Bruna Romanelli Posted almost 2 years ago When we think we have no options, can we change our perception? Does having options make us happier? mm I agree.. http://www.ppc.sas.upenn.edu/cvabs.htm http://www.annualreviews.org/doi/abs/10.1146/annurev.me.23.020172.002203 This study shows that dogs that can´t control the shock they are receiving are more susceptible to depression. unfortunately you have to pay $20 to read it =. But in the first link I think u can have a good perception of this. I din´t remember the TED video I saw it, sorry.