I'm not a native, so: might be better / should be better
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[...] adults are using only a small part of their brain. [...]

You adults obviously know that what you are sitting on is a chair, what you are wearing are clothes and what you are breathing is air. But it's not correct actually./But actually, that's not correct. There is just stuff made out of molecules in the world. We just made up boundaries, named them and classified them "in our brain". To tell the truth, there are no boundaries in the world. When we exercise/do exercises water seeps out of our skin, we sweat, and the water leaves our skin and becomes a vapor. [...] and seeps into you. This world is continuous. We are just making up boundaries and are naming each of them to understand this continuous world. This classification has helped/been helping us to do intellectual activities.

[...] so they cannot concentrate on only one part of their signals/the signals they receive. They are concentrating on everything. (Which is not concentrating at all, is it? :D) [...] We adults are processing the information we get from the world by using our brain. It is a good thing, but it also has a bad effect. The processing keeps us in an ordinary frame of understanding. [...]