Influences of oxytocin and respiratory sinus arrhythmia on emotions and social behavior in daily life

Cardiac autonomic regulation as a proxy of early neurodevelopment: A systematic review

BACKGROUND

Cardiac autonomic regulation and early neurodevelopment are linked, but research has focused largely on specific domains, such as attention and memory, neglecting broad neurodevelopmental outcomes. The use of diverse study populations and methodologies further hinders interpretation, highlighting the need for more consistent, integrative research in this area. Therefore, the aim of this study was to clarify how cardiac autonomic regulation (as quantified by heart rate indices) is associated with global neurodevelopment in infancy through a systematic literature review.

METHOD

A systematic literature search was carried out in the Scopus, PubMed, Web of Science, and ProQuest databases for studies published between January 1980 and December 2022. The search terms were a combination of words that included elements from three categories: 1) cardiac vagal regulation, 2) neurodevelopment indicators, and 3) population (neonate/infant).

RESULTS

Five studies involving 933 infants (48 % of whom were girls) and baseline evaluations from birth to 26 weeks of age were included. The findings were mixed: while some studies identified positive associations between parasympathetic activity and neurodevelopmental outcomes, others reported nonsignificant or inconsistent associations. The variability in study designs, measurement methods, and population characteristics likely contributed to these discrepancies. However, respiratory sinus arrhythmia (RSA) was the most commonly used indicator, and the highest percentage of studies reported significant associations between neurodevelopment and autonomous functioning (RSA = 83 %, heart rate variability = 69 %), particularly when controlling for factors such as age and birthweight.

CONCLUSIONS

Although autonomic regulation during the first years of life appears to be associated with neurodevelopment, the evidence is not entirely consistent across all heart rate indices or developmental domains. Further research is needed to better understand these relationships, particularly in light of the methodological differences and potential confounding factors. Recognizing individual differences in autonomic nervous system regulation could provide valuable insights into neurodevelopmental trajectories.

Elevated unanticipated acoustic startle reactivity in dyslexia

People with dyslexia, a neurodevelopmental disorder of reading, are highly attuned to the emotional world. Compared with their typically developing peers, children with dyslexia exhibit greater autonomic nervous system reactivity and facial behaviour to emotion- and empathy-inducing film clips. Affective symptoms, such as anxiety, are also more common in children with dyslexia than in those without. Here, we investigated whether the startle response, an automatic reaction that lies at the interface of emotion and reflex, is elevated in dyslexia. We measured facial behaviour, electrodermal reactivity (a sympathetic nervous system measure) and emotional experience in response to a 100 ms, 105 dB unanticipated acoustic startle task in 30 children with dyslexia and 20 comparison children without dyslexia (aged 7-13) who were matched on age, sex and nonverbal reasoning. Our results indicated that the children with dyslexia had greater total facial behaviour and electrodermal reactivity to the acoustic startle task than the children without dyslexia. Across the sample, greater electrodermal reactivity during the startle predicted greater parent-reported anxiety symptoms. These findings contribute to an emerging picture of heightened emotional reactivity in dyslexia and suggest accentuated sympathetic nervous system reactivity may contribute to the elevated anxiety that is often seen in this population.

Interparental Positivity Spillover Theory: How Parents' Positive Relational Interactions Influence Children

Interparental interactions have an important influence on child well-being and development. Yet prior theory and research have primarily focused on interparental conflict as contributing to child maladjustment, which leaves out the critical question of how interparental positive interactions-such as expressed gratitude, capitalization, and shared laughter-may benefit child growth and development. In this article, we integrate theory and research in family, relationship, and affective science to propose a new framework for understanding how the heretofore underexamined positive interparental interactions influence children: interparental positivity spillover theory (IPST). IPST proposes that, distinct from the influence of conflict, interparental positive interactions spill over into children's experiences in the form of their (a) experience of positive emotions, (b) beneficially altered perceptions of their parents, and (c) emulation of their parents' positive interpersonal behaviors. This spillover is theorized to promote beneficial cognitive, behavioral, social, and physiological outcomes in children in the short term (i.e., immediately after a specific episode of interparental positivity, or on a given day) as well as cumulatively across time. As a framework, IPST generates a host of novel and testable predictions to guide future research, all of which have important implications for the mental health, well-being, and positive development of children and families.

Advances in human oxytocin measurement: challenges and proposed solutions

Oxytocin, a neuropeptide known for its role in reproduction and socioemotional processes, may hold promise as a therapeutic agent in treating social impairments in patient populations. However, research has yet to uncover precisely how to manipulate this system for clinical benefit. Moreover, inconsistent use of standardized and validated oxytocin measurement methodologies-including the design and study of hormone secretion and biochemical assays-present unresolved challenges. Human studies measuring peripheral (i.e., in plasma, saliva, or urine) or central (i.e., in cerebrospinal fluid) oxytocin concentrations have involved very diverse methods, including the use of different assay techniques, further compounding this problem. In the present review, we describe the scientific value in measuring human endogenous oxytocin concentrations, common issues in biochemical analysis and study design that researchers face when doing so, and our recommendations for improving studies using valid and reliable methodologies.

Resting respiratory sinus arrhythmia is related to emotion reactivity to social-evaluative stress

BACKGROUND

Higher resting parasympathetic nervous system activity, as indexed by respiratory sinus arrhythmia (RSA), has been considered a marker of emotion regulatory capacity and is consistently related to better mental health. However, it remains unclear how resting RSA relates to emotion reactivity to acute social-evaluative stress, a potent predictor of depression and other negative outcomes.

METHOD

A sample of 89 participants (Mage = 18.36, SD = 0.51; 58.43 % female) provided measures of RSA at rest and then completed the Trier Social Stress Test, a standardized laboratory-based social-evaluative stress task that involves public speaking and mental arithmetic while being evaluated by two confederate judges. Participants reported a variety of emotions (e.g., negative emotion, positive emotion) at baseline and immediately after the stress task.

RESULTS

Participants with higher resting RSA showed greater increases in negative emotion, guilt, depressive emotion, and anger, as well as greater decreases in positive emotion after the task.

LIMITATION

Data were limited to a relatively small sample of late adolescents, who may be particularly responsive to social-evaluative stress compared to adults.

CONCLUSIONS

Findings suggest that higher resting RSA may enhance emotion responses to social-evaluative stress in adolescents, potentially due to active engagement and responding to rather than passively viewing stimuli. Higher resting RSA may promote flexible emotion responses to the social environment, which may account for associations between higher RSA and better mental health.

Translating core intervention strategies into action: Interpersonal validation among self-injuring adolescents and their mothers

INTRODUCTION

Most evidence-supported treatments for psychiatric problems teach clients skills to incorporate into their daily lives. Yet little research rigorously examines the extent to which individuals absorb these strategies and can competently apply them outside of the therapeutic relationship.

OBJECTIVES

The current study examined the degree to which self-injuring adolescents and their mothers (n = 30 dyads) and typical control mother-daughter dyads (n = 30) were able to utilize a multicomponent interpersonal validation-oriented skill from dialectical behavior therapy, after a single teaching. We also aimed to assess whether variance in Gentle, Interested, Validate, and Easy (GIVE) skill practice was associated with a physiological index of emotion regulation (respiratory sinus arrhythmia [RSA]).

METHOD

An observational coding system was developed to measure skill-related behavior across four key domains (be[ing] gentle, act[ing] interested, validation, and us[ing] an easy manner; GIVE) and applied during two family conflict discussions (pre- and postskills training). Mother and adolescent RSA data were collected at rest and across discussion tasks.

RESULTS

Behavioral indicators of skill use improved pre-to-post skills training across the entire sample, except in one GIVE domain (easy manner). Self-injuring youth and their mothers demonstrated greater improvements than control dyads with respect to being gentle. RSA reactivity scores predicted behavioral validation, such that higher RSA was associated with higher validation scores.

CONCLUSIONS

As a field, we currently have a limited understanding of how intervention skills are used, and what factors predict effective skill application. Results suggest self-injuring adolescents and their mothers can learn and improve on most aspects of a core intervention strategy after a single teaching and that better physiological regulation during conflict is associated with more validating behaviors.

Children with developmental dyslexia show elevated parasympathetic nervous system activity at rest and greater cardiac deceleration during an empathy task

Reading difficulties are the hallmark feature of dyslexia, but less is known about other areas of functioning. Previously, we found children with dyslexia exhibited heightened emotional reactivity, which correlated with better social skills. Whether emotional differences in dyslexia extend to the parasympathetic nervous system-an autonomic branch critical for attention, social engagement, and empathy-is unknown. Here, we measured autonomic nervous system activity in 24 children with dyslexia and 24 children without dyslexia, aged 7 - 12, at rest and during a film-based empathy task. At rest, children with dyslexia had higher respiratory sinus arrhythmia (RSA) than those without dyslexia. Cardiac deceleration during the empathy task was greater in dyslexia and correlated with higher resting RSA across the sample. Children with dyslexia produced more facial expressions of concentration during film-viewing, suggesting greater engagement. These results suggest elevated resting parasympathetic activity and accentuated autonomic and behavioral responding to others' emotions in dyslexia.

Being moved by listening to unfamiliar sad music induces reward-related hormonal changes in empathic listeners

Many people enjoy sad music, and the appeal for tragedy is widespread among the consumers of film and literature. The underlying mechanisms of such aesthetic experiences are not well understood. We tested whether pleasure induced by sad, unfamiliar instrumental music is explained with a homeostatic or a reward theory, each of which is associated with opposite patterns of changes in the key hormones. Sixty-two women listened to sad music (or nothing) while serum was collected for subsequent measurement of prolactin (PRL) and oxytocin (OT) and stress marker (cortisol and adrenocorticotropic hormone) concentrations. Two groups of participants were recruited on the basis of low and high trait empathy. In the high empathy group, PRL and OT levels were significantly lower with music compared with no music. And compared to the low empathy group, the high empathy individuals reported an increase of positive mood and higher ratings of being moved with music. None of the stress markers showed any changes across the conditions or the groups. These hormonal changes, inconsistent with the homeostatic theory proposed by Huron, exhibit a pattern expected of general reward. Our findings illuminate how unfamiliar and low arousal music may give rise to pleasurable experiences.

Oxytocin, cortisol, and cognitive control during acute and naturalistic stress

Although stress is a strong risk factor for poor health, especially for women, it remains unclear how stress affects the key neurohormones cortisol and oxytocin, which influence stress-related risk and resilience. Whereas cortisol mediates energy mobilization during stress, oxytocin has anti-inflammatory, anxiolytic, and analgesic effects that support social connection and survival across the lifespan. However, how these neurohormones interrelate and are associated with cognitive control of emotional information during stress remains unclear. To address these issues, we recruited 37 college-aged women (M_age = 19.19, SD = 1.58) and randomly assigned each to a one-hour experimental session consisting of either an acute stress (emotionally stressful video) or control (non-stressful video) condition in a cross-sectional manner across the semester. Salivary cortisol and oxytocin samples were collected at baseline and after the video, at which point participants also completed measures assessing affect and an emotional Stroop task. As hypothesized, the emotional stressor induced negative emotions that were associated with significant elevations in cortisol and faster Stroop reaction times. Moreover, higher baseline oxytocin predicted greater positive affect after the stressor and also better cognitive accuracy on the Stroop. Analyses examining the naturalistic stress effects revealed that basal oxytocin levels rose steeply three weeks before the semester's end, followed by rising cortisol levels one week later, with both neurohormones remaining elevated through the very stressful final exam period. Considered together, these data suggest that women's collective experiences of stress may be potentially buffered by a synchronous oxytocin surge that enhances cognitive accuracy and reduces stress "when the going gets tough".

Conscientiousness and perceived physical symptoms: Mediating effect of life events stress and moderating role of resting respiratory sinus arrhythmia

This study investigated the possible psychophysiological links between conscientiousness and perceived physical symptoms by examining the mediating role of life events stress and the moderating role of resting respiratory sinus arrhythmia (RSA). Participants participated in the collection of questionnaire data and physiological data (N = 396). Results showed life events stress mediated the association between conscientiousness and perceived physical symptoms, and the indirect effect was only significant among individuals with lower resting RSA. Findings indicate that low resting RSA as a risk-amplifying physiological marker may magnify the relationship that low conscientiousness affects physical symptoms by increasing life events stress.

A new micro-intervention to increase the enjoyment and continued practice of meditation

New health behaviors are difficult to maintain and meditation is no different. We tested two key pathways of the upward spiral theory of lifestyle change (Fredrickson, 2013), which identifies positive emotions as critical ingredients for the maintenance of new health behaviors. The present experiment combined a laboratory session that introduced novices to meditation with a 3-week follow-up period to assess the extent to which study participants maintained this new health behavior. In a 2 × 2 experimental design, midlife adults (N = 240) were randomized to (a) learn about judicious ways to prioritize positivity (labeled "prioritizing positivity plus") or about a control topic that also featured the science of positive emotions and (b) follow a guided meditation based on either loving-kindness, which provided an opportunity to self-generate positive emotions, or mindfulness, which did not. All participants rated their emotions following the initial guided meditation and reported, week by week, whether they meditated during the ensuing 21 days. Analyses revealed that being exposed to the prioritizing positivity plus microintervention, relative to a control passage, amplified the effect of engaging in loving-kindness (vs. mindfulness) meditation on positive emotions. Additionally, the degree to which participants experienced positive emotions during first exposure to either meditation type predicted the frequency and duration at which they practiced meditation over the next 21 days. These findings show that the enjoyment of meditation can be experimentally amplified and that initial enjoyment predicts continued practice. Discussion spotlights the importance of differentiating effective and ineffective ways to pursue happiness. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Positive Affect and Health: What Do We Know and Where Next Should We Go?

Positive affect (PA) is associated with better health across a wide range of physical health outcomes. This review reflects on why the study of PA is an essential component of our understanding of physical health and expands on pathways that connect these two variables. To encourage forward movement in this burgeoning research area, measurement and design issues in the study of PA and health are discussed, as are the connections between PA and a range of different health outcomes. Plausible biological, social, and behavioral pathways that allow for positive feelings to get under the skin and influence physical wellness are detailed and framed in the context of several theoretical models. Finally, new directions for the field and important methodological and interpretative considerations that are essential to moving this important research area forward are explored.

Dyadic Coping, Respiratory Sinus Arrhythmia, and Depressive Symptoms Among Parents of Preschool Children

Respiratory sinus arrhythmia (RSA) is a biomarker of cardiac vagal tone that has been linked to social functioning. Recent studies suggest that RSA moderates the impact of interpersonal processes on psychosocial adjustment. The goal of this study was to assess whether RSA would moderate the association between dyadic coping (DC) and depressive symptoms. Eighty cohabiting couples raising preschool children completed the Dyadic Coping Inventory, the Center for Epidemiological Study-Depression scale and had their RSA assessed during a laboratory session. Couples completed follow-up assessments of depressive symptoms 6 and 12 months later. Data were analyzed using an Actor-Partner Interdependence Model. Results indicated that RSA moderated the actor effect of negative DC on depression in men, such that men with lower RSA had a stronger association between their own ratings of negative DC within the couple relationship and their own depressive symptoms, compared to their counterparts with higher RSA. RSA also moderated the partner effect of delegated DC on depressive symptoms. Among men with higher RSA, there was a significant negative association between their partner’s ratings of delegated DC within the couple relationship and the men’s depressive symptoms, whereas partner-rated delegated DC was unrelated to depressive symptoms among men with lower RSA. These results suggest that men with higher RSA may possess social skills and abilities that attenuate the association between stressful marital interactions and negative mood.

Well-Being Correlates of Perceived Positivity Resonance: Evidence From Trait and Episode-Level Assessments

Positivity resonance is a type of interpersonal connection characterized by shared positivity, mutual care and concern, and behavioral and biological synchrony. Perceived positivity resonance is hypothesized to be associated with well-being. In three studies ( N = 175, N = 120, N = 173), perceived positivity resonance was assessed at the trait level (Study 1) or the episode level, using the Day Reconstruction Method (Studies 2 and 3). Primary analyses reveal that perceived positivity resonance is associated with flourishing mental health, depressive symptoms, loneliness, and illness symptoms. These associations largely remain statistically significant when controlling for daily pleasant emotions or social interaction more generally. Ancillary analyses in Studies 2 and 3 support the construct validity of the episode-level assessment of perceived positivity resonance. The overall pattern of results is consistent with Positivity Resonance Theory. Discussion centers on avenues for future research and the need for behavioral interventions.