The noosphere is a philosophical concept: a collective sphere of consciousness where our minds interconnect, which may explain why similar inventions independently popped up around the same time.

The concept of a global collective consciousness is a philosophical construct with validity, especially in today's world where ideas travel so fast we have become a giant thinking organism.

The "noûs" in noosphere is the same νόος you find in "noetics", the study of the mind—not to be confused with neuroscience, the study of the brain.

A proposed neologism: noégraphie / noegraphy, the study and practice of mapping thoughts and ideas.