If the chemicals are frenetically interacting among themselves giving rise to human intellect, is it competent to determine truth value of propositions?
People get bogged down when they start talking about truth, or absolute truth, or objective truth, or ultimate truth.
What matters about an idea is its usefulness in predicting and therefore at times controlling outcomes so that desirable outcomes are maximized and undesirable ones minimized. All we need to know is that we have preferences, and certain ideas facilitate their manifestation better than competing ideas, so we use those ideas.That's as close to truth as I can use.
Are the ideas that work true? Is Newton's theory of universal gravitation true? It's been improved upon since his day at least twice that I know of, once when Laplace solved the three-body gravitational problem, and then later with Einstein and relativity theory.
But Newton's ideas work for most practical applications, including the manned Apollo missions to the moon and back. Is Newton's work true? Do you see the problem there?
And a brain is well capable of deciding if an idea is useful.
We may say that Evolution did it. Even then the question remains did Evolution do it to make us competent to discern truth?
Evolution probably accounts for our reasoning faculty because of the competitive advantage it confers on those able to reason well, but it doesn't have a purpose or plan. It is a blind, undirected process caused by natural selection working on genetically varying populations over time.
If I look at the complexity of the brain, how is it possible that something reasonable comes out of this network? How is it possible that a face that I see or a thought that I have maintain their identity over time? If I have no access to what goes on in my brain, how can I be so proud, (how can anybody be so proud) about scientific achievements?
It's the complexity that makes reasoning possible. There are on the order of 100 billion neurons in the brain, roughly the same number as the number of stars in our galaxy and the number of galaxies visible from earth, as well as the number of human being that have been born, so don't expect a full understanding of how a brain generates a conscious mind any time soon.
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Each individual neuron can form thousands of links with other neurons in this way, giving a typical brain well over 100 trillion synapses (up to 1,000 trillion, by some estimates). Functionally related neurons connect to each other to form neural networks (also known as neural nets or assemblies)."
I'm proud of man's scientific prowess and achievements - making life longer, healthier, safer, more functional, easier, more comfortable, and more interesting for much of the world's inhabitants.
Religion, prayer, meditation have everyday benefits for scientists too
Religion and prayer offer no benefit for me. I've tested them. Nothing there.
As far as meditating goes, I am generally walking with eyes open when thinking to myself. This is a valuable activity. I don't call it meditation. It's contemplation - plain thinking.