Inhibitory Control and Patterns of Errors in Resolution of Syntactically Ambiguous Sentences.

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.

Children's disambiguation of novel words varies by the number and position of phonological contrasts.

Young children often make pragmatic assumptions when learning new words. For example, they assume that a speaker who uses different words intends to refer to different things - the so-called principle of contrast. We used a standard disambiguation task to explore whether children's assumptions about contrast depend on how much words differ. Three- to 6-year-olds heard pairs of words that differed in terms of the number, position, and types of phonological contrasts. Results indicate that children were less likely to disambiguate words differing by one phoneme than words differing by two or more phonemes, particularly when those one-phoneme differences were located at the beginning or end of the words (as in fim/vim). Overall, the findings suggest that children's pragmatic assumptions about two contrasting words depend not only on if words differ, but also on how they differ.

Does group membership affect children's judgments of social transgressions?

Children judge in-group members more favorably than out-group members. They also judge moral transgressions as more serious and more worthy of punishment than conventional transgressions. Here we asked whether children's judgments of moral and conventional transgressions vary by the group membership of the transgressor (in-group, neutral, out-group, or self). In addition, we asked whether judgments of the transgressions would extend to the transgressors themselves, including cases in which the self was the transgressor. Results show that transgressions committed by out-group members were judged as being more serious and more punish-worthy than those committed by members of other groups. In addition, children judged out-group transgressors more harshly, and the self more leniently, than other group members. Overall, results suggest that group membership does affect judgments of transgressions and transgressors, with out-group members consistently judged the most negatively and the self consistently judged the least negatively. However, when judging the transgressor or the seriousness of the transgression, domain distinctions do persist even as group membership varies. Although, when assigning punishment, domain distinctions persist only when judging the transgressions of out-group members and neutral individuals. These findings demonstrate the powerful effect of group membership on the judgments of both acts and actors, indicating that when judging transgressions children consider not only the moral or conventional status of the act but also the group membership of the actor.

The effect of a tactile-to-visual shift on young children's tendency to map novel labels onto novel objects.

When taught a label for an object and then asked whether an exemplar of that object or a novel object is the referent of a novel label, children favor the novel object. Preschool-aged children tend not to show this so-called disambiguation effect, however, when the test objects are presented in a different sense modality than the original object. The current experiments used a touch-to-vision paradigm to test two explanations for this unexpected pattern. Experiment 1 asked whether children might fail to retrieve the original label and found that additional label training benefitted 3-year-olds but not 4-year-olds. Experiments 2 and 3 asked whether children's reaction to discovering the cross-modal match might interfere with how they process the request for the novel label and found that being allowed to share their discovery of the match benefitted 4-year-olds but not 3-year-olds. These findings support the proposal that the chief obstacle to cross-modal disambiguation changes during early childhood from difficulty in retrieving the known label to disruption caused by the discovery of the cross-modal match.

Matters of accuracy and conventionality: prior accuracy guides children's evaluations of others' actions.

Studies show that children trust previously reliable sources over previously unreliable ones (e.g., Koenig, Clément, & Harris, 2004). However, it is unclear from these studies whether children rely on accuracy or conventionality to determine the reliability and, ultimately, the trustworthiness of a particular source. In the current study, 3- and 4-year-olds were asked to endorse and imitate one of two actors performing an unfamiliar action, one actor who was unconventional but successful and one who was conventional but unsuccessful. These data demonstrated that children preferred endorsing and imitating the unconventional but successful actor. Results suggest that when the accuracy and conventionality of a source are put into conflict, children may give priority to accuracy over conventionality when estimating the source's reliability and, ultimately, when deciding who to trust.

Object movement in preschool children's word learning.

Two studies examined whether preschool children preferred to select a moving object over stationary objects when determining the referent of a novel word. In both studies three- and four-year-olds observed three novel objects, one moving object and two stationary objects. In Study 1, children (n=44) were asked to select the object that best matched a novel word. In Study 2, children (n=45) were asked to select the object that best matched a novel fact. Results across the two studies indicated that three- and four-year-olds showed a preference for selecting the moving object and that this preference was similar for both words and facts. These results suggest that preschool children are able to use movement to determine the referent of a novel word, especially when other cues are unavailable or unhelpful, but that movement may not be uniquely helpful for word learning.

Two-year-olds differentially disambiguate novel words and facts.

When presented with a pair of objects, one familiar and one unfamiliar, and asked to select the referent of a novel word, children reliably demonstrate the disambiguation effect and select the unfamiliar object. The current study investigated two competing word learning accounts of this effect: a pragmatic account and a word learning principles account. Two-, three- and four-year-olds were presented with four disambiguation conditions, a word/word, a word/fact, a fact/word and a fact/fact condition. A pragmatic account predicted disambiguation in all four conditions while a word learning principles account predicted disambiguation in the word/word and fact/word conditions. Results indicated that children disambiguated in word/word and fact/word conditions and two-year-olds disambiguated at above chance levels in the word/word condition but at BELOW chance levels in the fact/fact condition. Because disambiguation varied both as a function of age and condition these findings are presented as challenges to a pragmatic account of the disambiguation effect.