Our own experience provides the basic material for our imagination, whose range is therefore limited. It will not help to try to imagine that one has… - Thomas Nagel

Bats … present a range of activity and a sensory apparatus so different from ours that the problem I want to pose is exceptionally vivid (though it certainly could be raised with other species). Even without the benefit of philosophical reflection, anyone who has spent some time in an enclosed space with an excited bat knows what it is to encounter a fundamentally alien form of life.

I believe that there is a necessary connection in both directions between the physical and the mental, but that it cannot be discovered a priori. Opinion is strongly divided on the credibility of some kind of functionalist reductionism, and I won't go through my reasons for being on the antireductionist side of that debate. Despite significant attempts by a number of philosophers to describe the functional manifestations of conscious mental states, I continue to believe that no purely functionalist characterization of a system entails — simply in virtue of our mental concepts — that the system is conscious.

Perhaps there is one chain [of inference] leading from the mental and the physical to a common source. It is conceivable in the abstract that if mental phenomena derive from the properties of matter at all, these may be identical at some level with nonphysical properties from which physical phenomena also derive. …<p>If there were such properties, they would be discoverable only by explanatory inference from both mental and physical phenomena. … There would be properties of matter that were not physical from which the mental properties of organic systems were derived. This could still be called panpsychism.