As if it's something that needs to be proved by research evidence.
Researchers at the University of Sussex have recently "discovered" that cats "exploit" humans by using a "soliciting purr" to garner attention and food. What the research did was to train cat-owners to record both the "soliciting" and "non-soliciting" purrs of their cats. The recordings were played to volunteers, who found the "soliciting" purrs more pressing and less pleasing, and this pestering purr often convinced beleaguered pet lovers to give them what they want.
But do we really need this research study to tell? Ask us us who have our cats lording over us. Try closing the bedroom door and shutting those Lords of the House out, for instance, and see how you can bear with their protests!