Experience Modulates Vicarious Freezing in Rats: A Model for Empathy Atsak, Piray ; Orre, Marie ; Bakker, Petra ; Cerliani, Leonardo ; Roozendaal, Benno ; Gazzola, Valeria ; Moita, Marta ; Keysers, Christian Abstract Publication: PLoS ONE Pub Date: July 2011 DOI: 10.1371/journal.pone.0021855 Bibcode: 2011PLoSO...621855A