Human Nature 19 (4):389-413 (2008)

Authors
Andrew Shaner
University of California, Los Angeles
Abstract
Siblings compete for parental care and feeding, while parents must allocate scarce resources to those offspring most likely to survive and reproduce. This could cause offspring to evolve traits that advertise health, and thereby attract parental resources. For example, experimental evidence suggests that bright orange filaments covering the heads of North American coot chicks may have evolved for this fitness-advertising purpose. Could any human mental disorders be the equivalent of dull filaments in coot chicks—low-fitness extremes of mental abilities that evolved as fitness indicators? One possibility is autism. Suppose that the ability of very young children to charm their parents evolved as a parentally selected fitness indicator. Young children would vary greatly in their ability to charm parents, that variation would correlate with underlying fitness, and autism could be the low-fitness extreme of this variation. This view explains many seemingly disparate facts about autism and leads to some surprising and testable predictions
Keywords Autism  Sexual selection  Parental selection  Sibling rivalry  Fitness indicator
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DOI 10.1007/s12110-008-9049-x
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References found in this work BETA

The Extreme Male Brain Theory of Autism.Simon Baron-Cohen - 2002 - Trends in Cognitive Sciences 6 (6):248-254.
The Signal Functions of Early Infant Crying.Joseph Soltis - 2004 - Behavioral and Brain Sciences 27 (4):443-458.
Parental Selection of Vocal Behavior.John L. Locke - 2006 - Human Nature 17 (2):155-168.

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