Unusual fluctuations within the brainstem lightpipe ganglion conduit on the latest creature. Basically a protein enhanced fiber optic bus, the ganglion conduit allows a steady current into the brainstem regardless of variables in the metabolic rate. Environmental influences can vary the metabolic rate, the creatures perform better with mammalian or 'warm blooded' metabolisms than a metabolism that mimics reptilian or a 'cold blooded' nature. Either design has it's pros and cons, it's just easier to deal with an agitated ape than an agitated dragon.
