Protective role of parenthood on age-related brain function in mid- to late-life.

The experience of parenthood can profoundly alter one's body, mind, and environment, yet we know little about the long-term associations between parenthood and brain function and aging in adulthood. Here, we investigate the link between number of children parented (parity) and age on brain function in 19,964 females and 17,607 males from the UK Biobank. In both females and males, increased parity was positively associated with functional connectivity, particularly within the somato/motor network. Critically, the spatial topography of parity-linked effects was inversely correlated with the impact of age on functional connectivity across the brain for both females and males, suggesting that a higher number of children is associated with patterns of brain function in the opposite direction to age-related alterations. These results indicate that the changes accompanying parenthood may confer benefits to brain health across the lifespan, highlighting the importance of future work to understand the associated mechanisms.

Neural correlates of altered emotional responsivity to infant stimuli in mothers who use substances.

Mothers who use substances during pregnancy and postpartum may have altered maternal behavior towards their infants, which can have negative consequences on infant social-emotional development. Since maternal substance use has been associated with difficulties in recognizing and responding to infant emotional expressions, investigating mothers' subjective responses to emotional infant stimuli may provide insight into the neural and psychological processes underlying these differences in maternal behavior. In this study, 39 mothers who used substances during the perinatal period and 42 mothers who did not underwent functional magnetic resonance imaging while viewing infant faces and hearing infant cries. Afterwards, they rated the emotional intensity they thought each infant felt ('think'-rating), and how intensely they felt in response to each infant stimulus ('feel'-rating). Mothers who used substances had lower 'feel'-ratings of infant stimuli compared to mothers who did not. Brain regions implicated in affective processing (e.g., insula, inferior frontal gyrus) were less active in response to infant stimuli, and activity in these brain regions statistically predicted maternal substance-use status. Interestingly, 'think'-ratings and activation in brain regions related to cognitive processing (e.g., medial prefrontal cortex) were comparable between the two groups of mothers. Taken together, these results suggest specific neural and psychological processes related to emotional responsivity to infant stimuli may reflect differences in maternal affective processing and may contribute to differences in maternal behavior in mothers who use substances compared to mothers who do not. The findings suggest potential neural targets for increasing maternal emotional responsivity and improving child outcomes.

Maternal psychological risk and the neural correlates of infant face processing: A latent profile analysis.

Maternal psychological factors, including anxiety, depression, and substance use, may negatively affect parenting. Previous works with mothers have often assessed each of these factors in isolation despite their frequent co-occurrence. Psychological factors have also been associated with neural processing of facial stimuli, specifically the amplitude (i.e., size) and latency (i.e., timing) of the face-specific N170 event-related potential. In the current study, 106 mothers completed measures assessing maternal psychological factors-anxiety, depression, and substance use. A latent profile analysis was used to identify profiles of psychological factors and assess profile associations with the N170 elicited by infant faces and with parental reflective functioning (PRF) as a measure related to caregiving. Two profiles (termed high and low psychological risk) were identified, with the higher risk profile associated with delayed N170 latency responses to infant faces. An exploratory analysis evidenced an indirect effect between the higher psychological risk profile and lower PRF through delayed N170 latency responses to infant faces. Taken together, maternal psychological risk across multiple indicators may together shape neural processing of infant faces, which may have downstream consequences for caregiving.

Nonverbal face-to-face interactions in macaques and humans: A translational pilot study.

Human and nonhuman primate mother-infant dyads engage in face-to-face interactions critical for optimal infant development. In semi-free-ranging rhesus macaques (Macaca mulatta), maternal primiparity and infant sex influence the expression of nonverbal face-to-face mother-infant interactions. However, whether similar patterns of variation exist in laboratory-housed macaques or human mothers is not well understood. Comparing both species would yield information regarding the translational validity of macaques to humans in this important social/developmental domain. In this pilot study, we first compared semi-free-ranging (n = 39) and laboratory-housed (n = 20) macaques, finding that laboratory-housed dyads, first-time mothers, and mothers of sons engaged in higher rates of face-to-face interactions regardless of housing. After translating the nonhuman primate coding scheme for use in a small but diverse group of human mother-infant dyads (N = 27; 44.4% African American, 18.5% American Indian, 7.4% Asian/Asian American, and 29.6% White), we found that, like macaques, human mothers of sons engaged in more face-to-face interactions; however, experienced (vs. first-time) mothers engaged in more interactions. Macaques and humans also engaged in species-specific interactions with their infants. We conclude that components of caregiver-infant nonverbal face-to-face interactions are translatable across human and nonhuman primate species and represent an exciting avenue for future caregiving work.

Cortisol reactivity to a laboratory stressor predicts increases in depressive symptoms in perinatal and nulliparous women during population-level stress.

BACKGROUND: Research suggests a link between stress and depression, especially in high-risk groups. The perinatal period is known as a time of increased risk for depression and pregnancy has been associated with alterations in cortisol levels; however, limited research has assessed cortisol reactivity during pregnancy. Finally, no studies have yet examined whether cortisol reactivity predicts later depressive symptoms during a population-level stressor, such as the COVID-19 pandemic. METHODS: The current study examined whether cortisol reactivity in perinatal and nulliparous women a year before the onset of COVID-19 predicted increases in depressive symptoms during the initial stage of the pandemic. Participants were 68 women (33 pregnant, Mage = 30.6; 35 nulliparous, Mage = 28.4) who, approximately a year before COVID-19, responded to a depressive symptoms questionnaire and completed a psychosocial stress test, during which they provided salivary cortisol samples. Shortly after the onset of pandemic-related closures (April 2020; postpartum for previously pregnant participants), participants completed follow-up questionnaires assessing current depressive symptoms. RESULTS: Analyses showed that cortisol reactivity at baseline predicted increases in depressive symptoms at follow-up. Perinatal and nulliparous women did not differ in this association. LIMITATIONS: The present study was limited by a moderate sample size and heterogeneity in terms of gestational week, restricting inferences about specific stages of pregnancy. CONCLUSIONS: Our findings suggest that cortisol reactivity to a laboratory stressor is a biomarker of risk for increased depressive symptoms during ecological stress in women. Biomarkers like these increase our understanding of depression risk and may help to identify individuals in need of interventions.

EEG coherence before and after giving birth.

During pregnancy and the postpartum period, changes in brain volume and in motivational, sensory, cognitive, and emotional processes have been described. However, to date, longitudinal modifications of brain function have been understudied. To explore regional cortical coupling, in pregnancy and at 3 months postpartum, we analyzed resting-state electroencephalographic (EEG) coherence in the delta, theta, alpha1, alpha2, beta1, and beta2 frequency bands across frontal and parietal regions of the maternal brain (Fp1, Fp2, F3, F4, P3, and P4). We found that from pregnancy to the postpartum period, mothers showed less intrahemispheric EEG coherence between the frontal and parietal regions in the alpha1 and alpha2 bands, as well as greater interhemispheric EEG coherence between frontopolar regions in the beta2 band. These changes suggest decreased inhibition of neural circuits. These neurophysiological changes may represent an adaptive process characteristic of motherhood.

Envisioning motherhood: Mental-state language in caregiving narratives across the perinatal period.

Nancy Suchman's work highlighted the fundamental role of maternal mentalization in maternal addiction, mental health, and caregiving challenges. In this study, we aimed to examine the role of mental-state language (MSL) as a measure of mentalization in prenatal and postnatal narratives and their sentiment in a sample of 91 primarily White mothers from the western United States, followed from the second trimester of pregnancy, through the third trimester, to 4 months postpartum. Specifically, we investigated the use of affective and cognitive MSL in prenatal narratives when mothers visualized caring for their baby and postnatal narratives when mothers compared their prenatal visualization to the current caregiving reality. Results indicated moderate consistency in MSL between the second and third trimesters, but prenatal and postnatal MSL was not significantly correlated. Across all time points, higher use of MSL was related to more positive sentiment, indicating an association between mentalization and positive caregiving representations across the perinatal period. Women used more affective than cognitive MSL in prenatal imagination of caregiving, but this pattern was reversed in their postpartum reflection. Implications on assessing parental mentalization prenatally and considering the relative dominance of affective and cognitive mentalizing are discussed while considering study limitations.

El trabajo de Nancy Suchman subrayó el papel fundamental de la mentalización maternal en la adicción materna, la salud mental y los retos de la prestación de cuidado. En este estudio, nos propusimos examinar el papel del lenguaje del estado mental como una medida de mentalización en las narrativas pre- y postnatales y su sentimiento en un grupo muestra de 91 madres primariamente blancas del oeste de los Estados Unidos, a quienes se les dio seguimiento a partir del segundo trimestre de embarazo, a través del tercer trimestre, hasta 4 meses después del parto. Específicamente, investigamos el uso de lenguaje del estado mental afectivo y cognitivo en las narrativas prenatales cuando las madres visualizaban el cuidado de su bebé, y las narrativas postnatales cuando las madres comparaban su visualización prenatal con la presente realidad de prestación de cuidado. Los resultados indicaron una consistencia moderada en el lenguaje del estado mental entre el segundo y tercer trimestres, pero el lenguaje del estado mental prenatal y postnatal no fue significativamente correlacionado. A los largo de todos los punto temporales, el más alto uso del lenguaje del estado mental se relacionó con un más positivo sentimiento, indicando así una asociación entre la mentalización y las representaciones positivas de la prestación de cuidado a lo largo del período perinatal. Las mujeres usaron más lenguaje del estado mental afectivo que cognitivo en la imaginación prenatal de la prestación de cuidado, pero este patrón se invirtió en sus reflexiones después del parto. Se discuten las implicaciones sobre el tener acceso a la mentalización del progenitor prenatalmente y considerar el relativo dominio del mentalizarse en lo afectivo y cognitivo, al tiempo que se consideran las limitaciones del estudio.

Le travail de Nancy Suchman a mis en lumière le rôle fondamental de la mentalisation maternelle dans l'addiction maternelle, la santé mentale et les défis de la prestation de soins. Dans cette étude nous nous sommes donné pour but d'examiner le rôle du langage d'état mental en tant que mesure de la mentalisation dans les narrations prénatales et postnatales et leur sentiment chez un échantillon de 91 mères dans l'ensemble blanches vivant dans l'ouest des Etats-Unis d'Amériques, et suivies du second trimestre de la grossesse, durant le troisième trimestre jusqu'à 4 mois après la naissance. Plus particulièrement nous nous sommes penchés sur l'utilisation du langage d'état mental affectif et cognitif dans des narrations prénatales lorsque les mères visualisaient les soins à leur bébé, et les narrations postnatales lorsque les mères comparaient leur visualisation prénatale à la réalité actuelle des soins au bébé. Les résultats ont indiqué une cohérence modérée dans le langage d'état mental entre les second et troisième trimestres mais le langage d'état mental prénatal et postnatal n'était pas significativement corrélé. Au travers de tous les points temporels l'utilisation plus grande de langage d'état mental était liée à un sentiment plus positif, indiquant un lien entre la mentalisation et les représentations positives des soins au travers de la période périnatale. Les femmes ont utilisé un langage d'état mentale plus affectif que cognitif dans l'imagination prénatale des soins, mais ce schéma était renversé dans leur réflexion postpartum. Les implications pour l'évaluation de la mentalisation parentale avant la naissance et pour la considération de la domination relative de la mentalisation affective et cognitive sont discutées, tout en considérant les limites de l'étude.

Matrescence: lifetime impact of motherhood on cognition and the brain.

Profound environmental, hormonal, and neurobiological changes mark the transition to motherhood as a major biosocial life event. Despite the ubiquity of motherhood, the enduring impact of caregiving on cognition and the brain across the lifespan is not well characterized and represents a unique window of opportunity to investigate human neural and cognitive development. By integrating insights from the human and animal maternal brain literatures with theories of cognitive ageing, we outline a framework for understanding maternal neural and cognitive changes across the lifespan. We suggest that the increased cognitive load of motherhood provides an initial challenge during the peripartum period, requiring continuous adaptation; yet when these demands are sustained across the lifespan, they result in increased late-life cognitive reserve.

Racial disparities in EEG research and their implications for our understanding of the maternal brain.

Racial disparities in maternal health are alarming and persistent. Use of electroencephalography (EEG) and event-related potentials (ERPs) to understand the maternal brain can improve our knowledge of maternal health by providing insight into mechanisms underlying maternal well-being, including implications for child development. However, systematic racial bias exists in EEG methodology-particularly for Black individuals-and in psychological and health research broadly. This paper discusses these biases in the context of EEG/ERP research on the maternal brain. First, we assess the racial/ethnic diversity of existing ERP studies of maternal neural responding to infant/child emotional expressions, using papers from a recent meta-analysis, finding that the majority of mothers represented in this research are of White/European ancestry and that the racially and ethnically diverse samples that are present are limited in terms of geography. Therefore, our current knowledge base in this area may be biased and not generalizable across racially diverse mothers. We outline factors underlying this problem, beginning with the racial bias in EEG equipment that systematically excludes individuals of African descent, and also considering factors specific to research with mothers. Finally, we highlight recent innovations to EEG hardware to better accommodate diverse hairstyles and textures, and other important steps to increase racial and ethnic representativeness in EEG/ERP research with mothers. We urge EEG/ERP researchers who study the maternal brain-including our own research group-to take action to increase racial diversity so that this research area can confidently inform understanding of maternal health and contribute to minimizing maternal health disparities.

Adult attachment is related to maternal neural response to infant cues: an ERP study.

Maternal attachment security is an important predictor of caregiving . However, little is known regarding the neurobiological mechanisms by which attachment influences processing of infant cues, a critical component of caregiving. We examined whether attachment security, measured by the Adult Attachment Interview, might relate to neural responses to infant cues using event-related potentials. Secure (n=35) and insecure (n=24) mothers viewed photographs of infant faces and heard recordings of infant vocalizations while electroencephalography was recorded. We examined initial processing of infant faces (N170) and cries (N100), and attentional allocation to infant faces and cries (P300). Secure mothers were significantly faster than insecure mothers to orient to infant cries (N100), structurally encode their own infant's face (N170), and attend to infant faces (P300). These differences may elucidate mechanisms underlying how attachment may shape neural processing of infant cues and highlight the use ofsocial neuroscientific approaches in examining clinically relevant aspects of attachment.

Exploring resting frontal EEG and reflective functioning in maternal substance use.

Maternal substance use is associated with altered neural activity and poor offspring outcomes, which may be facilitated by suboptimal caregiving in the form of impaired parental reflective functioning (PRF). To investigate these associations, the resting-state frontal electroencephalography (EEG) power of 48 substance-using mothers and 37 non-substance-using mothers were examined, specifying seven frequency bands: delta, theta, alpha, alpha1, alpha2, beta, and gamma. Substance-using mothers exhibited enhanced beta and gamma spectral power compared to non-substance-using mothers, potentially reflecting higher arousal states in substance-using mothers. There were no between-group differences in any component of PRF (i.e., levels of pre-mentalizing, certainty, and interest and curiosity). Whole-sample analyses revealed significant positive correlations between pre-mentalizing and delta spectral power. Taken together, these findings suggest potential neural correlates of maternal substance use and PRF, providing an important next step into examining associations between maternal substance use and poor child outcomes.

Se asocia el uso materno de sustancias con la actividad neural alterada y el débil resultado en los hijos, lo cual pudiera ser favorecido por una prestación de cuidado subóptima en forma de un impedido funcionamiento con reflexión (PRF) en el progenitor. Para investigar estas asociaciones, se examinó la fuerza de la electroencefalografía frontal en estado de descanso de 48 madres que usaban sustancia y 37 madres que no usaban sustancias, especificando siete bandas de frecuencia: delta, theta, alpha, alpha 1, alpha 2, beta y gamma. Las madres que usaban sustancias mostraron una fuerza espectral aumentada en beta y gamma, tal como se les comparó con las madres que no usaban sustancias, lo que potencialmente refleja estados más altos de agitación en las madres que usaban sustancias. No se dieron diferencias entre grupos en ninguno de los componentes de PRF (v.g. niveles de pre-mentalización, opacidad e interés y curiosidad). Los análisis de todas las muestras revelaron correlaciones positivas significativas entre pre-mentalización y la fuerza espectral delta. Tomándolos en conjunto, estos resultados indican posibles correlaciones neurales entre del uso materno de sustancias y PRF, lo cual aporta un importante próximo paso para examinar las asociaciones entre el uso materno de sustancias y los débiles resultados en el niño.

La toxicomanie maternelle est liée à une activité neuronale altérée et de mauvais résultats sur les enfants de la personne, ce qui peut être facilité par un mode de soin suboptimal sous la forme d'un fonctionnement de réflexion parentale (PRF en anglais) altéré. Pour enquêter sur ces liens, l'électroencéphalographie frontale au repos (EEG) de 48 mères toxicomanes et de 37 mères non-toxicomanes a été examiné, plus spécifiquement sur quatre bandes de fréquences : delta, thêta, alpha, alpha1, alpha2, béta, et gamma. Les mères toxicomanes ont fait preuve d'une puissance spectrale de béta et gamma importante comparées aux mères non-toxicomanes, ce qui reflète peut-être de plus d' états d'excitation chez les mères toxicomanes. Nous n'avons observé aucune différence entre les groupes pour ce qui concerne les composantes de la PRF (soit, niveaux de pré-mentalisation, d'opacité, d'intérêt et de curiosité). Des analyses sur tout l'échantillon ont révélé des corrélations positives importantes entre la puissance spectrale de pré-mentalisation et la puissance spectrale delta. Considérés dans l'ensemble, ces résultats suggèrent un corrélat neural potentiel de la toxicomanie maternelle et de la PRF, ce qui présente une nouvelle étape importante dans l'examen des liens entre la toxicomanie maternelle et les mauvais résultats sur l'enfant.

The effects of prenatal stress on neural responses to infant cries in expectant mothers and fathers.

The perinatal period is characterized by distinct neurobiological and psychological changes initiated prenatally, which may both facilitate postpartum caregiving and increase vulnerability to stress. Parents need to adapt to the high demands of caregiving, which include responding to salient infant cues, such as infant cries. Therefore, assessing the impact of prenatal stress exposure on parents' neural processing of infant cries may elucidate mechanisms conferring early risk for detrimental perinatal outcomes. Using event-related potentials, we examined whether prenatal perceived stress affected neural markers of perceptual (N1, P2) and attentional (LPP) processes elicited by high- and low-distress infant cries in expectant mothers (n = 38) and fathers (n = 30). Results evidenced that prenatal perceived stress impacted parents' sustained attentional processing (LPP) of infant cries, but not early perceptual responses (N1, P2). Specifically, higher levels of prenatal perceived stress were associated with a greater LPP response to low-distress, but not high-distress, infant cries. There were no parental sex differences in prenatal perceived stress or neural responses to infant cries. Increased attentional processing of low-distress cries in highly stressed parents may reflect uncertainty regarding infant distress level, thereby requiring more attentional resources. Overall, our results suggest that prenatal stress impacts processing of infant cues, even before birth.

Impact of Frailty on Morbidity and Mortality in Adult Patients Undergoing Surgical Evacuation of Acute Traumatic Subdural Hematoma.

OBJECTIVE: To determine whether baseline frailty is an independent predictor of extended hospital length of stay (LOS), nonroutine discharge, and in-hospital mortality after evacuation of an acute traumatic subdural hematoma (SDH). METHODS: A retrospective cohort study was performed. All adult patients who underwent surgery for an acute traumatic SDH were identified using the National Trauma Database from the year 2017. Patients were categorized into 3 cohorts based on the criteria of the 5-item modified frailty index (mFI-5): mFI = 0, mFI = 1, or mFI = 2+. A multivariate logistic regression analysis was used to identify independent predictors of extended LOS, nonroutine discharge, and in-hospital mortality. RESULTS: Of the 2620 patients identified, 41.7% were classified as mFI = 0, 32.7% as mFI = 1, and 25.6% as mFI = 2+. Rates of extended LOS and in-hospital mortality did differ significantly between the cohorts, with the mFI = 0 cohort most often experiencing a prolonged LOS (mFI = 0: 29.41% vs. mFI = 1: 19.45% vs. mFI = 2+: 19.73%, P < 0.001) and in-hospital mortality (mFI = 0: 24.66% vs. mFI = 1: 18.11% vs. mFI = 2+: 21.58%, P = 0.002). On multivariate regression analysis, when compared with mFI = 0, mFI = 2+ (odds ratio 1.4, P = 0.03) predicted extended LOS and nonroutine discharge (odds ratio 1.61, P = 0.001). CONCLUSIONS: Our study demonstrates that baseline frailty may be an independent predictor of extended LOS and nonroutine discharge, but not in-hospital mortality, in patients undergoing evacuation for an acute traumatic SDH. Further investigations are warranted as they may guide treatment plans and reduce health care expenditures for frail patients with SDH.

Emotion regulation during pregnancy: a call to action for increased research, screening, and intervention.

This paper serves as a call to action for increased focus on emotion regulation during pregnancy. We make this case by summarizing the limited research to date on this topic, which has demonstrated that emotion regulation in pregnant people has important mental health, caregiving, and developmental correlates throughout the perinatal period. Given its crosscutting and modifiable nature, bolstering emotion regulation during pregnancy has the potential for considerable intergenerational consequences, and it is critical to further investigate this construct.

Maternal perinatal anxiety and neural responding to infant affective signals: Insights, challenges, and a road map for neuroimaging research.

Anxiety symptoms are common among women during pregnancy and the postpartum period, potentially having detrimental effects on both mother and child's well-being. Perinatal maternal anxiety interferes with a core facet of adaptive caregiving: mothers' sensitive responsiveness to infant affective communicative 'cues.' This review summarizes the current research on the neural correlates of maternal processing of infant cues in the presence of perinatal anxiety, outlines its limitations, and offers next steps to advance future research. Functional neuroimaging studies examining the neural circuitry involved in, and electrophysiological studies examining the temporal dynamics of, processing infant cues during pregnancy and postpartum are reviewed. Studies have generally indicated mixed findings, although emerging themes suggest that anxiety may be implicated in several stages of processing infant cues- detection, interpretation, and reaction- contingent upon cue valence. Limitations include inconsistent designs, lack of differentiation between anxiety and depression symptoms, and limited consideration of parenting-specific (versus domain-general) anxiety. Future studies should incorporate longitudinal investigation of multiple levels of analysis spanning neural, cognitive, and observed aspects of sensitive caregiving.

Imagining the baby: Neural reactivity to infant distress and mind-mindedness in expectant parents.

Neural and psychological processes in pregnancy may be important antecedents for caregiving postpartum. Employing event-related potentials, we examined neural reactivity to infant emotional faces during the third trimester of pregnancy in expectant mothers (n = 38) and expectant fathers (n = 30). Specifically, expectant parents viewed infant distress and infant neutral faces while electroencephalography was simultaneously recorded. As a psychological measure, we assessed prenatal mind-mindedness towards the unborn child and examined whether neural processing of infant cues was associated with levels of mind-mindedness. Expectant fathers evidenced greater P300 reactivity to infant distress, relative to neutral, faces than expectant mothers. Furthermore, P300 reactivity to infant distress, relative to infant neutral, faces was associated with levels of prenatal mind-mindedness in expectant fathers but not expectant mothers. These findings indicate significant sex differences in the prenatal neural processing of infant cues and relations between neural reactivity to infant distress and the emergence of parental mind-mindedness.

Prior reproductive experience modulates neural responses to infant faces across the postpartum period.

Infant-cue processing facilitates sensitive maternal care, which is necessary in the formation of healthy mother-infant attachment. Mothers may be particularly focused on cue processing early postpartum, contributing to intense preoccupation with their infant's well-being. Prior reproductive experience, or parity, may also impact the intensity of infant-cue processing and has been found to influence P300 neural responses to infant faces during pregnancy and at 2 months postpartum. However, we do not know whether this parity effect persists. Thus, we examined the P300 to infant faces in 59 mothers at 2 and 7 months postpartum. Our main finding was that primiparous, as compared to multiparous, women showed a significantly higher P300 to infant faces across the postpartum period. Findings further emphasize the importance of studying parity and its impact on the neural processing of infant faces.

Facial recognition during early motherhood: Investigating the persistence of age and affect biases.

Converging evidence demonstrates increased levels of sensitivity to infant faces in mothers. This may be reflective of a series of psychological and neurobiological changes that occur in the transition to, and during early, parenthood for the purpose of appropriate caregiving; however, this enhanced infant facial recognition is in contrast with the general adult literature regarding facial processing. In the current study, we aimed to replicate a prior study of emotion facial recognition in pregnant women in a sample of mothers with children under a year old, utilizing a paradigm in which adult and infant faces gradually changed from neutral expressions to either happy or sad expressions. Mothers were faster at the recognition of adult faces in comparison to infant faces, and were also faster at happy faces in comparison to sad faces. Results are discussed in context of the current processing literature regarding the perinatal period, and implications for the persistence of the own-age bias and happy face advantage are considered.

The Presence of Another Person Influences Oscillatory Cortical Dynamics During Dual Brain EEG Recording.

Humans are innately social creatures and the social environment strongly influences brain development. As such, the human brain is primed for and sensitive to social information even in the absence of explicit task or instruction. In this study, we examined the influence of different levels of interpersonal proximity on resting state brain activity and its association with social cognition. We measured EEG in pairs of 13 typically developing (TD) adults seated in separate rooms, in the same room back-to-back, and in the same room facing each other. Interpersonal proximity modulated broadband EEG power from 4-55 Hz and individual differences in self-reported social cognition modulated these effects in the beta and gamma frequency bands. These findings provide novel insight into the influence of social environment on brain activity and its association with social cognition through dual-brain EEG recording and demonstrate the importance of using interactive methods to study the human brain.