Ashes of Victory, Chapter 3 wrote:"We've wondered for centuries why the 'cats spinal cords have those clusters of nervous tissue at each pelvis," he told her. "Some have theorized that they might be something like secondary brains. They're certainly large enough, with sufficiently complex structures, and the theory was that they might help explain how something with such a relatively low body mass could have developed sentience in the first place. Others have derided the entire idea, while a third group has argued that even though they may be secondary brains, the physical similarities—and differences—between them indicate that they must do something else, as well. Their structures have been thoroughly analyzed and mapped, but we've never been able to link them to any discernible function. But, then, no one ever had a 'cat expert quite like you available for consultation, Honor. Now I think we know what at least one of those super-ganglia do."
A terrestrial analogue for treecat brain physiology?
How the octopus got its smarts