Primate laterality and the biology and evolution of human handedness: a review and synthesis
Article first published online: 30 APR 2013
© 2013 New York Academy of Sciences.
Annals of the New York Academy of Sciences
Volume 1288, The Evolution of Human Handedness pages 70–85, June 2013
How to Cite
Fitch, W. T. and Braccini, S. N. (2013), Primate laterality and the biology and evolution of human handedness: a review and synthesis. Annals of the New York Academy of Sciences, 1288: 70–85. doi: 10.1111/nyas.12071
- Issue published online: 6 JUN 2013
- Article first published online: 30 APR 2013
- SOMACCA. Grant Number: #230604
- cognitive biology;
- comparative biology;
We review evidence for and against lateralization of manual control, communication, visual processing, and auditory processing in nonhuman primates. Compared to humans and some other vertebrate species, manual specialization in nonhuman primates is relatively weak. A right-bias in chimpanzees may exist, but is so weak that many studies using simple tasks fail to reveal it. Slightly stronger biases may exist in baboons and chimpanzees for communicative signals in the manual and facial domains. Several studies have found robust visual side biases that depend on the object being viewed, in primates including chimpanzees. Evidence for lateralization of auditory processing remains inconclusive. We conclude that the robust, species-wide lateralization that exists in humans is unusual, and perhaps unique among primates, and discuss several possible evolutionary explanations for this strong asymmetry. In particular, we consider the hypothesis that preexisting hemispheric asymmetry for perception and language processing drove the evolution of human handedness.