The origins of moral sensitivities: Probing infants' expectations, evaluations, generalization, and enforcement of moral norms.

Identifying the origins of moral sensitivities, and their elaboration, within infancy and early childhood is a challenging task, given inherent limitations in infants' behavior. Here, I argue for a multi-pronged, multi-method approach that involves cleaving the moral response at its joints. Specifically, I chart the emergence of infants' moral expectations, evaluations, generalization and enforcement, demonstrating that while many moral sensitivities are present in the second year of life, these sensitivities are closely aligned with, and likely driven by, infants' everyday experience. Moreover, qualitative differences exist between the moral responses that are present in infancy and those of later childhood, particularly in terms of enforcement (i.e., a lack of punishment in infancy). These findings set the stage for addressing outstanding critical questions regarding moral development, that include identifying discrete causal inputs to early moral cognition, identifying whether moral cognition is distinct from social cognition early in life, and explaining gaps that exist between moral cognition and moral behavior in development.

Evaluations of aggressive chasing interactions by 7-month-old infants.

Recent theories of socio-moral development assume that humans evolved a capacity to evaluate others' social actions in different kinds of interactions. Prior infant studies found both reaching and visual preferences for the prosocial over the antisocial agents. However, whether the attribution of either positive or negative valence to agents' actions involved in an aggressive chasing interaction can be inferred by both reaching behaviors and visual attention deployment (i.e., disengagement of visual attention) is still an open question. Here we presented 7-month-old infants (N = 92) with events displaying an aggressive chasing interaction. By using preferential reaching and an attentional task (i.e., overlap paradigm), we assessed whether and how infants evaluate aggressive chasing interactions. The results demonstrated that young infants prefer to reach the victim over the aggressor, but neither agent affects visual attention. Moreover, such reaching preferences emerged only when dynamic cues and emotional face-like features were congruent with agents' social roles. Overall, these findings suggested that infants' evaluations of aggressive interactions are based on infants' sensitivity to some kinematic cues that characterized agents' actions and, especially, to the congruency between such motions and the face-like emotional expressions of the agents.

The haves and have-nots: Infants use wealth to guide social behavior and evaluation.

Biases favoring the wealthy are ubiquitous, and they support and bolster vast resource inequalities across individuals and groups; yet, when these biases are acquired remains unknown. In Experiments 1 through 5 (Total N = 232), using multiple methods, we found that 14- to 18-month-old infants track individuals' wealth (Experiments 1-5), prefer and selectively help rich (vs. poor) individuals (Experiments 2 and 3), and negatively evaluate poor individuals (Experiments 4 and 5). In two subsequent experiments with 11- to 13-month-old infants (Total N = 65), however, we find no evidence of preferences for rich (vs. poor) individuals (Experiment 6) or differential evaluations of rich and poor people (Experiment 7). Together, these results demonstrate that in the second year of life, wealth emerges as a central and robust dimension of evaluation that guides social decision making. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Exploring the impact of parents' face-mask wearing on dyadic interactions in infants at higher likelihood for autism compared with general population.

Since the COVID-19 pandemic, both the public and researchers have raised questions regarding the potential impact of protective face-mask wearing on infants' development. Nevertheless, limited research has tested infants' response to protective face-mask wearing adults in real-life interactions and in neurodiverse populations. In addition, scarce attention was given to changes in interactive behavior of adults wearing a protective face-mask. The aims of the current study were (1) to examine differences in 12-month-old infants' behavioral response to an interactive parent wearing a protective face-mask during face-to-face interaction, (2) to investigate potential differences in infants at higher likelihood for autism (HL-ASD) as compared with general population (GP) counterparts, and (3) to explore significant differences in parents' behaviors while wearing or not wearing a protective face-mask. A total of 50 mother-infant dyads, consisting of 20 HL-ASD infants (siblings of individuals with autism) and 30 GP infants, participated in a 6-min face-to-face interaction. The interaction was videotaped through teleconferencing and comprised three 2-min episodes: (a) no mask, (b) mask, and (c) post-mask. Infants' emotionality and gaze direction, as well as mothers' vocal production and touching behaviors, were coded micro-analytically. Globally, GP infants exhibited more positive emotionality compared with their HL-ASD counterparts. Infants' negative emotionality and gaze avoidance did not differ statistically across episodes. Both groups of infants displayed a significant increase in looking time toward the caregiver during the mask episode. No statistically significant differences emerged in mothers' behaviors. These findings suggest that the use of protective face-masks might not negatively affect core dimensions of caregiver-infant interactions in GP and HL-ASD 12-month-old infants.

Soothing and Distress Behaviors of Infants, Parents, and Clinicians During Childhood Vaccinations.

OBJECTIVES: The purpose of this study was to describe the behaviors of infants who were born preterm, their parents, and clinicians during 2-, 6-, 12-, and 18-month vaccinations. METHODS: Vaccination sessions were video recorded for 3-5 minutes. The proportion of 5-second intervals in which distress and soothing behavior by infants, parents, and clinicians was coded using the Measure of Adult and Infant Soothing and Distress. Coding consisted of three phases: baseline/anticipatory (60 seconds prior to first needle), procedure (first needle to removal of final needle), and recovery (up to 180 seconds after removal of final needle). RESULTS: A total of 64 infants were included. Distress behavior by infants during the baseline phase ranged from 13% (12-month vaccinations) to 29% (2-month). There was limited anticipatory soothing behavior from parents (10% [12-month] to 50% [2-month]) and clinicians (6% [12-month] to 17% [2-month]). Distress behavior in infants during the procedure ranged from 43% (18-month) to 96% (2-month). There was limited soothing behavior during the procedure from parents (10% [12-month] to 81% [12-month]) and clinicians (13% [12-month] to 71% [2-month]). Few infants received additional pain-reducing interventions, including skin-to-skin contact, 24% oral sucrose, and topical anesthetic. DISCUSSION: Despite infant distress, there was limited anticipatory behavior from parents and clinicians. Two-month-old infants displayed the most distress across all time points yet received the least amount of treatment and proximal parent and clinician behavior. Additional implementation efforts are required to increase awareness and practice uptake among parents and clinicians to ensure infants receive equitable and effective pain management.

Effect of Routine Nurse Caregiving on the Stress Responses and Behavior State in Preterm Infants: A Systematic Review.

BACKGROUND: Although routine nurse caregiving is vital for the overall health of preterm infants, variations in approaches may exert distinct effects on preterm infants' stress responses and behavior state. PURPOSE: The purpose of this systematic review was to examine routine nurse caregiving in the neonatal intensive care unit and its effect on stress responses and behavior state in preterm infants. DATA SOURCES: A systematic search was conducted using PubMed, Embase, and CINAHL for studies published between 2013 and 2023. STUDY SELECTION: Included studies enrolled preterm infants born <37 weeks gestational age and investigated nurse caregiving practices and effects on stress responses and/or behavior state. DATA EXTRACTION: Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, data about study design, methods, findings, and limitations were extracted and summarized. Included studies were evaluated for bias using the National Health, Lung, and Blood Institute quality assessment tools. RESULTS: All 13 studies included in the review received a fair quality rating. Nurse caregiving activities, including suctioning, diaper changes, bathing, and weighing, were associated with increases in heart and respiratory rates, blood pressure, energy expenditure, and motor responses, lower oxygen saturations, and fewer sleep states. IMPLICATIONS FOR PRACTICE AND RESEARCH: Adapting nurse caregiving frequency and duration, aligning caregiving with infant state, and integrating developmental care strategies may reduce infant stress responses and support behavioral rest. Further research is needed to understand how caregiving activities affect stress responses and behavior state in preterm infants, aiding in identifying modifiable caregiving stressors to promote optimal development.

Maternal Perceptions and Responsiveness to Cry in Armed Conflict Zones: Links to Child Behavior Problems.

Crying is a typical infant behavior that activates parental caregiving behaviors, acting as "human alarms" important for the infant's survival. When living under war-related threat, the auditory system may be sensitized given its importance for survival, potentially impacting maternal cry processing. Children living in armed-conflict zones are at increased risk for behavior problems, which may relate to both direct exposure and indirect effects through their parents' perceptions and behaviors. This hypothesis was examined in a sample of mothers and their first-born children (aged 10-45 months) living in the Gaza vicinity area in Israel, chronically exposed to missile alarms (high-exposure; n = 45), and a comparison group (low-exposure; n = 86). Group differences in child behavior problems and maternal perceptions of and responsiveness to cry were investigated. A moderated indirect-effect of maternal cry perceptions on child behavior problems via maternal responsiveness to cry was examined. In the high-exposure group, children had more externalizing problems and mothers rated cries as more aversive. Maternal cry perception was indirectly related to child behavior problems via responsiveness to cry only in the high-exposure group: higher perceptions of cry as aversive or the child as distressed were related to faster responding to crying, and faster cry responsiveness was linked with fewer behavior problems. Results suggest that in armed-conflict zones with auditory warning signals, the parental caring system may be easily activated by cries due to the strong association between alarms and threat. Furthermore, children may need their mothers to react faster when feeling distressed, possibly because of the surrounding threat.

Infant embodied requests and teacher-practitioner offers during early childhood education mealtimes.

The importance of building healthy relationships with food in children's early years is of paramount importance. Building on prior work exploring the social and linguistic practices in infant eating interaction experiences, this research uses a multimodal conversation analysis approach to explore how mealtime interactions are managed as a co-constructed activity between infants (0-2 years) and early childhood teacher-practitioners. Here we will explore video data recorded during mealtimes in an early childhood setting in Mid-Wales, where infants orient to recruitments for assistance and teachers provide offers of help with food items throughout the data. Analysis demonstrates 1) infant recruitment of help through embodied 'showing' an item causing a problem in multimodal ways, initiating joint attention that mobilises an offer from an adult in the shape of 'do you want me to X' and 2) adult initiation of an offer of help in the shape of 'would you like me to X' that are not prompted by infants 'showing' an item. Such practices demonstrate infant social competence in recruiting assistance through multimodal resources, and adult's noticings that help is required and their initiation of provision of assistance. The detailed exploration into the ways in which mealtimes are a collaboratively achieved experience reveals how infants effectively contribute in resourceful ways, and how teacher-practitioner responses frame mealtimes as co-produced activities.

Emergence of locomotor behaviors: Associations with infant characteristics, developmental status, parental beliefs, and practices in typically developing Brazilian infants aged 5 to 15 months.

Independent locomotion provides autonomy for infants, drastically changing their relationship with their surroundings. From a dynamic systems perspective, the interaction between environment, tasks, and organismic constraints leads to the emergence of new behaviors over time. This 6-month longitudinal study aimed to verify associations between the emergence of locomotor behaviors and infants' characteristics, developmental status, parental beliefs, and practices. This observational study remotely assessed 37 full-term Brazilian infants aged 5 to 15 months, divided into two groups (G1: 5 to 11 months, n = 19; and G2: 9 to 15 months, n = 18). The motor developmental status of infants was closely associated with the emergence of behaviors (p < 0.05). Infants in G2 whose parents agreed with the statement "In typically developing infants, motor development occurs naturally and there is no need to actively stimulate it" started to walk later than those whose parents disagreed. Infants whose parents expected them to walk around 10-11 months walked earlier compared to those expected to walk after 11 months (G2, p = 0.011). Infants in G2 with a high frequency of staying in the supine position started to walk, both with and without support, later than those with a low frequency (p < 0.05). For infants in G1 with a high frequency of playing on the floor, locomotion (p = 0.041) and crawling on hands-and-knees (p = 0.007) started sooner compared to those with a low frequency. Staying in the cradle more frequently was related to a later emergence of supported walk (p = 0.046) among infants in G2. The emergence of locomotor behaviors is associated with motor developmental status, the surfaces where the infant plays, and body position. Parental beliefs and expectations influence how infants are stimulated and, consequently, the emergence of independent walking.

Mother-infant interaction characteristics associate with infant falling reactivity and child peer problems at pre-school age.

This longitudinal study investigated the associations between mother-infant interaction characteristics at 9 months of age, maternal mental health, infant temperament in the first year postpartum, and child behaviour at 3 years of age. The infants (N = 54, 22 females) mainly had White British ethnic backgrounds (85.7%). Results showed that i) mother-infant dyadic affective mutuality positively correlated with infant falling reactivity, suggesting that better infant regulatory skills are associated with the dyad's ability to share and understand each other's emotions; and ii) maternal respect for infant autonomy predicted fewer child peer problems at 3 years of age, suggesting that maternal respect for the validity of the infant's individuality promotes better social and emotional development in early childhood.

What we don't know about what babies know: Reconsidering psychophysics, exploration, and infant behavior.

Researchers must infer "what babies know" based on what babies do. Thus, to maximize information from doing, researchers should use tasks and tools that capture the richness of infants' behaviors. We clarify Gibson's views about the richness of infants' behavior and their exploration in the service of guiding action - what Gibson called "learning about affordances."

Postnatal nighttime light exposure and infant temperament at age 12 months: mediating role of genus Akkermansia.

The gut microbiome has been reported to be associated with nighttime light (NTL) exposure and temperament. However, the specific role of infant gut microbiome plays in NTL exposure and temperament is unclear. This study investigated the potential mediating role of infants' gut microbiome in correlations between NTL exposure and temperament. Demographic information, stool samples, and temperament scores were collected from 40 infants. Temperament was evaluated using the Infants Behavior Questionnaire-Revised (IBQ-R). The gut microbiota was analyzed using 16S rRNA sequencing. Cumulative and lagged effects of NTL exposure were calculated based on residential address (NTLpoint) and a concentric 1 km radius buffer zone around the address (NTL1000m), respectively. Mediation models were utilized for assessing the mediating effects of the gut microbiome. The gut microbiome of infants with higher fear scores was characterized by a higher abundance of Akkermansia and Clostridium_sensu_stricto_1 and a lower abundance of Bacteroides. Mediation models indicated Akkermansia played a full mediating role in associations between NTLpoint, NTL1000m and fear in specific time periods. Genus Akkermansia explained 24.46% and 33.50% of associations between fear and cumulative exposure to NTLpoint and NTL1000m, respectively. This study provides evidence for the mediating role of Akkermansia between NTL exposure and fear. However, further experimental is required to elucidate the mechanisms through which the gut microbiome mediates between NTL exposure and temperament in infants.

Stress and self-regulation behaviors in preterm neonates hospitalized at open-bay and single-family room Neonatal Intensive Care Unit.

The Neonatal Intensive Care Unit (NICU) could be a risk factor for the development of preterm neonates due to the stressful procedures they undergo. Stress-related behaviors must be managed through environmental strategies that support regulating the neonates' biobehavioural system to minimize the negative impact on their development. The study aimed to compare the NICU environment's stressful procedures and developmental care strategies and the stress and self-regulation behaviors of preterm neonates in groups differentiated by the NICU environmental design. The sample comprised 20 preterm neonates hospitalized in a NICU with an open-bay model (OB NICU) and 20 preterm neonates hospitalized in a single-family room model (SFR NICU). The stressful procedures were assessed by the Neonatal Infant Stressor Scale (NISS). The developmental care strategies and the preterm neonates' stress and self-regulation behaviors were assessed using a structured observational protocol. The between-group comparison was performed by the Mann-Whitney test, and the significance level was set at 5%. Both NICUs had similar stressful procedures and developmental care approaches. However, the preterm neonates hospitalized in the SFR NICU exhibited significantly fewer total stress behaviors, and specifically in the motor system, compared to those in the OB NICU. Additionally, the preterm neonates hospitalized in the SFR NICU exhibited significantly more total self-regulation behaviors, and specifically in the behavioral state system, compared to those in the OB NICU. The findings showed that the single-family room NICU model was consistent with the environmental protection of biobehavioural regulation in preterm neonates hospitalized in the NICU.

Relationship between maternal anxiety and infants' temperament: The mediating role of mindful parenting.

Research has indicated that maternal anxiety does have an effect on infant temperament. Therefore, it is important to study the variables that could play a role in this relationship. In this study, we propose that mindful parenting could act as a mediator in this relationship. Thus, the main objective was to evaluate the relationship between maternal anxiety and child temperament (i.e., negative affectivity, surgency, and effortful control) through the mindful parenting of mothers. Mothers (N = 225) self-reported their anxiety, mindful parenting use, and the temperament of their old infants (aged 4-18 months). First, the reliability and validity results showed that the infant version of the Interpersonal Mindful Parenting questionnaire was a good tool for the assessment of mindful parenting among parents with infants. The five-factor structure of the questionnaire was confirmed; it involved self-regulation in the parenting relationship, listening with full attention, emotional awareness of the child, compassion for the child, and non-judgmental acceptance of parenting behavior. Correlational analyses showed that maternal anxiety was related to negative affectivity and effortful control in infants. Furthermore, mediational analyses indicated that the relation between maternal anxiety and infant negative affectivity was mediated by self-regulation in parenting and the emotional awareness of the child. In addition, the relation between maternal anxiety and infant effortful control was mediated by compassion for the child and listening with full attention. These results contribute to knowledge about the relation between maternal anxiety and child temperament, which may increase the risk of psychological symptoms. The results of this study suggest that promoting mindful parenting skills may be beneficial for affectivity and effortful control in infants.

It's You and Me: Infants' cross-modal communicative signals and mother-infant interactive behavior predict infant regulatory patterns in the still-face paradigm at 3 months.

Infant regulatory behavior develops since birth and impacts their early social interactions. Infants differ in the relative coherence and incoherence of their cross-modal communicative signals during en-face infant-caregiver interactions. We expand this research by evaluating whether different infant regulatory patterns observed during the Face-to-Face Still-Face (FFSF) at 3 months are associated with the coherence or incoherence of infants' cross-modal communicative behaviors during en-face interactions or with multiple dimensions of mother-infant interactive behavior during free-play. Analyses were based on data collected from 100 mother-infant dyads from urban, working- and middle-class backgrounds in Portugal who were videotaped during the FFSF and free play at 3 months. Results confirm that infants' different regulatory behavior patterns in the FFSF at 3 months are associated with the coherence and incoherence of their cross-modal interactive behaviors and specific aspects of mother-infant interaction. Infants with a Social-Positive oriented regulatory pattern during the FFSF displayed more coherent and less incoherent communicative behaviors with their mothers and were more cooperative during free play. In turn, their mothers were more sensitive. Our findings support the perspective that infants' regulatory behavior strategies in the context of caregiver regulatory support and sensitivity are likely to increase dyadic correspondence and infant ability to engage with the world.

Building language learning: Relations between infant attention and social contingency in the first year of life.

In Western societies, social contingency, or prompt and meaningful back-and-forth exchanges between infant and caregiver, is a powerful feature of the early language environment. Research suggests that infants with better attentional skills engage in more social contingency during interactions with adults and, in turn, social contingency supports infant attention. This reciprocity is theorized to build infant language skills as the adult capitalizes on and extends the infant's attention during socially contingent interactions. Using data from 104 infants and caregivers, this paper tests reciprocal relations between infant attention and social contingency at 6- and 12-months and the implications for infant vocabulary at 18-months. Infant attentional skills to social (women speaking) and nonsocial (objects dropping) events were assessed, and social contingency was examined during an 8-minute toy play interaction with a caregiver. Child receptive and expressive vocabulary was measured by caregiver-report. Both social and nonsocial attentional skills related to engagement in social contingency during caregiver-infant interaction, though only models that included social attention and social contingency predicted vocabulary. These findings provide empirical evidence for the proposed reciprocal relations between infant attention and social contingency as well as how they relate to later language.

Let's make music as we normally do: A systematic review of how early natural musical interactions between infant and caregiver have been studied in research.

Musical interactions between babies and their primary caregivers are very frequent during the early years of life and their impact on dyadic interaction and infants' development has garnered significant attention in recent literature. However, the difficulties that natural observations entail have meant that research often carries out methodological manipulations that have a significant impact on the phenomenon studied. In order to clarify how to investigate best natural musical interactions and the information that these can provide, we have carried out a systematic review to analyze the proposed scenarios and the variables analyzed in the studies published on such interactions between main caregivers and babies under three years old. We have screened 971 articles and yielded 27. We have found a higher prevalence in the literature of studies on singing interactions, between mothers and babies under 12 months of age. We have also been able to identify two extremes in terms of methodological structuring of natural interactions. Regarding the analysis variables, a few behaviors are repeated throughout the studies, being emotions, rhythmic behaviors and characterizations of the vocal emissions common between parents and babies. Synchrony is the dyadic variable with the most weight and also one of the preferred focuses of interest in the most recent literature that has undergone a shift of focus from characterization of musical interactions to the search for the mechanisms that underlie and make them specific.

Infant carrying: Associations with parental reflective functioning, parental bonding and parental responses to infant crying.

Infant carrying may have beneficial effects on the parent-infant relationship but only limited research has been conducted in this area. Therefore, the main aim of the current study was to investigate whether infant carrying is associated with parental reflective functioning, parental bonding, and parental (emotional) and behavioral responses to infant crying, key elements within the parent-infant relationship, promoting infant development. Parents reporting high levels (N = 389) of infant carrying (six times a week or daily) and parents reporting low levels (N = 128) of infant carrying (less than once a week or not at all) who participated in an online survey about the developing parent-infant relationship in Germany were included in the present study. Standardized questionnaires were used to assess parental reflective functioning, parental bonding impairments, and emotional responses to infant crying. Further insensitive (non-responsive and hostile) behaviors in response to infant crying were assessed. Parents with high levels of infant carrying showed better parental reflective functioning, lower parental bonding problems, less negative emotions, and less insensitive behaviors in response to infant crying.

Cargar al infante pudiera tener efectos beneficiosos para la relación progenitor­infante, pero sólo una limitada investigación se ha llevado a cabo en esta área. Por tanto, el objetivo principal del presente estudio fue investigar si cargar al infante se asocia con que el funcionamiento con reflexión del progenitor, los lazos de afectividad del progenitor, así como las respuestas de comportamiento (emocional) del progenitor al llanto del infante, elementos claves dentro de la relación progenitor­infante, promueven el desarrollo del infante. Se incluyó en el presente estudio a los progenitores que reportaron altos niveles (N=389) de llanto del infante (seis veces por semana o diariamente) y a los progenitores que reportaron bajos niveles (N=128) del llanto del infante (menos de una vez por semana o nunca), quienes participaron en una encuesta electrónica acerca de la relación progenitor­infante en desarrollo, en Alemania. Se usaron cuestionarios estandarizados para evaluar el funcionamiento con reflexión del progenitor, los impedimentos de lazos afectivos del progenitor, así como las respuestas emocionales al llanto del infante. Se evaluaron además comportamientos insensibles (sin respuesta afectiva y hostil) como respuesta al llanto del infante. Los progenitores con altos niveles de cargar al infante demostraron un mejor funcionamiento con reflexión del progenitor, más bajos problemas en cuanto a lazos de afectividad del progenitor, menos emociones negativas y menos comportamientos insensibles como respuesta al llanto del infante.

Porter un bébé peut avoir des effets bénéfiques sur la relation parent­bébé mais il n'existe que peu de recherches sur ce domaine. C'est pour cette raison que le but principal de cette étude était d'investiguer si le fait de porter un bébé est lié avec une fonction réflexive parentale, le lien parental et les réactions parentales (émotionnelles) et comportementales aux pleurs du bébé, des éléments clef au sein de la relation parent­bébé, promouvant le développement du bébé. Les parents faisant état de niveaux élevés (N=389) de portage du bébé (six fois par semaine ou tous les jours) et les parents faisant état de niveaux bas (N=128) de portage du bébé (moins d'une semaine ou pas du tout) qui ont participé à un questionnaire en ligne sur la relation parent­bébé se développant en Allemagne ont été inclus dans cette étude. Des questionnaires standardisés ont été utilisés afin d'évaluer la fonction réflexive parentale, les troubles du lien parental, et les réactions émotionnelles aux pleurs du bébé. D'autres comportement insensibles (non­réactifs et hostile) en réaction aux pleurs du bébé ont été évalués. Les parents avec des niveaux élevés de portage du bébé ont fait preuve d'une meilleure fonction réflexive parentale, de moins de problèmes de lien parental, de moins d'émotions négatives, et de moins de comportements insensibles en réaction aux pleurs du bébé.

Infant emotion regulation in the context of stress: Effects of heart rate variability and temperament.

Stressful events are inherently emotional. As a result, the ability to regulate emotions is critical in responding effectively to stressors. Differential abilities in the management of stress appear very early in life, compelling a need to better understand factors that may shape the capacity for emotion regulation (ER). Variations in both biologic and behavioural characteristics are thought to influence individual differences in ER development. We sought to determine the differential contributions of temperament and heart rate variability (HRV; an indicator of autonomic nervous system function) to infant resting state emotionality and emotional reactivity in response to a stressor at 6 months of age. Participants included 108 mother-infant dyads. Mothers completed a measure of infant temperament at 6 months postnatal. Mother and infant also participated in a standardized stressor (the Repeated Still Face Paradigm) at that time. Electrocardiographic data were acquired from the infant during a baseline resting state and throughout the stressor. Fast Fourier Transformation was used to analyse the high frequency (HF) domain of HRV, a measure of parasympathetic nervous system activity. Infant ER was measured via standardized coding of emotional distress behaviours from video-records at baseline and throughout the stressor. Severity of mothers' depressive symptoms was included as a covariate in analyses. Results of linear regression indicate that neither temperament nor HRV were associated significantly with an infant's emotional resting state, although a small effect size was found for the relationship between infant negative affectivity and greater emotional distress (ß = 0.23, p = 0.08) prior to the stressor. Higher HF-HRV (suggesting parasympathetic dominance) was related to greater emotional distress in response to the stressor (ß = 0.34, p = 0.009). This greater emotional reactivity may reflect a more robust capacity to mount an emotional response to the stressor when infants encounter it from a bedrock of parasympathetic activation. Findings may inform eventual markers for assessment of ER in infancy and areas for intervention to enhance infant management of emotions, especially during stressful events.

Mother-infant self- and interactive contingency at four months and infant cognition at one year: A view from microanalysis.

Although a considerable literature documents associations between early mother-infant interaction and cognitive outcomes in the first years of life, few studies examine the contributions of contingently coordinated mother-infant interaction to infant cognitive development. This study examined associations between the temporal dynamics of the contingent coordination of mother-infant face-to-face interaction at 4 months and cognitive performance on the Bayley Scales of Infant Development at age one year in a sample of (N = 100) Latina mother-infant pairs. Split-screen videotaped interactions were coded on a one second time base for the communication modalities of infant and mother gaze and facial affect, infant vocal affect, and mother touch. Multi-level time-series models evaluated self- and interactive contingent processes in these modalities and revealed 4-month patterns of interaction associated with higher one-year cognitive performance, not identified in prior studies. Infant and mother self-contingency, the moment-to-moment probability that the individual's prior behavior predicts the individual's future behavior, was the most robust measure associated with infant cognitive performance. Self-contingency findings showed that more varying infant behavior was optimal for higher infant cognitive performance, namely, greater modulation of negative affect; more stable maternal behavior was optimal for higher infant cognitive performance, namely, greater likelihood of sustaining positive facial affect. Although interactive contingency findings were sparse, they showed that, when mothers looked away, or dampened their faces to interest or mild negative facial affect, infants with higher 12-month cognitive performance were less likely to show negative vocal affect. We suggest that infant ability to modulate negative affect, and maternal ability to sustain positive affect, may be mutually reinforcing, together creating a dyadic climate that is associated with more optimal infant cognitive development.