More by Dunbar here: http://www.lel.ed.ac.uk/~simon/Papers/Kirby/The%20Evolution%20of%20Language.pdf http://www.lel.ed.ac.uk/~simon/Papers/Kirby/The%20Evolutio

More by Dunbar here: http://www.lel.ed.ac.uk/~simon/Papers/Kirby/The%20Evolution%20of%20Language.pdf http://www.lel.ed.ac.uk/~simon/Papers/Kirby/The%20Evolution%... and https://arxiv.org/pdf/1604.02400.pdf https://arxiv.org/pdf/1604.02400.pdf