| Balkenius,Gardenfors,Hall, The Origin of Symbols in the Brain, 2000 | :: | 1 |
| Cangelosi,Greco,Harnad, Symbol Grounding and the Symbolic Theft Hypothesis, 2002 | :: | 6 |
| Cangelosi, Evolution of communication and language using signals, symbols, and words, 2001 | :: | 27 |
| Ferrer-i-Cancho, When language breaks into pieces: A conflict between communication through isolated signals and language, 2006 | :: | 1 |