the rats of NIMH
2011-May-01, Sunday 04:11 amI haven't seen it mentioned elsewhere yet, but researchers have boosted the "intelligence" of mice by increasing the growth of their hippocampus. These engineered mice made better choices by improving their discrimination between similar situations, in effect "learning" more effectively.
http://www.technologyreview.com/biomedicine/37288/?p1=MstRcnt&a=f
http://www.technologyreview.com/biomedicine/37288/?p1=MstRcnt&a=f