crosslinguistic influence than purely syntactic domains (e.g. Müller and Hulk, 2001). In exploring the validity of this hypothesis for later stages of bilingual acquisition, the study aims to establish whether crosslinguistic influence occu only in one direction, i.e. from English to Greek, which structural factors can account for the directionality of crosslinguistic effects, and whether language dominance plays a role in determining the occurrence and the strength of these effects in older bilingual children. Experimental data are presented from 32 English-Greek eight-year-old simultaneous bilinguals -16 Greek-dominant living in Greece and 16 English-dominant living in the UK -and monolingual control groups. A number of syntax-pragmatics interface and narrow syntax structures were investigated and the results showed that both types of structures were found to be selectively vulnerable to crosslinguistic influence in the predicted direction, but only in the grammar of the English-dominant bilinguals.

Balanced bilinguals have been shown to have an enhanced ability to inhibit distracting information. In this study, we investigated the hypothesis that the bilinguals' efficiency in inhibitory control can be advantageous in some conditions, but disadvantageous in others-for example, negative priming conditions, in which previously irrelevant information becomes relevant. Data collected in a target-stimulus locating task from 29 early bilingual adults and 29 age-matched monolinguals showed that the bilinguals' greater inhibition of irrelevant spatial information (i.e., the position of a distractor stimulus) resulted in a smaller effect of the distractor presence (i.e., a smaller difference in error rates in trials with and without distractors) and a larger negative priming effect (i.e., a larger difference between the error rates shown in trials wherein the target position corresponded to the position of the previous-trial distractor and trials wherein the target was presented in a previously vacant position). These findings support the hypothesis of specific nonlinguistic cognitive effects of bilingualism on inhibitory control functions, which are not necessarily reflected in cognitive advantages.

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