Majid Beshkar wrote:
> What is the lowest-order animal, in terms of phylogenetic hierarchy, endowed with associative learning (i.e., classical and operant conditioning)? In other words, where in phylogenetic hierarchy does the capability for associative learning arise?
The nematode worm, C. elegans, exhibits conditioned "taste aversion".
http://www.hhmi.org/news/bargmann3.html
But wait, this just in....
http://www.biologiateorica.it/papers/05papers.htm
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Joe Legris