http://lljcwddkoyjq3xxtchl7a4i3ig6wqrg7nfxuzbzj4k4tbnb6pnzq7kid.onion/index.php?title=Animal_cognition&oldid=771
                                
                                
                                                                            After they had learned this task fairly well, the outcome was reversed: items in set B led to food and items in set A did not. Then the outcome was reversed again, and then again,  and so on.   Vaughan found that after 20 or more reversals,  associating reward with a few pictures in one set caused the birds to respond to the other pictures in that set without further reward, as if they were thinking "if these pictures in...