2 results
11 - Parental Care
- Edited by Jeremy Koster, Max Planck Institute for Evolutionary Anthropology, Leipzig, Brooke Scelza, University of California, Los Angeles, Mary K. Shenk, Pennsylvania State University
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- Book:
- Human Behavioral Ecology
- Published online:
- 07 March 2024
- Print publication:
- 14 March 2024, pp 256-282
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- Chapter
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Summary
Parental care in humans is remarkably extensive, with many individuals living only a fraction of their lives outside of the sphere of parental influence, and parental care is exceptionally plastic, with the extent and form of care varying across contexts and individuals. Behavioral ecological studies of parenting fall into three main foci. First, parental care is studied in terms of life history tradeoffs, including between mating and parenting effort, and between fertility and investment per offspring. Second, parental care is studied as a conflict trait, including sibling conflict, parent-offspring conflict, and sexual conflict between mothers and fathers. Finally, parental investment theory addresses how individual characteristics, such as birth order, sex and putative relatedness, influence parental strategies. For each focus, predictions are context-specific with socioecology dictating the local costs and payoffs to parental care. Over 50 years of behavioral ecological studies of parenting have transformed understandings of the human family, exposing the fragile mix of cooperation and competition underlying family relationships. Questions remain, however, particularly with regard to parental strategies in nonnuclear family structures, the role of physiological, psychological and cultural mechanisms in regulating adaptive strategies, and the coevolution of parental care with culturally variable beliefs about kinship, gender and reproduction.
The signal functions of early infant crying
- Joseph Soltis
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- Journal:
- Behavioral and Brain Sciences / Volume 27 / Issue 4 / August 2004
- Published online by Cambridge University Press:
- 14 February 2005, pp. 443-458
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- Article
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In this article I evaluate recent attempts to illuminate the human infant cry from an evolutionary perspective. Infants are born into an uncertain parenting environment, which can range from indulgent care of offspring to infanticide. Infant cries are in large part adaptations that maintain proximity to and elicit care from caregivers. Although there is not strong evidence for acoustically distinct cry types, infant cries may function as a graded signal. During pain-induced autonomic nervous system arousal, for example, neural input to the vocal cords increases cry pitch. Caregivers may use this acoustic information, together with other cues, to guide caregiving behavior. Serious pathology, on the other hand, results in chronically and severely abnormal cry acoustics. Such abnormal crying may be a proximate cause of adaptive infant maltreatment, in circumstances in which parents cut their losses and reduce or withdraw investment from infants with low survival chances. An increase in the amount of crying during the first few months of life is a human universal, and excessive crying, or colic, represents the upper end of this normal increase. Potential signal functions of excessive crying include manipulation of parents to acquire additional resources, honest signaling of need, and honest signaling of vigor. Current evidence does not strongly support any one of these hypotheses, but the evidence is most consistent with the hypothesis that excessive early infant crying is a signal of vigor that evolved to reduce the risk of a reduction or withdrawal of parental care.