There is a lot of debate surrounding why cats respond to pspspsps, with many people believing that it is simply because they enjoy the sound. However, there may be another explanation. Cats have unique hearing abilities and can hear frequencies that are higher than those audible to humans. When you make a noise like pspspsps, you are actually creating a vibration at a frequency that is similar to that of a cat's purr. This means that when you make this noise, your cat may interpret it as if you are trying to communicate with them through purring.