[ Your Name ] would like to inform you about this article on Complexity Digest 2008.26 - 11 http://comdig.unam.mx/index.php?id_issue=2008.26#30547 26-June-2008 [ Your Message ] PDF files of our annual editions are available at http://www.comdig.de/AnnualEditions.html A letter from Gottfried Mayer to our readers and friends is at http://www.comdig.de/GMLetter.html Animal Behaviour: Token Symbolism, Nature Excerpts: (...) trained five monkeys to associate a particular token - such as a green chip, black plastic tube or a brass hook - with one of three specific types of food. They then gave the monkeys a series of choices, each time between different amounts of two food items or between two types of token. Source: Animal Behaviour: Token Symbolism[ http://www.nature.com/nature/journal/v453/n7198/full/453960d.html ], DOI: doi:10.1038/453960d, Nature 453, 960, 08/06/19 You can discuss this article on Articles Forum http://comdig.unam.mx/topic.php?id_article=30547