No Joke: Rats repeatedly watching conspecific receiving painful shocks responded less strongly and started YAWNING! http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0136979 …
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No Joke: Rats repeatedly watching conspecific receiving painful shocks responded less strongly and started YAWNING! http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0136979 …