Any supposed scientific reports you've read that use the word "subconscious" are immediately suspect. That's not how cognitive neuroscientists theorize about the control of attention. The use of the term "subconscious" brings us away from science to a much discredited psychoanalytic tradition. A scientific term would be "pre-attentive processes," but such processes by no means control conscious attentive processes.
Theories of evolution are about physical, structural development, not cognitive development Anything you might believe about communication somehow being "explained" by the theory of evolution is pure conjecture.