s****r
发帖数: 5546 | 1 http://www.msnbc.msn.com/id/28112599/
Canines, like people and monkeys, seem to have a sense of fairness
"The dog on the left has not received food for giving the paw in the last
trials and observing that the partner (right) did receive food, the subject
is refusing to give the paw and avoids looking at the experimenter." |
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