Contrary to previous views, major advances in stone tool technology occurred after Homo sapiens crossed Eurasia, not before, marking a complex evolutionary journey. A study led by researchers at the Nagoya University Museum in Japan may change our understanding of cultural evolution as Homo sapiens spread across Eurasia some 50,000 to 40,000 years ago. The findings challenge traditional ideas about the timing and nature of cultural transitions during this critical period in human history.
Publishing their insights into stone tool technology in the journal Nature Communications, the researchers suggest that the cultural and technological "revolution" commonly thought to have propelled anatomically modern humans beyond Neanderthals and other ancient humans was actually a more subtle and complex process of cultural evolution.
The research team focused on the Middle-Upper Paleolithic (MP-UP) cultural transition, an important dividing line between two key stages in human evolution:
During the Middle Paleolithic (250,000 to 40,000 years ago), anatomically modern humans coexisted with Neanderthals and archaic humans. Culturally, anatomically modern humans and Neanderthals shared similar stone tool technologies, such as using the "Levalois method" of tool making, which involves striking stones with a hammer-like tool.
The Upper Paleolithic (50,000 to 12,000 years ago) was a period of widespread geographic expansion of anatomically modern humans and the extinction of ancient humans. During this period, new cultural elements emerged in various areas, including tool technology, food acquisition, navigation, and artistic expressions such as ornamentation and cave art.
Traditionally, scholars believe that the MP-UP transition is a sudden change marked by the revolutionary emergence of new cultural elements. For example, suppose that Homo sapiens had a sudden neurological mutation that resulted in superior cognitive abilities. This change allowed them to eventually surpass other ancient humans and drive the Neanderthals to extinction. However, this study challenges this paradigm.
The researchers examined the productivity of edged stone tools over a 50,000-year time span across six cultural stages, from the Middle to Upper Paleolithic, Upper Paleolithic, and Upper Paleolithic. They found that large increases in innovative productivity did not occur before or at the beginning of Homo sapiens' widespread spread across Eurasia. Instead, large increases in innovative productivity occurred after the initial spread of Homo sapiens and coincided with the development of blade technology in the Early Paleolithic.
This result suggests that cultural change is a complex process involving multiple stages rather than a single 'revolution'.
Lead researcher Professor Kadowaki Seiji believes that the cultural transformation from the Middle Paleolithic to the Upper Paleolithic is a complex evolutionary process involving multiple aspects and changing over a long period of time. He said: "In terms of cutting-edge productivity, Homo sapiens did not begin to spread to Eurasia after the rapid innovation of stone tool technology. Instead, the innovation of 'cutting-edge' productivity occurred later and was carried out simultaneously with the miniaturization of stone tools such as blades."
Compiled source: ScitechDaily