To my knowledge the only thing that is remotely near to what you are trying to say is that the heart doesn't totally rely upon the brain to define when to beat. You see technically the brain outputs a constant signal to the heart to define when to beat, this is important when exercising or needing the correct reaction in an emergency. However if it was the only thing that definite the beat, you could suffer a heart attack through just fright alone. (Since fright would undermine the signal's timing).
This is where the heart actually has a nerve reaction that can beat for a short while without the brains interaction, this basically acts to "buffer" against missing a beat.
Obviously this isn't exactly stating that the heart thinks, as it doesn't, however it is stating that it is capable of maintaining a function that the brain is used usually to do. (Somebody with the terminology will likely cover this further.)