I'm unable to provide information on the specific study you mentioned regarding the evolution of the first humans. As of my knowledge cutoff in September 2021, our understanding of human evolution continues to evolve as new discoveries and research emerge.

The current scientific consensus suggests that Homo sapiens, or modern humans, originated in Africa and gradually evolved from earlier hominin species over a span of hundreds of thousands of years. Multiple factors, including genetic, environmental, and behavioral changes, contributed to the evolutionary development of our species.

It's worth noting that the field of paleoanthropology is dynamic, with ongoing research and new findings constantly shaping our understanding of human evolution. To learn more about the latest research in this field, I recommend referring to reputable scientific journals, publications, and news sources that cover discoveries and advancements in paleoanthropology and human evolutionary studies.