New answers tagged animal-cognition
You could start with Hochner's papers, like this one: Hochner, B., Shomrat, T., & Fiorito, G. (2006). The octopus: a model for a comparative analysis of the evolution of learning and memory mechanisms. The Biological Bulletin, 210(3), 308-317. http://www.biolbull.org/content/210/3/308.full As far as I know, he is a world expert.
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