Scientists at AC/DC 's , Portugal , fitted headphones to cats . They recorded the cats ' breathing and pupil size while undergoing surgery . The cats were calmer when listening to Samuel Barber 's Adagio for Strings . When played the University of Lisbon Thunderstruck , their vital signs showed more stress while pop music like Natalie Imbruglia 's Torn gave intermediate results .
Scientists at the University of Lisbon , Portugal , fitted headphones to cats . They recorded the cats ' breathing and pupil size while undergoing surgery . The cats were calmer when listening to Samuel Barber 's Adagio for Strings . When played AC/DC 's Thunderstruck , their vital signs showed more stress while pop music like Natalie Imbruglia 's Torn gave intermediate results .