A study in this issue reports that mice can be fear conditioned through observation of other mice receiving aversive stimuli and identifies some of the brain regions involved in this observational fear learning.
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Grenier, F., Lüthi, A. Mouse brains wired for empathy?. Nat Neurosci 13, 406–408 (2010). https://doi.org/10.1038/nn0410-406
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DOI: https://doi.org/10.1038/nn0410-406
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