2. The theory of harlan Center-non-center theory(harlan, 1971 Three centers of origin Near east: N China: C. America Three non-centers: Africa SEASia: S America Harlan preferred regions of origin to centers of origin2. The theory of Harlan Center-non-center theory (Harlan, 1971) Three centers of origin: Near East; N.China; C. America Three non-centers: Africa; SE Asia; S. America Harlan preferred regions of origin to centers of origin