To elicit anger a researcher pretended to be a criminal causing Mal to snarl. The photographs were then shown to 50 volunteers who were split into two groups according to their experience of dogs.
Wanasayansi hao wanasema, kwa wastani wapenzi wanapolala pamoja huwa na usingizi duni kwa asilimia 50 kwa sababu ya kuamshana amshana na hali hiyo huwa tofauti wakati wanapolala peke yao.