From this fact, ancient Japan is considered to have formed an integral cultural sphere including southeastern Asia and southern China, which viewpoint is claimed now by "Shoyojurin-bunkaron" (a theory of cultural sphere marked by laurel forests) and others.
このことから、古代日本の文化は、東南アジアから中国南部にかけての地域と、一体の文化圏を築いていたという見方もある（照葉樹林文化論など）。