David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Behavioral and Brain Sciences 29 (3):259-280 (2006)
It has long been claimed that Homo sapiens is the only species that has language, but only recently has it been recognized that humans also have an unusual pattern of growth and development. Social mammals have two stages of pre-adult development: infancy and juvenility. Humans have two additional prolonged and pronounced life history stages: childhood, an interval of four years extending between infancy and the juvenile period that follows, and adolescence, a stage of about eight years that stretches from juvenility to adulthood. We begin by reviewing the primary biological and linguistic changes occurring in each of the four pre-adult ontogenetic stages in human life history. Then we attempt to trace the evolution of childhood and juvenility in our hominin ancestors. We propose that several different forms of selection applied in infancy and childhood; and that, in adolescence, elaborated vocal behaviors played a role in courtship and intrasexual competition, enhancing fitness and ultimately integrating performative and pragmatic skills with linguistic knowledge in a broad faculty of language. A theoretical consequence of our proposal is that fossil evidence of the uniquely human stages may be used, with other findings, to date the emergence of language. If important aspects of language cannot appear until sexual maturity, as we propose, then a second consequence is that the development of language requires the whole of modern human ontogeny. Our life history model thus offers new ways of investigating, and thinking about, the evolution, development, and ultimately the nature of human language.
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Morten H. Christiansen & Nick Chater (2008). Language as Shaped by the Brain. Behavioral and Brain Sciences 31 (5):489-509.
W. Tecumseh Fitch (2005). The Evolution of Language: A Comparative Review. [REVIEW] Biology and Philosophy 20 (2-3):193-203.
Thomas Suddendorf & Michael C. Corballis (2007). Mental Time Travel Across the Disciplines: The Future Looks Bright. Behavioral and Brain Sciences 30 (3):335-345.
John L. Locke (2006). Parental Selection of Vocal Behavior. Human Nature 17 (2):155-168.
Sergio Balari & Guillermo Lorenzo (2015). The End of Development. Biological Theory 10 (1):60-72.
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