Fathers' Infant‐Directed Speech in a Small‐Scale Society

When speaking to infants, mothers often alter their speech compared to how they speak to adults, but findings for fathers are mixed. This study examined interactions (N = 30) between fathers and infants (M_age ± SD = 7.8 ± 4.3 months) in a small‐scale society in Vanuatu and two urban societies in North America. Fundamental frequency (F₀) and speech rate were measured in infant‐directed and adult‐directed speech. When speaking to infants, fathers in both groups increased their F₀ range, yet only Vanuatu fathers increased their average F₀. Conversely, North American fathers slowed down their speech rate to infants, whereas Vanuatu fathers did not. Behavioral traits can vary across distant cultures while still potentially solving similar communicative problems.     

The Early Construction of Spatial Attention: Culture,Space, and Gesture in Parent–Child Interactions

American and Israeli toddler–caregiver dyads (mean age of toddler = 26 months) were presented with naturalistic tasks in which they must watch a short video (N = 97) or concoct a visual story together (N = 66). English‐speaking American caregivers were more likely to use left to right spatial structuring than right to left, especially for well‐ordered letters and numbers. Hebrew‐speaking Israeli parents were more likely than Americans to use right to left spatial structuring, especially for letters. When constructing a pictorial narrative for their children, Americans were more likely to place pictures from left to right than Israelis. These spatial structure biases exhibited by caregivers are a potential route for the development of spatial biases in early childhood, before children have developed automatic reading and writing habits.     

“Everything Happens for a Reason”: Children's Beliefs About Purpose in Life Events

Do children believe that “everything happens for a reason?” That is, do children endorse purpose‐based, teleological explanations for significant life events, as they do for social behavior, artifacts, biological properties, and natural kinds? Across three experiments, 5‐ to 7‐year‐olds (N = 80), 8‐ to 10‐year‐olds (N = 72), and adults (N = 91) chose between teleological and nonteleological accounts of significant life events and judged how helpful those accounts were for understanding an event's cause. Five‐ to 7‐year‐olds favored teleological explanations, but this preference diminished with age. Five‐ to 7‐year‐olds and 8‐ to 10‐year‐olds also found teleological explanations more helpful than did adults. Perceiving purpose in life events may therefore have roots in childhood, potentially reflecting a more general sensitivity to purpose in the social and natural worlds.     

Modeling Prosocial Behavior Increases Helping in 16-Month-Olds

In two experiments, the imitation of helping behavior in 16-month-olds was investigated. In Study 1 (N = 31), infants either observed an adult model helping or not helping another individual before they had the opportunity to assist an unfamiliar experimenter. In one of two tasks, more children helped in the prosocial model condition than in the no model control condition. In Study 2 (N = 60), a second control condition was included to test whether infants imitated the prosocial intention (no neediness control). Children in the prosocial model condition helped more readily than children in the no model condition, with the second control condition falling in between. These findings propose that modeling provides a critical learning mechanism in early prosocial development.     

Prelinguistic Relational Concepts: Investigating Analogical Processing in Infants

This research asks whether analogical processing ability is present in human infants, using the simplest and most basic relation—the same–different relation. Experiment 1 (N = 26) tested whether 7‐ and 9‐month‐olds spontaneously detect and generalize these relations from a single example, as previous research has suggested. The attempted replication failed. Experiment 2 asked whether infants could abstract the relation via analogical processing (Experiment 2, N = 64). Indeed, with four exemplars, 7‐ and 9‐month‐olds could abstract the same–different relation and generalize it to novel pairs. Furthermore, prior experience with the objects disrupted learning. Facilitation from multiple exemplars and disruption by individual object salience are signatures of analogical learning. These results indicate that analogical ability is present by 7 months.     

Being Mimicked Increases Prosocial Behavior in 18‐Month‐Old Infants

Most previous research on imitation in infancy has focused on infants' learning of instrumental actions on objects. This study focused instead on the more social side of imitation, testing whether being mimicked increases prosocial behavior in infants, as it does in adults (van Baaren, Holland, Kawakami, & van Knippenberg, 2004). Eighteen‐month‐old infants (N = 48) were either mimicked or not by an experimenter; then either that experimenter or a different adult needed help. Infants who had previously been mimicked were significantly more likely to help both adults than infants who had not been mimicked. Thus, even in infancy, mimicry has positive social consequences: It promotes a general prosocial orientation toward others.     

The Impact of Early Social Interactions on Later Language Development in Spanish–English Bilingual Infants

This study tested the impact of child‐directed language input on language development in Spanish–English bilingual infants (N = 25, 11‐ and 14‐month‐olds from the Seattle metropolitan area), across languages and independently for each language, controlling for socioeconomic status. Language input was characterized by social interaction variables, defined in terms of speech style (“parentese” vs. standard speech) and social context (one‐on‐one vs. group). Correlations between parentese one‐on‐one and productive vocabulary at 24 months (n = 18) were found across languages and in each language independently. Differences are highlighted between previously published monolingual samples, which used the same methods as the current study of bilingual infants. The results also suggest cultural effects on language input and language development in bilingual and bicultural infants.     

Measuring Beliefs in Centimeters: Private Knowledge Biases Preschoolers' and Adults' Representation of Others' Beliefs

A novel task, using a continuous spatial layout, was created to investigate the degree to which (in centimeters) 3‐year‐old children's (N = 63), 5‐year‐old children's (N = 60), and adults' (N = 60) own privileged knowledge of the location of an object biased their representation of a protagonist's false belief about the object's location. At all ages, participants' knowledge of the object's actual location biased their search estimates, independent of the attentional or memory demands of the task. Children's degree of bias correlated with their performance on a classic change‐of‐location false belief task, controlling for age. This task is a novel tool for providing a quantitative measurement of the degree to which self‐knowledge can bias estimates of others' beliefs.     

The Role of Speaker Knowledge in Children's Pragmatic Inferences

During communication, conversational partners should offer as much information as is required and relevant. For instance, the statement “Some Xs Y” is infelicitous if one knows that all Xs Y. Do children understand the link between speaker knowledge and utterance strength? In Experiment 1, 5‐year‐olds (N = 32) but not 4‐year‐olds (N = 32) reliably connected statements of different logical strength (e.g., “The girl colored all/some of the star”) to observers who were fully or partially informed. Four‐year‐olds’ performance improved when observer knowledge could be assessed more easily (Experiment 2a, N = 25) but remained the same in a nonlinguistic version of Experiment 1 that preserved the epistemic requirements of the original study (Experiment 2b, N = 26). These findings have implications for the development of early communicative abilities.     

Does An Early Intervention Influence Behavioral Development Until Age 9 in Children Born Prematurely?

This study examined whether the Mother–Infant Transaction Program prevents behavioral problems among preterm children (birth weight < 2000 g) until age 9. The program was administered to 72 preterms, while 74 preterms and 75 full‐terms formed control groups (N = 221). Behavior was reported by parents (Child Behavior Checklist) and teachers (Teachers Report Form) and by all on selected Strengths and Difficulties Questionnaire (SDQ) questions. Long‐term behavioral development appeared to be qualitatively unaffected by the intervention. At ages 7 and 9, fewer attention problems and better adaptation to school were reported from parents and teachers of the intervention group compared to preterm controls. At age 9, teachers reported fewer difficulties in the intervention group and better academic performance. In these areas they were reported as being at the statistically same level as term controls.     

Early Attachment Organization With Both Parents and Future Behavior Problems: From Infancy to Middle Childhood

Links between children's attachment security with mothers and fathers, assessed in Strange Situation with each parent at 15 months (N = 101), and their future behavior problems were examined. Mothers and fathers rated children's behavior problems, and children reported their own behavior problems at age 8 (N = 86). Teachers rated behavior problems at age 6½ (N = 86). Insecurity with both parents had a robust effect: “Double‐insecure” children reported more overall problems, and were rated by teachers as having more externalizing problems than those secure with at least 1 parent. Security with either parent could offset such risks, and security with both conferred no additional benefits. High resistance toward both parents in Strange Situation may confer “dual risk” for future externalizing behavior.     

Attention to Faces Expressing Negative Emotion at 7 Months Predicts Attachment Security at 14 Months

To investigate potential infant‐related antecedents characterizing later attachment security, this study tested whether attention to facial expressions, assessed with an eye‐tracking paradigm at 7 months of age (N = 73), predicted infant–mother attachment in the Strange Situation Procedure at 14 months. Attention to fearful faces at 7 months predicted attachment security, with a smaller attentional bias to fearful expressions associated with insecure attachment. Attachment disorganization in particular was linked to an absence of the age‐typical attentional bias to fear. These data provide the first evidence linking infants' attentional bias to negative facial expressions with attachment formation and suggest reduced sensitivity to facial expressions of negative emotion as a testable trait that could link attachment disorganization with later behavioral outcomes.     

The Self‐Reference Effect on Memory in Early Childhood

The self‐reference effect in memory is the advantage for information encoded about self, relative to other people. The early development of this effect was explored here using a concrete encoding paradigm. Trials comprised presentation of a self‐ or other‐image paired with a concrete object. In Study 1, 4‐ to 6‐year‐old children (N = 53) were asked in each trial whether the child pictured would like the object. Recognition memory showed an advantage for self‐paired objects. Study 2 (N = 55) replicated this finding in source memory. In Study 3 (N = 56), participants simply indicated object location. Again, recognition and source memory showed an advantage for self‐paired items. These findings are discussed with reference to mechanisms that ensure information of potential self‐relevance is reliably encoded.     

Essentialization of Social Categories Across Development in Two Cultures

Children display an “essentialist” bias in their everyday thinking about social categories. However, the degree and form of this bias varies with age and with the nature of the categories, as well as across cultures. This project investigated the development of the essentialist bias across five social categories (i.e., gender, nationality, religious affiliation, socioeconomic status (rich/poor), and sports-team supporter) in two countries. Children between 5 and 10 years of age in Turkey (Study 1, N = 74) and the United States (Study 2, N = 73), as well as adults in both countries (Study 3, N = 223), participated. Results indicate surprising cross-cultural parallels with respect to both the rank ordering of essentialist thinking across these five categories and increasing differentiation among them over development.     

Children's Increased Emotional Egocentricity Compared to Adults Is Mediated by Age‐Related Differences in Conflict Processing

This study investigated the cognitive mechanisms underlying age‐related differences in emotional egocentricity bias (EEB) between children (aged 7–12 years, n = 30) and adults (aged 20–30 years, n = 30) using a novel paradigm of visuogustatory stimulation to induce pleasant and unpleasant emotions. Both children and adults showed an EBB, but that of children was larger. The EEB did not correlate with other measures of egocentricity. Crucially, the developmental differences in EEB were mediated by age‐related changes in conflict processing and not visual perspective taking, response inhibition, or processing speed. This indicates that different types of egocentricity develop independently of one another and that the increased ability to overcome EEB can be explained by age‐related improvements in conflict processing.     

Self‐Socialization of Gender in African American,Dominican Immigrant,and Mexican Immigrant Toddlers

This article advances a self‐socialization perspective demonstrating that children's understanding of both gender categories represents an intergroup cognition that is foundational to the development of gender‐stereotyped play. Children's (N = 212) gender category knowledge was assessed at 24 months and play was observed at 24 and 36 months. Higher levels of gender category knowledge and, more specifically, passing multiple measures of knowledge of both gender categories at 24 months was related to increases in play over time with gender‐stereotyped toys (doll, truck), but not gender‐stereotyped forms of play (nurturing, motion). In contrast to the long‐standing focus on self‐labeling, findings indicate the importance of intergroup cognitions in self‐socialization processes and demonstrate the generalizability of these processes to a diverse sample.     

Unpacking the Ontogeny of Gesture Understanding: How Movement Becomes Meaningful Across Development

Gestures, hand movements that accompany speech, affect children's learning, memory, and thinking (e.g., Goldin‐Meadow, 2003). However, it remains unknown how children distinguish gestures from other kinds of actions. In this study, 4‐ to 9‐year‐olds (n = 339) and adults (n = 50) described one of three scenes: (a) an actor moving objects, (b) an actor moving her hands in the presence of objects (but not touching them), or (c) an actor moving her hands in the absence of objects. Participants across all ages were equally able to identify actions on objects as goal directed, but the ability to identify empty‐handed movements as representational actions (i.e., as gestures) increased with age and was influenced by the presence of objects, especially in older children.     

Flexibility in Bilingual Infants' Word Learning

The present experiments tested bilingual infants' developmental narrowing for the interpretation of sounds that form words. These studies addressed how language specialization proceeds when the environment provides varied and divergent input. Experiment 1 (N = 32) demonstrated that bilingual 14‐ and 19‐month‐olds learned a pair of object labels consisting of the same syllable produced with distinct pitch contours (rising and falling). Infants' native languages did not use pitch contour to differentiate words. In Experiment 2 (N = 16), 22‐month‐old bilinguals failed to learn the labels. These results conflict with the developmental trajectory of monolinguals, who fail to learn pitch contour contrasts as labels at 17–19 months (Hay, Graf Estes, Wang, & Saffran, 2015). Bilingual infants exhibited a prolonged period of flexibility in their interpretation of potential word forms.     

Longitudinal Relations Among Positivity,Perceived Positive School Climate,and Prosocial Behavior in Colombian Adolescents

Bidirectional relations among adolescents’ positivity, perceived positive school climate, and prosocial behavior were examined in Colombian youth. Also, the role of a positive school climate in mediating the relation of positivity to prosocial behaviors was tested. Adolescents (N = 151; M_age of child in Wave 1 = 12.68, SD = 1.06; 58.9% male) and their parents (N = 127) provided data in two waves (9 months apart). A model of bidirectional relations between positivity and perceived positive school climate emerged. In addition, adolescents with higher levels of perceived positive school climate at age 12 showed higher levels of prosocial behaviors in the following year. Positive school climate related positivity to adolescents’ prosocial behavior over time.     

Infants Prefer Infant‐Directed Song Over Speech

In their everyday communication, parents do not only speak but also sing with their infants. However, it remains unclear whether infants' can discriminate speech from song or prefer one over the other. The present study examined the ability of 6‐ to 10‐month‐old infants (N = 66) from English‐speaking households in London, Ontario, Canada to discriminate between auditory stimuli of native Russian‐speaking and native English‐speaking mothers speaking or singing to their infants. Infants listened significantly longer to the sung stimuli compared to the spoken stimuli. This is the first study to demonstrate that, even in the absence of other multimodal cues, infant listeners are able to discriminate between sung and spoken stimuli, and furthermore, prefer to listen to sung stimuli over spoken stimuli.