Sentences that have more than one possible meaning are said to be syntactically ambiguous (SA). Because the correct interpretation of these sentences can be unclear, resolving SA sentences can be cognitively demanding for children, particularly with regards to inhibitory control (IC). In this study we provide three lines of evidence supporting the importance of IC in SA resolution. First, we show that children with higher IC resolve more SA sentences correctly. Second, we show that SA resolution is worse on tasks that place higher demands on IC, even for children with high IC. Third, we show that children with higher IC make different types of SA errors than children with lower IC. This study expands understanding of the cognitive skills underlying language and suggests a need to consider task demands on IC when developing educational curriculums.

We report two offline and two eye-movement experiments examining non-native (L2) sentence processing during and after reanalysis of temporarily ambiguous sentences like “While Mary dressed the baby laughed happily”. Such sentences cause reanalysis at the main clause verb (“laughed”), as the temporarily ambiguous noun phrase (“the baby”) may initially be misanalysed as the direct object of the subordinate clause verb (“dressed”). The offline experiments revealed that L2ers have difficulty reanalysing temporarily ambiguous sentences with a greater persistence of the initially assigned misinterpretation than native (L1) speakers. In the eye-movement experiments, we found that L2ers complete reanalysis similarly to L1ers but fail to fully erase the memory trace of the initially assigned interpretation. Our results suggested that the source of L2 reanalysis difficulty is a failure to erase the initially assigned misinterpretation from memory rather than a failure to conduct syntactic reanalysis.