We are all affected by what we experience on a daily basis. Even if you’re living under a bridge, your brain is reacting to outside stimuli moment by moment. Brain re-activity is not excluded to only those who are informed or in-the-know.
Any big idea that is held in the collective consciousness of the planet creates a physical atmosphere within the brain to accommodate the idea. It is not necessary to agree with the idea at large, but to allow yourself to review and create something useful from it, similar to 3d scanning an object and printing a modified duplicate. In fact belief is a few steps down the line when viewing what happens to the brain when initially introduced to a concept.
Any big idea will actually grow dendrites (connective pathways) in important parts of the brain, with or without our permission to do so. Scientists have discovered that big ideas like peace, compassion, love make for a better brain. Ideas can increase memory and consciousness or can increase or decrease anxiety, depression or anger.