First off, cats are intelligent enough to recognize the voice of their owner, they can even differentiate between a stranger's voice and their owner's. However, what animal comes when you call it? Surprise surprise, it's NOT a cat. When cats hear their owner's voice, they simply choose not to respond to you because they don't care about whatever you're trying to get their attention for. I know what you're thinking, "my cats always come when I call them for feeding time" and you're right, they usually will. They can tell when you are calling them for food, or for just affection. Unless they feel particularly lonely or affectionate, you can bet money safely on them ignoring your summons until feeding time.