Neuroscientist, Michael Egnor, weighs in on some of the problems with explaining abstract thought by material means. He explains the contradictions that result from saying the mind arrises through complex neural activity.
Can Materialism Explain Abstract Thought?

I had the pleasure of spending many hours with Dr. Erika Erdman, a research assistant to Dr. Sperry. Her interpretation of his work was that the immaterial part of the mind was an emerging evolutionary property. Of course, she had no genetic or biological mechanism to explain that emergence.
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