Unraveling the evolution of uniquely human cognition

Edited by Richard G. Klein, Stanford University, Stanford, CA, and approved January 7, 2016 (received for review November 12, 2015)
June 6, 2016
113 (23) 6348-6354

Abstract

A satisfactory account of human cognitive evolution will explain not only the psychological mechanisms that make our species unique, but also how, when, and why these traits evolved. To date, researchers have made substantial progress toward defining uniquely human aspects of cognition, but considerably less effort has been devoted to questions about the evolutionary processes through which these traits have arisen. In this article, I aim to link these complementary aims by synthesizing recent advances in our understanding of what makes human cognition unique, with theory and data regarding the processes of cognitive evolution. I review evidence that uniquely human cognition depends on synergism between both representational and motivational factors and is unlikely to be accounted for by changes to any singular cognitive system. I argue that, whereas no nonhuman animal possesses the full constellation of traits that define the human mind, homologies and analogies of critical aspects of human psychology can be found in diverse nonhuman taxa. I suggest that phylogenetic approaches to the study of animal cognition—which can address questions about the selective pressures and proximate mechanisms driving cognitive change—have the potential to yield important insights regarding the processes through which the human cognitive phenotype evolved.

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Acknowledgments

I thank B. Hare, J. Tan, C. Krupenye, and two anonymous reviewers for helpful comments on an earlier draft of this manuscript, J. Tan for sharing the photograph in Fig. 1, and the Stanton Foundation for financial support during the time the manuscript was written.

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Information & Authors

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Published in

Go to Proceedings of the National Academy of Sciences
Go to Proceedings of the National Academy of Sciences
Proceedings of the National Academy of Sciences
Vol. 113 | No. 23
June 7, 2016
PubMed: 27274041

Classifications

Submission history

Published online: June 6, 2016
Published in issue: June 7, 2016

Keywords

  1. cognitive evolution
  2. human evolution
  3. comparative psychology
  4. human uniqueness
  5. cognition

Acknowledgments

I thank B. Hare, J. Tan, C. Krupenye, and two anonymous reviewers for helpful comments on an earlier draft of this manuscript, J. Tan for sharing the photograph in Fig. 1, and the Stanton Foundation for financial support during the time the manuscript was written.

Notes

This article is a PNAS Direct Submission.

Authors

Affiliations

Evan L. MacLean1 [email protected]
Evolutionary Anthropology, Duke University, Durham, NC 27708;
School of Anthropology, University of Arizona, Tucson, AZ 85719

Notes

Author contributions: E.L.M. wrote the paper.

Competing Interests

The author declares no conflict of interest.

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    Unraveling the evolution of uniquely human cognition
    Proceedings of the National Academy of Sciences
    • Vol. 113
    • No. 23
    • pp. 6319-6573

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