Acoustic regularities in infant-directed speech and song across cultures.

When interacting with infants, humans often alter their speech and song in ways thought to support communication. Theories of human child-rearing, informed by data on vocal signalling across species, predict that such alterations should appear globally. Here, we show acoustic differences between infant-directed and adult-directed vocalizations across cultures.

Reflections and Challenges of Pregnant and Postpartum Participant Recruitment in the Context of the Opioid Epidemic.

Purpose: Opioid use disorder among women of childbearing age has reached epidemic proportions. In rural regions of the United States, recruiting perinatal women who use nonmedical opioids to participate in research is wrought with challenges, including barriers such as community stigma, lack of transportation, and time constraints. The current study describes our process and challenges of recruiting pregnant and postpartum women in rural Indiana consisting of women who misuse opioids and those who do not.

Pregnancy Fasting in Ramadan: Toward a Biocultural Framework.

Pregnancy fasting poses a paradox: why would a woman restrict her diet during a period of increased nutritional need? This qualitative, cross-sectional study applied biological and cultural evolutionary theories of pregnancy diet to emic models of fasting with the aim of establishing a testable biocultural framework of pregnancy fasting. The research took place with Muslim women residing in Mysore, India. In-depth interviews were conducted with pregnant women who have experience and knowledge of fasting during during the holy month of Ramadan.

The impact of information about tobacco-related reproductive vs. general health risks on South Indian women's tobacco use decisions.

Smokeless tobacco use among Indian women is increasing despite prevention efforts. Evolutionary theories suggest that reproductive-aged women should be more concerned about immediate threats to reproduction than threats to survival occurring late in life. This study therefore compared an anti-tobacco intervention that emphasized near-term reproductive harms to one involving general harms occurring later in life.

Moralizing gods, impartiality and religious parochialism across 15 societies.

The emergence of large-scale cooperation during the Holocene remains a central problem in the evolutionary literature. One hypothesis points to culturally evolved beliefs in punishing, interventionist gods that facilitate the extension of cooperative behaviour toward geographically distant co-religionists. Furthermore, another hypothesis points to such mechanisms being constrained to the religious ingroup, possibly at the expense of religious outgroups.

Reframing HIV Stigma and Fear : Considerations from Social-ecological and Evolutionary Theories of Reproduction.

HIV stigma and fears surrounding the disease pose a challenge for public health interventions, particularly those that target pregnant women. In order to reduce stigma and improve the lives of vulnerable populations, researchers have recognized a need to integrate different types of support at various levels. To better inform HIV interventions, the current study draws on social-ecological and evolutionary theories of reproduction to predict stigma and fear of contracting HIV among pregnant women in South India.

Financial decision making power is associated with moderate to severe anemia: A prospective cohort study among pregnant women in rural South India.

Objective: According to the World Health Organization, about half of all pregnant women in India suffer from some form of anemia. While poor nutrition is the most common cause, social factors, such as gender and religion, also impact anemia status. This study investigates the relationship between anemia and socioeconomic and health-related factors among pregnant women in Mysore, India.

Innate food aversions and culturally transmitted food taboos in pregnant women in rural southwest India: separate systems to protect the fetus?

Pregnancy increases women's nutritional requirements, yet causes aversions to nutritious foods. Most societies further restrict pregnant women's diet with food taboos. Pregnancy food aversions are theorized to protect mothers and fetuses from teratogens and pathogens or increase dietary diversity in response to resource scarcity.

Ethnomedical and Sociocultural Factors of Pica Substances in Rural South India.

Pica, the intentional ingestion of culturally determined "nonfood" substances, occurs cross-culturally and most commonly during pregnancy. The current study describes women's perceptions of ethnomedical and sociocultural aspects of pica along with familial acquisition and transmission of knowledge and behaviors in a South Indian population. Findings showed that in contrast to Western models of pica, nonfood consumption is not entirely taboo; consumers rely on local remedies to cure overconsumption; and perceptions of prevalence extend beyond pregnancy.

Fetal Protection : The Roles of Social Learning and Innate Food Aversions in South India.

Pregnancy involves puzzling aversions to nutritious foods. Although studies generally support the hypotheses that such aversions are evolved mechanisms to protect the fetus from toxins and/or pathogens, other factors, such as resource scarcity and psychological distress, have not been investigated as often. In addition, many studies have focused on populations with high-quality diets and low infectious disease burden, conditions that diverge from the putative evolutionary environment favoring fetal protection mechanisms.

A test of three hypotheses of pica and amylophagy among pregnant women in Tamil Nadu, India.

Objectives: Pica has been studied in India and elsewhere for more than 100 years, yet no compelling and empirically well-supported explanation for it has emerged. Amylophagy, sometimes considered a type of pica and sometimes studied separately, is less frequently investigated and also lacks a convincing explanation. This study used a biocultural approach to test three hypotheses of pica and amylophagy: protection, hunger/nutrition, and psychological distress.

Adolescent fertility and risky environments: a population-level perspective across the lifespan.

Timing of first reproduction is a key life-history variable with important implications for global economic development and health. Life-history theory predicts that human reproductive strategies are shaped by mortality regimes. This study provides the first test of the relationship between population-level adolescent fertility (AF) and extrinsic risk at two time points.