Spontaneous analog number representations in 3‐year‐old children

When enumerating small sets of elements nonverbally, human infants often show a set‐size limitation whereby they are unable to represent sets larger than three elements. This finding has been interpreted as evidence that infants spontaneously represent small numbers with an object‐file system instead of an analog magnitude system ( Feigenson, Dehaene & Spelke, 2004 ). In contrast, non‐human animals and adult humans have been shown to rely on analog magnitudes for representing both small and large numbers ( Brannon & Terrace, 1998 ; Cantlon & Brannon, 2007 ; Cordes, Gelman, Gallistel & Whalen, 2001). Here we demonstrate that, like adults and non‐human animals, children as young as 3 years of age spontaneously employ analog magnitude representations to enumerate both small and large sets. Moreover, we show that children spontaneously attend to numerical value in lieu of cumulative surface area. These findings provide evidence of young children’s greater sensitivity to number relative to other quantities and demonstrate continuity in the process they spontaneously recruit to judge small and large values.     

Cognitive components of a mathematical processing network in 9‐year‐old children

We determined how various cognitive abilities, including several measures of a proposed domain‐specific number sense, relate to mathematical competence in nearly 100 9‐year‐old children with normal reading skill. Results are consistent with an extended number processing network and suggest that important processing nodes of this network are phonological processing, verbal knowledge, visuo‐spatial short‐term and working memory, spatial ability and general executive functioning. The model was highly specific to predicting arithmetic performance. There were no strong relations between mathematical achievement and verbal short‐term and working memory, sustained attention, response inhibition, finger knowledge and symbolic number comparison performance. Non‐verbal intelligence measures were also non‐significant predictors when added to our model. Number sense variables were non‐significant predictors in the model and they were also non‐significant predictors when entered into regression analysis with only a single visuo‐spatial WM measure. Number sense variables were predicted by sustained attention. Results support a network theory of mathematical competence in primary school children and falsify the importance of a proposed modular ‘number sense’. We suggest an ‘executive memory function centric’ model of mathematical processing. Mapping a complex processing network requires that studies consider the complex predictor space of mathematics rather than just focusing on a single or a few explanatory factors.     

Comprehension and production of body part labels in 2‐ to 3‐year‐old children

This study examined which body part labels children could (i) produce when the experimenter touched different locations on her own body, asking each time ‘What's this?’ and (ii) comprehend by touching the correct locations on their own bodies in response to the experimenter asking ‘Where's the [body‐part label]?’. Seventeen children aged between 26 and 41 months, tested in a repeated measures procedure, were presented with 50 different body part stimuli in 200 test trials per child. Overall, the children produced fewer body part labels than they could comprehend. The accuracy of children's responses depended on (i) the location or extent of each body part (facial and broad body features were better known; joints and features in or attached to broad body parts the least well known); (ii) the amount of sensory (but not motor) representation each body part has in the human cortex; and (iii) whether a body part was commonly named by caregivers. These results present a precise mapping of the body parts that young children are able to name and locate on their own bodies in response to body part names; they suggest several possible determinants of lexical‐semantic body knowledge and add to the understanding of how it develops in childhood.     

Ensemble perception of size in 4–5‐year‐old children

Groups of objects are nearly everywhere we look. Adults can perceive and understand the ‘gist’ of multiple objects at once, engaging ensemble‐coding mechanisms that summarize a group's overall appearance. Are these group‐perception mechanisms in place early in childhood? Here, we provide the first evidence that 4–5‐year‐old children use ensemble coding to perceive the average size of a group of objects. Children viewed a pair of trees, with each containing a group of differently sized oranges. We found that, in order to determine which tree had the larger oranges overall, children integrated the sizes of multiple oranges into ensemble representations. This pooling occurred rapidly, and it occurred despite conflicting information from numerosity, continuous extent, density, and contrast. An ideal observer analysis showed that although children's integration mechanisms are sensitive, they are not yet as efficient as adults’. Overall, our results provide a new insight into the way children see and understand the environment, and they illustrate the fundamental nature of ensemble coding in visual perception.     

Can 2‐ and 3‐year‐old children be trained to perform visual perception tasks?

Children aged 2 and 3 years were exposed to a novel paradigm designed to train visual perception skills. The results indicate that children of this age could be trained to perform both percept deprivation and percept diagnosis tasks. Results are discussed with reference to engagement, a precursor to an adult‐like understanding of perception.     

Words,shape, visual search and visual working memory in 3‐year‐old children

Do words cue children's visual attention, and if so, what are the relevant mechanisms? Across four experiments, 3‐year‐old children (N = 163) were tested in visual search tasks in which targets were cued with only a visual preview versus a visual preview and a spoken name. The experiments were designed to determine whether labels facilitated search times and to examine one route through which labels could have their effect: By influencing the visual working memory representation of the target. The targets and distractors were pictures of instances of basic‐level known categories and the labels were the common name for the target category. We predicted that the label would enhance the visual working memory representation of the target object, guiding attention to objects that better matched the target representation. Experiments 1 and 2 used conjunctive search tasks, and Experiment 3 varied shape discriminability between targets and distractors. Experiment 4 compared the effects of labels to repeated presentations of the visual target, which should also influence the working memory representation of the target. The overall pattern fits contemporary theories of how the contents of visual working memory interact with visual search and attention, and shows that even in very young children heard words affect the processing of visual information.     

The role of associative strength and conceptual relations in matching tasks in 4‐ and 6‐year‐old children

T he associative strength between target and associates, a factor assumed to be critical but generally not controlled, and the type of conceptual relation (thematic and taxonomic) were manipulated independently in a matching to sample task to determine their respective effects on the matching behaviour of 4‐ and 6‐year‐old children. Perceptual similarity between target and associates was controlled and maintained at a low level. A preliminary task was designed to assess the associative strength between targets and several associated pictures. These judgments served to construct for each child the sets of stimuli used in the matching task. Exp. 1 opposed a strong and a weak associate with the target in different configurations: the sets included a target and two thematic associates, two taxonomic associates, or one associate of each type. Children were asked to choose the picture that “went well” with the target. Data revealed the role of associative strength on matching choices. This factor interacted sometimes with the greater availability of thematic relations in 4‐ and 6‐year‐old children. In Exp. 2, two other configurations were tested. Thematic and taxonomic associates were both either strongly or weakly related with the target. Results replicated those of Exp. 1 and extended them. They showed that younger children were biased towards thematic relations only when these relations corresponded to strong associations. Thus, increasing experience with objects appears to reinforce both associative strength and thematic orientation. Finally, in Exp. 3, instructions orienting toward taxonomic choices modified responses in 6‐year‐olds only. Altogether, these results show the influence of specific instances and suggest that preschoolers' matching decisions are partly stimulus driven.     

Processing of facial and non‐facial visual stimuli in 2–5‐year‐old children

The present experiments examined the degree to which analytic and holistic modes of processing play a role in the way 2–5‐year‐old children process facial and non‐facial visual stimuli. Children between 2 and 5 years of age were instructed to categorize faces (in Experiment 1) and non‐facial visual stimuli, such as birds and planes (in Experiment 2), into two categories. The categories were so constructed as to allow the children to categorize the facial and non‐facial stimuli either analytically (by focusing on a single attribute) or holistically (in terms of overall similarity). The results demonstrated that the previous conclusions concerning older children's (from 6 years onwards) holistic mode of facial processing could not be generalized to younger children because most of the 2–5‐year olds processed the faces by taking single facial attributes into account. A similar pattern of results emerged for the processing of objects, showing that the majority of the children focused on single attributes. Thus, for both visual domains, holistic processing was the exception rather than the rule. Copyright © 2002 John Wiley & Sons, Ltd.     

Facial identity and facial expression matching in 5–12‐year‐old children and adults

Facial identity and facial expression matching tasks were completed by 5–12‐year‐old children and adults using stimuli extracted from the same set of normalized faces. Configural and feature processing were examined using speed and accuracy of responding and facial feature selection, respectively. Facial identity matching was slower than face expression matching for all age groups. Large age effects were found on both speed and accuracy of responding and feature use in both identity and expression matching tasks. Eye region preference was found on the facial identity task and mouth region preference on the facial expression task. Use of mouth region information for facial expression matching increased with age, whereas use of eye region information for facial identity matching peaked early. The feature use information suggests that the specific use of primary facial features to arrive at identity and emotion matching judgments matures across middle childhood. Copyright © 2009 John Wiley & Sons, Ltd.     

Development of navigational working memory: Evidence from 6‐ to 10‐year‐old children

The ability to learn complex environments may require the contribution of different types of working memory. Therefore, we investigated the development of different types of working memory (navigational, reaching, and verbal) in 129 typically developing children. We aimed to determine whether navigational working memory develops at the same rate as other types of working memory and whether the gender differences reported in adults are already present during development. We found that navigational working memory is less developed than both verbal and reaching working memory and that gender predicts performance only for navigational working memory. Our results are in line with reports that children made significantly more errors in far space than adults, showing that near space representation develops before far space representation.     

A measure of inspection time in 4‐year‐old children: The Benny Bee IT task

Inspection time (IT) measures speed of information processing without the confounding influence of motor speed. While IT has been found to relate to cognitive abilities in adults and older children, no measure of IT has been validated for use with children younger than 6 years. This study examined the validity of a new measure of IT for preschool children. N=71 4‐year‐old children completed the new IT task and standardized measures of fluid ability, visuospatial ability, and speed of processing. N=50 adults completed the same tasks and, additionally, a standard IT task. Results showed that the new IT task is a stable, reliable measure of IT in 4‐year‐old children. The new task had reasonable concurrent validity with the standard IT task in adults and the relationships between cognitive abilities, particularly general cognitive ability, and IT are sufficiently similar in young children and adults to suggest that the new IT task may be a useful tool for research in populations where IT was previously not measurable.     

Performance on Stroop‐like assessments of inhibitory control by 4‐ and 5‐year‐old children

The rapid development of an aspect of executive functioning (EF), inhibitory control (IC), between the ages of 3‐ and 5‐years, leads to an increase in a child's capacity to suppress inappropriate responding and therefore activate the necessary resources to carry‐out goal‐directed activity (Psychological Bulletin, 1997, 121 , 65–94). To measure EF in children, tasks administered clinically to adults are adapted. The Day–Night Stroop (DNS) is a pictorial modification of the Stroop Test (Journal of Experimental Psychology, 1935, 18 , 642–662), developed for pre‐literate children. Although suitable as a measure of IC in 3‐ to 4‐year‐old children, ceiling effects have been reported on the DNS in slightly older preschoolers. The present study attempted to overcome this limitation by examining the suitability of two modified versions of the DNS in 4‐ to 5‐year‐old preschoolers. To investigate the executive demands made by both Stroop‐like tasks, their associations with another measure of IC (stop‐signal task) and a measure of working memory were examined. Counter to expectations, no significant association was found in performance between the two Stroop‐like tasks; however, the modified DNS developed in this study showed significant relationships with the other executive tasks. The results are discussed in relation to the different methodologies used by these Stroop measures. Implications of this study suggest that researchers should consider more test‐specific factors when assessing EF in young children. Copyright © 2010 John Wiley & Sons, Ltd.     

Maternal correlates of 2‐year‐old American Indian children's social‐emotional development in a Northern Plains tribe

The developmental experiences of very young American Indian children today are not well documented in the current literature. The present study sought to explore the social‐emotional development of American Indian toddlers living on a Northern Plains reservation, as a function of maternal variables. Mothers completed self‐report questionnaires about their experiences and their children's development. Observer ratings of children's development also were conducted. Maternal stress, substance use/abuse, perceptions of stress in the mother–child relationship, social support, and American Indian cultural identity were significantly related to children's social‐emotional development. This study is the first to explore these relationships in a Northern Plains American Indian sample of young children and their mothers. Results suggest possible points of intervention for improving the developmental outcomes of very young American Indian children.     

Behaviors speak louder than explicit reports: Implicit metacognition in 2.5‐year‐old children

Recent research has shown that children as young as age 3.5 show behavioral responses to uncertainty although they are not able to report it explicitly. In this study, we tested the hypothesis that some form of metacognition is already available to guide children's decisions before the age of 3. Two groups of 2.5‐ and 3.5‐year‐old children were asked to complete a forced‐choice perceptual identification test and to explicitly rate their confidence in each decision. Moreover, participants had the opportunity to ask for a cue to help them decide if their response was correct. Our results revealed that all children asked for a cue more often after an incorrect response than after a correct response in the forced‐choice identification test, indicating a good ability to implicitly introspect on the results of their cognitive operations. On the contrary, none of these children displayed metacognitive sensitivity when making explicit confidence judgments, consistent with previous evidence of later development of explicit metacognition. Critically, our findings suggest that implicit metacognition exists much earlier than typically assumed, as early as 2.5 years of age.     

The effects of type of instruction,animacy cues,and dimensionality of objects on the shape bias in 3‐ to 6‐year‐old children

Robust evidence exists for the shape bias, or children's tendency to extend novel names and categorize objects more readily on the basis of shape than on other object features. However, issues remain about the conditions that affect the shape bias and its importance as a linguistic device. In this research, we examined how type of instruction (common noun naming, proper noun naming, same kind, and goes with), animacy of objects (animate, inanimate), and dimensionality of objects (two‐dimensional, three‐dimensional) affect the shape bias in 3‐ to 6‐year‐old children. Overall, all children showed strong use of the shape bias with categorization (same kind, goes with) instructions, the former in line with the shape‐as‐cue theory. Additionally, the shape bias was quite robust in the inanimate condition, regardless of type of instruction or dimensionality of objects. However, in the animate condition, a proper noun naming instruction coupled with an animate object cue reduced the shape bias across both two‐ and three‐dimensional objects. Implications of these findings are presented.

Highlights

• This study assessed the “shape bias,” a linguistic strategy young children routinely use when confronted with the task of extending a novel name from one object to another.
• Novel name extension and categorization tasks were used in this study.
• Shape bias was affected by the type of instructions, animacy of objects, and dimensionality of objects.

     

Three‐year‐old children intervene in third‐party moral transgressions

We investigated children's moral behaviour in situations in which a third party was harmed (the test case for possession of agent‐neutral moral norms). A 3‐year‐old and two puppets each created a picture or clay sculpture, after which one puppet left the room. In the Harm condition, the remaining (actor) puppet then destroyed the absent (recipient) puppet's picture or sculpture. In a Control condition, the actor acted similarly but in a way that did not harm the recipient. Children protested during the actor's actions, and, upon the recipient's return, tattled on the actor and behaved prosocially towards the recipient more in the Harm than in the Control condition. This is the first study to show that children as young as 3 years of age actively intervene in third‐party moral transgressions.     

Anxiety disorders in 8–11‐year‐old children: Motor skill performance and self‐perception of competence

Ekornås, B., Lundervold, A. J., Tjus, T. & Heimann, M. (2010). Anxiety disorders in 8–11‐year‐old children: Motor skill performance and self‐perception of competence. Scandinavian Journal of Psychology, 51, 271–277. This study investigates motor skill performance and self‐perceived competence in children with anxiety disorders compared with children without psychiatric disorders. Motor skills and self‐perception were assessed in 329 children aged 8 to 11 years, from the Bergen Child Study. The Kiddie‐SADS PL diagnostic interview was employed to define a group of children with an anxiety disorder without comorbid diagnosis, and a control group (no diagnosis) matched according to gender, age, and full‐scale IQ. Children in the anxiety disorder group displayed impaired motor skills and poor self‐perceived peer acceptance and physical competence compared with the control group. Two‐thirds of the anxious boys scored on the Motor Assessment Battery for Children (MABC) as having motor problems. The present study demonstrated impaired motor skills in boys with “pure” anxiety disorders. Anxious children also perceived themselves as being less accepted by peers and less competent in physical activities compared with children in the control group.