We've got a small army of philosophers of mind, and then another of neuroscience researchers working on this stuff.

But the philosophers don't have a ton to do without more experiments from neuroscience, and neuroscience is doing the best it can with currently available technology.

Studying the brain is really friggin' hard. I don't know where exactly you think the low-hanging fruit is, but trying to measure a brain operating at a neural level without killing it is pretty limited by our current tech.