“Cats can differentiate between voices, but they continue to show a ‘don’t care’ attitude even when their owners are calling, a study by Japanese researchers found. The team, led by Atsuko Saito, a researcher of comparative cognitive science at the University of Tokyo, observed 20 pet cats at their homes for eight months. They studied how the cats reacted to the voices of their owners and strangers through a method widely used in scientific studies to evaluate the cognitive abilities of infants and animals. The results showed that 50 percent to 70 percent of the cats turned their heads — a typical reaction to a sound — when they heard a human calling. Thirty percent moved their ears.