In psychology there is differentiation between sensation and perception. Sensation is the reception of signal alone. Nothing about this signal is analysed. Perception is the stimuli analysed within the brain to make sense of it.
So Buddhism makes sense to call the mind (or brain) the sixth organ that brings together all the information into a coherent whole. To not distinguish an organ as Western thinking has done has been a disservice to their understanding. The reasoning behind this is partly due to the belief in the soul and by extension the mind. Western science and philosophy has had a tough time reconciling the mind in relation to everything else.
For Buddhism there is no mystery to the mind. It has no higher place separate from the rest of physiology. It is as much part of and impermanent as everything else.