(a) BDNF concentrations in selected brain areas. Levels of BDNF measured in prefrontal cortex, striatum, hypothalamus and hippocampus, in mice belonging to emotional contagion resistant (ECR) and emotional contagion prone (ECP) subgroups. (b) Oxytocin concentrations in selected brain areas. Levels of the neuropeptide oxytocin measured in prefrontal cortex, striatum, hypothalamus and hippocampus, in mice belonging to ECR and ECP subgroups. * p < 0.05, ECR vs ECP. (c) Vasopressin concentrations in selected brain areas. Levels of the neuropeptide vasopressin measured in prefrontal cortex, striatum and hippocampus, in mice belonging to ECR and ECP subgroups. * p < 0.05, ECR vs ECP.