I will admit that in the limited world of the study of consciousness there are no tools for studying emergent properties of the working of the brain. And by the way I am not arguing the mind is an immaterial thing. It is an overlay on the brain and depends on a working brain for its existence. Once something happens to the brain via toxic substances or other physiological trauma, the mind ceases to work properly. But until scholars of consciousness can provide a reasonable ontological link between brain action and self, other, and fiction, and reliably distinguish between them as a child of 7 or 8 does quite reliably and naturally, we are in the realm of metaphysics not science.
Perhaps self generated dualism is the best way to think about the relationship between the brain and the mind. It is true that the mind 'app' can be reduced to material actions of neuron activity, just as any app can be reduced to the the material changes in the state of silicon switches. But the meaning of the app is not found in the relationship of silicon switches, meaning is found in the usefulness of the app to the mind 'app' using it for whatever useful or useless thing the mind finds to do with the app.
The meaning of Facebook is not found in the material state of some server farm somewhere, it is found in the way real people can use it to stay connected to people who they may have no material connection with. I have never met in person several friends on Facebook, due to geographic limitations, but I would have no qualms about sharing an extended visit with any of them. Indeed, I have done so on a couple of occasions. (I will admit to be very selective in my friends list.)
Similarly the meaningful connection between you and me is not found in the state of the switches at the Silicon Valley and the Minneapolis ends of the fiber optic network, it is the way each of our minds works with the data represented by the states of those switches. Please note that the state of our brains is no more relevant than the state of those switches.
Scientists can not think about the issues of mind and meaning as scientists. They just don't have the necessary scientific tools. It remains firmly in the realm of philosophy probably more specifically phenomenology.
I can't prove, but suspect, that the brain processes the information about self, other in the real sense of a known other real person, and a fictional character like God made, after all, in the image of self in much the same way neurologically. All have faces, bodies, emotions, needs, likes, dislikes, etc, that I suspect are processed in the same brain spaces dedicated to tracking those things. But somehow a healthy rational mind can keep the differences sorted out correctly and is able to process information derived from each stored source in an appropriate manner. I am skeptical that the scientists will ever be able to distinguish the stored information about, for example God in a believer, from the stored information about self. Yet the mind does this quite reliably most of the time. Although some of the people posting here make one wonder about how reliable the mind is in this function.
3 months ago