An 8-year longitudinal study of mirror self-recognition in chimpanzees (Pan troglodytes)

@article{Veer2003An8L,
  title={An 8-year longitudinal study of mirror self-recognition in chimpanzees (Pan troglodytes)},
  author={Monique W. De Veer and Gordon G. Jr. Gallup and Laura Theall and Ruud van den Bos and Daniel J. Povinelli},
  journal={Neuropsychologia},
  year={2003},
  volume={41},
  pages={229-234}
}
In a previous cross-sectional study of mirror self-recognition involving 92 chimpanzees, Povinelli et al. [Journal of Comparative Psychology 107 (1993) 347] reported a peak in the proportion of animals exhibiting self-recognition in the adolescent/young adult sample (8-15 years), with 75% being classified as positive. In contrast, only 26% of the older animals (16-39 years) were classified as positive, suggesting a marked decline in self-recognition in middle to late adulthood. In the present… Expand
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