Yes, back to square one. It is a tough one to nail down.
How about empathy? I mean, do you think its a learned response that we humans do not have to convince one another on each unique encounter that we share the same 'experience'? "Heart" is not necessarily the pump that slushes blood around the body. > Would beings of lesser consciousness, such as dogs, insects, etc, be tapping into the same field? Well, according to a few belief systems (that I know of), all sentient beings have a measure of consciousness. (I personally draw the line at insects ;) In my (layman but not necessarily humble :) opinion, the brain is metabolising information. (Doesn't the nervous system remind you of a plant?) There is a network of info pathways and in our case it happens to be chemically mediated and compactly localized. Who is to say the Galaxy itself is not conscious? (Photons, quantum effects, who knows?) (c.f. "body" of Gelertner's essay.) As long as there is a 'cohesion in time' -- body -- and means of propagation of stimuli, one supposes a 'mind' can spring up at any scale in this universe. I simply think the notion of a black-box "mind" reduces us to mere chemicals caught up in the stream of time. No self respecting sentient should ever accept that! :)
No. At least I am not so skeptical. :) Based on experience, I think we start with the assumption that we do share the same experience. Only occasionally, will you find that someone is mentally ill, deficient, or intoxicated, and then consider the experience may not be a shared one. Personally, I think intelligence is in a large part granted, maybe near as much as it is earned. We have this vacuuming robot at home, it scurries along the floor, works its way around table legs, avoids the stairs, and senses walls. When its battery is low, it finds its docking station and recharges itself. Oddly, even this very limited display of 'intelligence' has caused my wife and I to name it Willy, and to refer to it as 'him'. If we come home and find him caught under something, we'll say "Oh no, Willy what happened to you?" To tell you the truth, as much as I know that our vacuum isn't sentient, I'd feel different taking a hammer to it, than I would our toaster. Maybe you have granted me more than I deserve, just based on some clever text? :)