Via the article I link to on Gizmodo:

For the most part, the experiments showed that the cats were able to distinguish their own name, even when the name was said by a complete stranger. All cats were equally good at distinguishing their names from general nouns.

However, if you read the article you’ll see the study does come in for some criticism and it may not be as clear cut as the scientists who organised this study claim.

I can see some difficulties in interpreting a cat’s responses. Cats do not see themselves as in any way inferior to humans. Quite the opposite in fact — they rule most households they live in.

It’s perfectly feasible that a cat would recognise it’s name just fine but simply cannot be bothered to grace the idiot human with any sort of response. It's a case of "Hey, you’re wasting your breath. I'll call you if I want something."