French to English Social Sciences Anthropology visual anthropology

Mead definissait l'anthropologie visuelle comme: l'etude de l''homme dans ce qu’il donne seulement à voir et qu’on appréhende par des outils d'investigation non verbaux

This is actually a bad situation- this is a French translation of the original English statement and now the original quote has been 'misplaced' and cannot be found! Solution is to retranslate it back into English and remove the direct quotation marks. Bearing this in mind, I think a more literal aproach would be best but am hesitating on the wording... Any suggestions? Thanks!