Numerical memory span in a chimpanzee

The magical number seven, plus or minus two: Some limits on our capacity for processing information.

George Miller · Psychological Review · 1956 · 17.5K citations

Social Sciences, Psychology, Social Psychology +10

Ordering of the Numerosities 1 to 9 by Monkeys

Elizabeth M. Brannon, H. S. Terrace · Science · 1998 · 700 citations

Social Sciences, Neuroscience, Psychology +17

Use of numbers by a chimpanzee

Tetsuro Matsuzawa · Nature · 1985 · 577 citations

Social Sciences, Biology, Zoology +10

Summation in the chimpanzee (Pan troglodytes).

Duane M. Rumbaugh, Sue Savage‐Rumbaugh, Mark T. Hegel · PubMed · 1987 · 191 citations

Social Sciences, Behavioral Sciences, Psychology +14

Numerical ordering in a chimpanzee (Pan troglodytes): Planning, executing, and monitoring.

Dora Biro, Tetsuro Matsuzawa · Journal of comparative psychology · 1999 · 111 citations

Social Sciences, Biology, Zoology +12