DBT
Contributor
The brain is an organ just like any other, and is only one component of the broader nervous system. Beliefs, reasoning, assumptions, reactions, memory and so forth are components of that system, and to a very large extent they all work in concert. Unless you are trying to invoke magical concepts like a supernatural "higher self", beliefs are no more and no less "physical" than any physiological response, both responding to and directing other neurological activities and hormonal releases. You are not describing the functioning of that system accurately.The brain and senses evolved according to physical conditions in the world, not belief.
I am merely pointing out that the physical world, including the brain its workings are not reliant on belief to exist and function.
Moreover;
''Why not say that knowledge is true belief?
The standard answer is that to identify knowledge with true belief would be implausible because a belief that is true just because of luck does not qualify as knowledge. Beliefs that are lacking justification are false more often than not. However, on occasion, such beliefs happen to be true.
The analysis of knowledge may be approached by asking the following question: What turns a true belief into knowledge? An uncontroversial answer to this question would be: the sort of thing that effectively prevents a belief from being true as a result of epistemic luck. Controversy begins as soon as this formula is turned into a substantive proposal.
According to evidentialism, which endorses the JTB+ conception of knowledge, the combination of two things accomplishes this goal: evidentialist justification plus degettierization (a condition that prevents a true and justified belief from being "gettiered"). However, according to an alternative approach that has in the last three decades become increasingly popular, what stands in the way of epistemic luck, what turns a true belief into knowledge is the reliability of the cognitive process that produced the belief. Consider how we acquire knowledge of our physical environment: we do so through sense experience. Sense experiential processes are, at least under normal conditions, highly reliable.
There is nothing accidental about the truth of the beliefs these processes produce. Thus beliefs produced by sense experience, if true, should qualify as instances of knowledge. An analogous point could be made for other reliable cognitive processes, such as introspection, memory, and rational intuition. We might, therefore, say that what turns true belief into knowledge is the reliability of our cognitive processes.''