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1.
Proc Natl Acad Sci U S A ; 121(30): e2306412121, 2024 Jul 23.
Artículo en Inglés | MEDLINE | ID: mdl-39028691

RESUMEN

We provide the mathematical and empirical foundations of the friendship paradox in networks, often stated as "Your friends have more friends than you." We prove a set of network properties on friends of friends and characterize the concepts of ego-based and alter-based means. We propose a network property called inversity that quantifies the imbalance in degrees across edges and prove that the sign of inversity determines the ordering between ego-based or alter-based means for any network, with implications for interventions. Network intervention problems like immunization benefit from using highly connected nodes. We characterize two intervention strategies based on the friendship paradox to obtain such nodes, with the alter-based and ego-based strategy. Both strategies provide provably guaranteed improvements for any network structure with variation in node degrees. We demonstrate that the proposed strategies obtain several-fold improvement (100-fold in some networks) in node degree relative to a random benchmark, for both generated and real networks. We evaluate how inversity informs which strategy works better based on network topology and show how network aggregation can alter inversity. We illustrate how the strategies can be used to control contagion of an epidemic spreading across a set of village networks, finding that these strategies require far fewer nodes to be immunized (less than 50%, relative to random). The interventions do not require knowledge of network structure, are privacy-sensitive, are flexible for time-sensitive action, and only require selected nodes to nominate network neighbors.

2.
Proc Natl Acad Sci U S A ; 119(9)2022 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-35217599

RESUMEN

Percolation theory has been widely used to study phase transitions in network systems. It has also successfully explained various macroscopic spreading phenomena across different fields. Yet, the theoretical frameworks have been focusing on direct interactions among nodes, while recent empirical observations have shown that indirect interactions are common in many network systems like social and ecological networks, among others. By investigating the detailed mechanism of both direct and indirect influence on scientific collaboration networks, here we show that indirect influence can play the dominant role in behavioral influence. To address the lack of theoretical understanding of such indirect influence on the macroscopic behavior of the system, we propose a percolation mechanism of indirect interactions called induced percolation. Surprisingly, our model exhibits a unique anisotropy property. Specifically, directed networks show first-order abrupt transitions as opposed to the second-order continuous transition in the same network structure but with undirected links. A mix of directed and undirected links leads to rich hybrid phase transitions. Furthermore, a unique feature of the nonmonotonic pattern is observed in network connectivities near the critical point. We also present an analytical framework to characterize the proposed induced percolation, paving the way to further understanding network dynamics with indirect interactions.

3.
Horm Behav ; 158: 105464, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38070354

RESUMEN

Experiencing early life adversity (ELA) alters stress physiology and increases the risk for developing psychiatric disorders. The social environment can influence dynamics of stress responding and buffer and/or transfer stress across individuals. Yet, the impact of ELA on sensitivity to the stress of others and social behavior following stress is unknown. Here, to test the impact of ELA on social and physiological responses to stress, circulating blood corticosterone (CORT) and social behaviors were assessed in adult male and female mice reared under limited bedding and nesting (LBN) or control conditions. To induce stress, one cagemate of a pair-housed cage underwent a footshock paradigm and was then returned to their unshocked partner. CORT was measured in both groups of mice 20 or 90 min after stress exposure, and social behaviors were recorded and analyzed. ELA rearing influenced the CORT response to stress in a sex-specific manner. In males, both control and ELA-reared mice exhibited similar stress transfer to unshocked cagemates and similar CORT dynamics. In contrast, ELA females showed a heightened stress transfer to unshocked cagemates, and sustained elevation of CORT relative to controls, indicating enhanced stress contagion and a failure to terminate the stress response. Behaviorally, ELA females displayed decreased allogrooming and increased investigative behaviors, while ELA males showed reduced huddling. Together, these findings demonstrate that ELA influenced HPA axis dynamics, social stress contagion and social behavior. Further research is needed to unravel the underlying mechanisms and long-term consequences of ELA on stress systems and their impact on behavioral outcomes.


Asunto(s)
Experiencias Adversas de la Infancia , Corticosterona , Humanos , Adulto , Ratones , Masculino , Animales , Femenino , Sistema Hipotálamo-Hipofisario/fisiología , Sistema Hipófiso-Suprarrenal/fisiología , Estrés Psicológico/psicología
4.
Horm Behav ; 162: 105508, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38513527

RESUMEN

Social environments modulate endocrine function, yet it is unclear whether individuals can become like their social partners in how they physiologically respond to stressors. This social transmission of hypothalamic-pituitary-adrenal (HPA) axis reactivity could have long-term consequences for health and lifespan of individuals if their social partners react to stressors with an exaggerated HPA axis response. We tested whether glucocorticoid levels in response to stress of breeding partners changes after breeding depending on whether partners had similar or dissimilar postnatal conditions. We manipulated postnatal conditions by mimicking early life stress in zebra finch chicks (Taeniopygia guttata) via postnatal corticosterone exposure. When they reached adulthood, we created breeding pairs where the female and male had experienced either the same or different early life hormonal treatment (corticosterone or control). Before and after breeding, we obtained blood samples within 3 min and after 10 min or 30 min of restraint stress (baseline, cort10, cort30). We found that corticosterone levels of individuals in response to restraint were affected by their own and their partner's early life conditions, but did not change after breeding. However, across all pairs, partners became more similar in cort30 levels after breeding, although differences between partners in cort10 remained greater in pairs with a corticosterone-treated female. Thus, we show that HPA axis response to stressors in adulthood can be modulated by reproductive partners and that similarity between partners is reduced when females are postnatally exposed to elevated glucocorticoids.


Asunto(s)
Corticosterona , Pinzones , Sistema Hipotálamo-Hipofisario , Sistema Hipófiso-Suprarrenal , Estrés Psicológico , Animales , Sistema Hipotálamo-Hipofisario/fisiología , Sistema Hipotálamo-Hipofisario/metabolismo , Femenino , Sistema Hipófiso-Suprarrenal/fisiología , Sistema Hipófiso-Suprarrenal/metabolismo , Masculino , Corticosterona/sangre , Estrés Psicológico/metabolismo , Estrés Psicológico/sangre , Pinzones/fisiología , Reproducción/fisiología , Restricción Física/fisiología
5.
Horm Behav ; 165: 105617, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39190970

RESUMEN

The observation of a stressed individual can trigger a stress response in a passive observer. Little is known about the mechanisms of this so-termed empathic stress, including the observer's empathic involvement with the stressful situation. In 108 opposite-sex stranger dyads, we expected to increase the observer's empathic involvement with a stressed target performing a standardized laboratory stressor (Trier Social Stress Test, TSST; Kirschbaum et al., 1993) by exposing observers themselves to the TSST one week earlier. Conversely, we intended to decrease empathic involvement by granting observers a powerful position over the targets (by asking them to evaluate the targets' TSST performance and allegedly decide on their financial compensation). A control group without any manipulation was also included. In the preregistered data analysis, two types of empathic stress were investigated: vicarious stress, which evolves irrespective of the target's stress response, and stress resonance, which is proportional to the target's stress response. Irrespective of manipulation, observers exhibited vicarious stress in subjective and high-frequency heart rate variability (HF-HRV), and synchronized with the targets' stress reactivity in cortisol release. Prior TSST experience unexpectedly decreased observers' self-reported empathy and vicarious cortisol stress reactivity. The power manipulation, conversely, led to stronger observer vicarious stress in overall heart rate and HF-HRV reactivity. Based on Wondra and Ellsworth's (2015) appraisal theory, we propose that, due to their prior stressor exposure, observers habituated to said stressor, and consequently changed their evaluation of the target's stressful situation. In contrast, observers in the powerful position may have felt responsible for the targets, triggering a stronger vicarious stressful experience.


Asunto(s)
Empatía , Frecuencia Cardíaca , Hidrocortisona , Estrés Psicológico , Humanos , Empatía/fisiología , Estrés Psicológico/psicología , Estrés Psicológico/metabolismo , Masculino , Femenino , Hidrocortisona/metabolismo , Adulto , Adulto Joven , Frecuencia Cardíaca/fisiología , Saliva/química , Saliva/metabolismo , Poder Psicológico
6.
Brain ; 146(5): 1993-2002, 2023 05 02.
Artículo en Inglés | MEDLINE | ID: mdl-36317463

RESUMEN

Epstein-Barr virus infection, and perhaps almost exclusively delayed Epstein-Barr virus infection, seems to be a prerequisite for the development of multiple sclerosis. Siblings provide protection against infectious mononucleosis by occasionally preventing delayed primary Epstein-Barr virus infection, with its associated high risk of infectious mononucleosis. Each additional sibling provides further protection according to the age difference between the index child and the sibling. The closer the siblings are in age, the higher the protection, with younger siblings being more protective against infectious mononucleosis than older siblings. If the hypothesis that delayed Epstein-Barr virus infection is necessary for the development of multiple sclerosis is true, then the relative risk of multiple sclerosis as a function of sibship constellation should mirror the relative risk of infectious mononucleosis as a function of sibship constellation. Such an indirect hypothesis test is necessitated by the fact that age at primary Epstein-Barr virus infection is unknown for practically all people who have not experienced infectious mononucleosis. In this retrospective cohort study using nationwide registers, we followed all Danes born during the period 1971-2018 (n = 2 576 011) from 1977 to 2018 for hospital contacts with an infectious mononucleosis diagnosis (n = 23 905) or a multiple sclerosis diagnosis (n = 4442), defining two different end points. Relative risks (hazard ratios) of each end point as a function of sibship constellation were obtained from stratified Cox regression analyses. The hazard ratios of interest for infectious mononucleosis and multiple sclerosis could be assumed to be identical (test for homogeneity P = 0.19), implying that having siblings, especially of younger age, may protect a person against multiple sclerosis through early exposure to the Epstein-Barr virus. Maximum protection per sibling was obtained by having a 0-2 years younger sibling, corresponding to a hazard ratio of 0.80, with a 95% confidence interval of 0.76-0.85. The corresponding hazard ratio from having an (0-2 years) older sibling was 0.91 (0.86-0.96). Our results suggest that it may be possible essentially to eradicate multiple sclerosis using an Epstein-Barr virus vaccine administered before the teenage years. Getting there would require both successful replication of our study findings and, if so, elucidation of why early Epstein-Barr virus infection does not usually trigger the immune mechanisms responsible for the association between delayed Epstein-Barr virus infection and multiple sclerosis risk.


Asunto(s)
Infecciones por Virus de Epstein-Barr , Mononucleosis Infecciosa , Esclerosis Múltiple , Niño , Adolescente , Humanos , Infecciones por Virus de Epstein-Barr/complicaciones , Mononucleosis Infecciosa/complicaciones , Hermanos , Herpesvirus Humano 4 , Estudios Retrospectivos , Esclerosis Múltiple/complicaciones
7.
J Biomed Inform ; 151: 104601, 2024 03.
Artículo en Inglés | MEDLINE | ID: mdl-38307358

RESUMEN

OBJECTIVE: The recent SARS-CoV-2 pandemic has exhibited diverse patterns of spread across countries and communities, emphasizing the need to consider the underlying population dynamics in modeling its progression and the importance of evaluating the effectiveness of non-pharmaceutical intervention strategies in combating viral transmission within human communities. Such an understanding requires accurate modeling of the interplay between the community dynamics and the disease propagation dynamics within the community. METHODS: We build on an interaction-driven model of an airborne disease over contact networks that we have defined. Using the model, we evaluate the effectiveness of temporal, spatial, and spatiotemporal social distancing policies. Temporal social distancing involves a pure dilation of the timeline while preserving individual activity potential and thus prolonging the period of interaction; spatial distancing corresponds to social distancing pods; and spatiotemporal distancing pertains to the situation in which fixed subgroups of the overall group meet at alternate times. We evaluate these social distancing policies over real-world interactions' data and over history-preserving synthetic temporal random networks. Furthermore, we evaluate the policies for the disease's with different number of initial patients, corresponding to either the phase in the progression of the infection through a community or the number of patients infected together at the initial infection event. We expand our model to consider the exposure to viral load, which we correlate with the meetings' duration. RESULTS: Our results demonstrate the superiority of decreasing social interactions (i.e., time dilation) within the community over partial isolation strategies, such as the spatial distancing pods and the spatiotemporal distancing strategy. In addition, we found that slow-spreading pathogens (i.e., pathogens that require a longer exposure to infect) spread roughly at the same rate as fast-spreading ones in highly active communities. This result is surprising since the pathogens may follow different paths. However, we demonstrate that the dilation of the timeline considerably slows the spread of the slower pathogens. CONCLUSIONS: Our results demonstrate that the temporal dynamics of a community have a more significant effect on the spread of the disease than the characteristics of the spreading processes.


Asunto(s)
COVID-19 , Humanos , COVID-19/epidemiología , Distanciamiento Físico , SARS-CoV-2 , Pandemias , Políticas
8.
Health Econ ; 33(11): 2575-2617, 2024 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-39107871

RESUMEN

To evidence the impact of air pollution on the health of urban populations, several studies use natural experiments that shift commuting from public transport to cars (or vice-versa). However, as public transport use declines, reduced interpersonal contact may lead to slower virus spread and thus lower respiratory morbidity. Using a difference-in-differences strategy, we show that respiratory hospitalisations are both positively affected by air pollution and negatively affected by viral spread following partial unavailability of public transport due to strikes in the ten most populated French cities during the period 2010-2015. Our results are in line with studies in other countries that have found a significant increase in urgent respiratory hospitalisations following a public transport strike, most likely due to car pollution, but we also find a detectable interaction with viral spread, which should not be overlooked when interpreting these studies.


Asunto(s)
Contaminación del Aire , Humanos , Francia/epidemiología , Contaminación del Aire/efectos adversos , Femenino , Hospitalización/estadística & datos numéricos , Masculino , Transportes , Persona de Mediana Edad , Adulto , Anciano
9.
Arch Sex Behav ; 53(8): 3087-3099, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38937395

RESUMEN

Using a vignette methodology, this study examined reactions to same-gender versus other-gender flirtation in a sample of 445 German young adults: 320 participants with a heterosexual orientation and 125 participants with a lesbian or gay (LG) orientation. Even in LG-friendly societies as Germany, receiving advances from someone of the same gender might still evoke heterosexuals' homonegativity. Another factor that might influence heterosexuals' reactions to same-gender flirtation is the fear of being misidentified as LG (social contagion concerns). Contrary to hypothesis, results provided little evidence to classify heterosexual participants' reactions to same-gender flirters as homonegative. Firstly, heterosexual participants showed the same degree of negative affect and avoidance behavior in the same-gender flirtation condition as LG participants did in the other-gender flirtation condition. Only positive affect scores were somewhat lower for heterosexual participants in the same-gender flirtation condition compared to LG participants in the other-gender flirtation condition. Secondly, when anti-LG attitudes and social contagion concerns were considered together, only social contagion concerns contributed to explaining variance in heterosexual participants' response to same-gender flirters. Specifically, the impact of social contagion concerns on heterosexual participants' avoidance of same-gender flirters was mediated by (lacking) positive affect, but not negative affect.


Asunto(s)
Heterosexualidad , Homosexualidad Femenina , Humanos , Femenino , Masculino , Alemania , Heterosexualidad/psicología , Adulto , Adulto Joven , Homosexualidad Femenina/psicología , Homosexualidad Masculina/psicología , Homofobia/psicología , Minorías Sexuales y de Género/psicología , Adolescente
10.
J Exp Child Psychol ; 238: 105801, 2024 02.
Artículo en Inglés | MEDLINE | ID: mdl-37883903

RESUMEN

In this study, it was investigated whether an emotional response would occur in pupil contagion by using skin conductance response (SCR) in 5- and 6-month-old infants. In the experiment, emotional responses to pupil diameter change (dilating/constricting) between the face and eyes regions were compared by using pupil diameter response and SCR. The results showed that pupil diameter responses to pupil diameter changes did not differ between face and eyes regions. The emotional response indicated by the SCR significantly increased when participants looked at dilating pupils of face stimuli compared with when participants looked at constricted pupils of face stimuli. In addition, we found a significant correlation between SCR and pupil dilation in the face. This means that pupil diameter expansion significantly increases emotional response in pupil dilation of the face region.


Asunto(s)
Emociones , Pupila , Lactante , Humanos , Pupila/fisiología , Emociones/fisiología , Cara
11.
Perception ; 53(10): 704-715, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39135380

RESUMEN

Previous research has shown a strong link between our sense of smell and emotion. More recently, the importance we attach to olfaction has been found to relate to our susceptibility to 'catch' the emotions of others. We explore this further by examining the relation between a newly developed measure of olfaction (social odour scale, SOS), which measures awareness of social odours, and emotional contagion susceptibility in female participants. The study therefore aimed to test the strength of this relationship and also help validate the English language version of the SOS. Female (n = 148) participants completed an online study that measured odour awareness [SOS; important of odour questionnaire, IOQ] and emotional contagion (EC). We found that the English version of the SOS yielded high reliability and supported the previous factor structure of the scale; additionally, we demonstrated a strong association between the SOS and IOQ which provides criterion validity for its usage. The study also revealed that whilst both the SOS and IOQ were positively associated with EC, the SOS was the more accurate predictor. These findings provide further validation for the use of the SOS and suggest that our subjective awareness of olfaction, especially concerning 'social odours' is an accurate predictor of emotional contagion.


Asunto(s)
Concienciación , Emociones , Odorantes , Humanos , Femenino , Adulto , Adulto Joven , Emociones/fisiología , Concienciación/fisiología , Adolescente , Percepción Olfatoria/fisiología , Percepción Social , Persona de Mediana Edad , Reproducibilidad de los Resultados
12.
Am J Primatol ; : e23671, 2024 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-39148223

RESUMEN

Contagious yawning (CY)-linked to physiological synchronization and possibly emotional contagion-occurs when one individual's yawn induces yawning in others. CY was investigated over different time windows (minutes from the triggering stimulus) via naturalistic or experimental studies (using real and video yawns, respectively) with contrasting results, especially in bonobos. We verified whether in bonobos result divergences may derive from different methods. We gathered yawning data on 13 bonobos at Twycross Zoo (UK) via a naturalistic (all-occurrences observations) and experimental approach (by showing yawn/control video stimuli). Based on literature, we used 1- and 3-min windows to detect CY. Due to fission-fusion management, individuals could form permanent or non-permanent associations (more/less familiar subjects under naturalistic setting). Video yawn stimuli may come from group mates/stranger models (more/less familiar subjects under the experimental setting). Stimulus type and time window affected CY modulating factors but not CY detection. Familiarity and age effect on CY showed opposite trends in 3-min trials and 1-min observations. CY was highest in oldest, non-permanently (rather than permanently) associated subjects in the naturalistic setting, but in the youngest subjects and with ingroup (rather than outgroup) models in trials. The age effect differences on CY might be due to decontextualized yawns and immature subject curiosity toward videos. The reversed familiarity effect suggests CY's context-dependent function in promoting social synchronization with socially distant group mates, as failing to coordinate as a group may lead to social disruption. Complementary methods are needed to fully understand motor replication phenomena.

13.
Am J Primatol ; 86(5): e23607, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38369692

RESUMEN

Rapid facial mimicry (RFM), the rapid and automatic replication of facial expression perceived, is considered a basic form of empathy and was investigated mainly during play. RFM occurs in Catarrhini (Old World primates), but it is not still demonstrated in Platyrrhini (New World primates). For this reason, we collected video data on playful interactions (Nplay_interactions = 149) in three species of spider monkeys (Ateles fusciceps-N = 11, Ateles hybridus-N = 14, and Ateles paniscus-N = 6) housed at La Vallée des Singes and the ZooParc de Beauval (France). For the first time, we demonstrated the occurrence of RFM in Platyrrhini (analyzing 175 events). Players' sex, age, species, relationship quality, and kinship did not modulate RFM probably due to the species' complex fission-fusion dynamics and flexible interindividual social relationships. Compared to the absence of any playful expressions or the presence of only not replicated play face, RFM prolonged the session duration and was sequentially associated with more types of more intense offensive playful patterns (patterns aimed at attacking/pursuing the playmate). We proposed that RFM may favor synchronization and context sharing between players, thus decreasing the risk of behavior misinterpretation while simultaneously fostering a more competitive nature of play. In conclusion, this study stimulates additional research on the evolutionary origins of motor mimicry in primates, possibly dating back to before the divergence of New and Old World monkeys. Furthermore, it also points toward the possibility that RFM may not always lead to cooperation but also to competition, depending on the context and species' social and cognitive features.


Asunto(s)
Atelinae , Platirrinos , Animales , Evolución Biológica , Cercopithecidae
14.
Adv Exp Med Biol ; 1458: 289-302, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39102204

RESUMEN

Nowadays, the medical COVID-19 emergency is ending worldwide, whereas there is an increasing need to understand the marks and the lessons learned from over two years of unprecedented changes in all life domains. Recent research has highlighted growing rates of psychological suffering among the general population as well as among university students, who were yet well-recognized as a vulnerable population even before the pandemic. The present work drives from university students' experience, and it aims to provide an overview of the key dimensions to take into account, in terms of main risks, changes, challenges, and resources, to develop updated tailored research and interventions promoting psychological health conditions in the current time within and beyond the educational context/university students' population. Implications for research and interventions are highlighted and discussed.


Asunto(s)
COVID-19 , Salud Mental , Estrés Psicológico , Estudiantes , Humanos , COVID-19/psicología , COVID-19/epidemiología , Estudiantes/psicología , Universidades , Estrés Psicológico/psicología , Estrés Psicológico/epidemiología , SARS-CoV-2 , Pandemias
15.
Proc Natl Acad Sci U S A ; 118(19)2021 05 11.
Artículo en Inglés | MEDLINE | ID: mdl-33906950

RESUMEN

Regional quarantine policies, in which a portion of a population surrounding infections is locked down, are an important tool to contain disease. However, jurisdictional governments-such as cities, counties, states, and countries-act with minimal coordination across borders. We show that a regional quarantine policy's effectiveness depends on whether 1) the network of interactions satisfies a growth balance condition, 2) infections have a short delay in detection, and 3) the government has control over and knowledge of the necessary parts of the network (no leakage of behaviors). As these conditions generally fail to be satisfied, especially when interactions cross borders, we show that substantial improvements are possible if governments are outward looking and proactive: triggering quarantines in reaction to neighbors' infection rates, in some cases even before infections are detected internally. We also show that even a few lax governments-those that wait for nontrivial internal infection rates before quarantining-impose substantial costs on the whole system. Our results illustrate the importance of understanding contagion across policy borders and offer a starting point in designing proactive policies for decentralized jurisdictions.


Asunto(s)
Enfermedad , Políticas , Cuarentena , COVID-19/prevención & control , Humanos , Modelos Teóricos , Pandemias/prevención & control , Cuarentena/métodos , SARS-CoV-2
16.
Proc Natl Acad Sci U S A ; 118(50)2021 12 14.
Artículo en Inglés | MEDLINE | ID: mdl-34876511

RESUMEN

The precise mechanisms by which the information ecosystem polarizes society remain elusive. Focusing on political sorting in networks, we develop a computational model that examines how social network structure changes when individuals participate in information cascades, evaluate their behavior, and potentially rewire their connections to others as a result. Individuals follow proattitudinal information sources but are more likely to first hear and react to news shared by their social ties and only later evaluate these reactions by direct reference to the coverage of their preferred source. Reactions to news spread through the network via a complex contagion. Following a cascade, individuals who determine that their participation was driven by a subjectively "unimportant" story adjust their social ties to avoid being misled in the future. In our model, this dynamic leads social networks to politically sort when news outlets differentially report on the same topic, even when individuals do not know others' political identities. Observational follow network data collected on Twitter support this prediction: We find that individuals in more polarized information ecosystems lose cross-ideology social ties at a rate that is higher than predicted by chance. Importantly, our model reveals that these emergent polarized networks are less efficient at diffusing information: Individuals avoid what they believe to be "unimportant" news at the expense of missing out on subjectively "important" news far more frequently. This suggests that "echo chambers"-to the extent that they exist-may not echo so much as silence.

17.
Dev Psychobiol ; 66(6): e22539, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39164829

RESUMEN

Infants' nonverbal expressions-a broad smile or a sharp cry-are powerful at eliciting reactions. Although parents' reactions to their own infants' expressions are relatively well understood, here we studied whether adults more generally exhibit behavioral and physiological reactions to unfamiliar infants producing various expressions. We recruited U.S. emerging adults (N = 84) prior to parenthood, 18-25 years old, 68% women, ethnically (20% Hispanic/Latino) and racially (7% Asian, 13% Black, 1% Middle Eastern, 70% White, 8% multiracial) diverse. They observed four 80-s audio-video clips of unfamiliar 2- to 6-month-olds crying, smiling, yawning, and sitting calmly (emotionally neutral control). Each compilation video depicted 9 different infants (36 clips total). We found adults mirrored behaviorally and physiologically: more positive facial expressions to infants smiling, and more negative facial expressions and pupil dilation-indicating increases in arousal-to infants crying. Adults also yawned more and had more pupil dilation when observing infants yawning. Together, these findings suggest that even nonparent emerging adults are highly sensitive to unfamiliar infants' expressions, which they naturally "catch" (i.e., behaviorally and physiologically mirror), even without instructions. Such sensitivity may have-over the course of humans' evolutionary history-been selected for, to facilitate adults' processing of preverbal infants' expressions to meet their needs.


Asunto(s)
Emociones , Expresión Facial , Bostezo , Humanos , Femenino , Masculino , Bostezo/fisiología , Adulto , Lactante , Adulto Joven , Adolescente , Emociones/fisiología , Llanto/fisiología , Conducta del Lactante/fisiología , Percepción Social , Conducta Imitativa/fisiología
18.
J Environ Manage ; 366: 121730, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-39013311

RESUMEN

Effectively managing drought in the China-Pakistan Economic Corridor (CPEC) region requires a precise understanding of the three-dimensional characteristics of meteorological drought (MD) and agricultural drought (AD), as well as the factors that trigger their propagation. This study employed non-stationary drought indices (NSPEI and SSMI) to develop a cutting-edge 3-dimensional drought identification model. This model was used to detect MD and AD patterns from 1981 to 2022 in the CPEC region and was integrated with binomial logistic regression to identify the critical factors that drive drought propagation. This study's key findings include: 1) Between 1981 and 2022, droughts in Xinjiang, China, exhibited a discernible southward migration trend, while in Pakistan, droughts showed a northward migration pattern. Drought frequency and extent have increased over time, with affected regions becoming more widespread in CPEC. Notably, drought events with higher preceding drought contagion indices (DCI) were more likely to evolve into extreme, long-term droughts. 2) Drought area emerged as a significant positive triggering factor for drought propagation in the CPEC region. Conversely, snowmelt in Xinjiang and the leaf area index for low vegetation in Pakistan acted as triggering elements affecting negatively. 3) Various factors played a pivotal role during drought propagation process, including geographical coordinates of drought centroids, DCI, and temperature variations. Additionally, snowmelt and snow evaporation significantly impacted drought propagation in Xinjiang, while vegetation cover in Pakistan played a crucial role during the drought propagation process. By utilizing four regression models and conducting comprehensive attribution analysis, this study sheds light on the characteristics of drought propagation and the factors influencing it. These findings are valuable for enhancing early warning systems and implementing effective drought mitigation strategies in the CPEC region.


Asunto(s)
Sequías , Pakistán , China , Agricultura
19.
J Youth Adolesc ; 2024 Jul 04.
Artículo en Inglés | MEDLINE | ID: mdl-38963579

RESUMEN

While the influence of high-status peers on maladaptive behaviors is well-documented, socialization processes of prosocial behavior through high-status peers remain understudied. This study examined whether adolescents' prosocial behavior was influenced by the prosocial behavior of the peers they liked and whether this effect was stronger when the peers they liked were also well-liked by their classmates. Three waves of data, six months apart, were collected among Chilean early adolescents who completed peer nominations and ratings at Time 1 (n = 294, Mage = 13.29, SD = 0.62; 55.1% male), Time 2 (n = 282), and Time 3 (n = 275). Longitudinal social network analyses showed that adolescents adopted the prosocial behavior of the classmates they liked - especially if these classmates were well-liked by peers in general. In addition, adolescents low in likeability were more susceptible to this influence than adolescents high in likeability. The influence resulted both in increases and - especially - decreases in prosocial behavior, depending on the level of prosociality of the liked peer. Findings suggest that likeability represents an important aspect of peer status that may be crucial for understanding the significance of peer influence with respect to prosocial behaviors during adolescence. Pre-Registration: https://osf.io/u4pxm .

20.
Artículo en Inglés | MEDLINE | ID: mdl-39227016

RESUMEN

Contagious diseases were among the most vexing problems in ancient theories of health, which could not easily account for how a corruption of one person's humors could cause a similar corruption in another's. One useful explanatory concept for Renaissance doctors tackling this theoretical gap was the phenomenon of resonance or "sympathetic vibration" - where one stationary string begins to vibrate spontaneously when a similarly tuned string is plucked nearby - as both resonance and contagion involved some mysterious, insensible action at a distance between an agent and a patient. Tracing the writings of Marsilio Ficino, Girolamo Fracastoro, and Girolamo Cardano, this essay explores the relationships between the writers' accounts of sympathetic vibrations and their contagion theories. It argues that different conceptions of the acoustic phenomenon - either as a manifestation of a Neo-Platonic World-Soul that underpinned the universe or else as a physical effect - revealed the writers' cosmological views that, in turn, informed their accounts of the human body and disease.

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