When humans became human: a new study

However, archaeologist Huw S. Groucutt believes that this picture is too simplistic. In his new work, he argues that human evolution was not a sudden revolution, but a long, uneven and complex process. The various characteristics of ‘modern’ humans did not appear simultaneously, but at different times and in different places.

The study has been published in the journal Quaternary Science Reviews.

Details

The idea of the so-called ‘human revolution’ has long been debated in archaeology. According to this theory, a sharp turning point occurred around 50,000 years ago: humans began to think and behave almost exactly as we do, rapidly spread beyond Africa, and started creating more complex tools, jewellery, images and symbols.

This idea is convenient because it offers a simple narrative: first there were ancient humans with simpler behaviour, then a ‘eureka moment’ occurred — and modern Homo sapiens emerged.

But, according to Groucutt, the actual evidence tells a different story. Archaeological finds reveal not a single sudden leap, but a multitude of separate changes. Some complex technologies appeared earlier, then disappeared. Ornaments, bone tools, specialised hearths and other signs of complex behaviour emerged in different regions at different times.

Put simply, modern humans did not emerge as a ready-made set of characteristics. They developed gradually.

The same applies to anatomy. The features that scientists call ‘modern’ did not all appear at once either. Some features of the skull and face are found in very ancient finds, whilst others retain a more archaic appearance much later. Therefore, the term ‘anatomically modern human’ is not always as clear-cut as it seems.

Genetics also complicates the picture. Current data point not to a single, simple wave of migration out of Africa, but to a more complex history: different groups of people dispersed, intermingled, disappeared and left their mark on genomes. Homo sapiens evolved in interconnected but distinct populations.

Dating presents a separate problem. Many finds of ancient humans and sites have a wide range of possible ages. Sometimes the age of a bone is not determined directly, but by the surrounding layer, stone tools or minerals found nearby. This does not render the dating useless, but it does require caution.

Groucutt emphasises: if we tell the story of Homo sapiens based solely on bones, we get one version. If based solely on tools, another. If based solely on genetics, a third. Therefore, one cannot select only those data that fit neatly into a neat narrative of a sudden ‘revolution’.

Why this matters

The main conclusion of the research is that humans did not become human in a single historical moment. There was no magic button that suddenly switched on the modern mind, art and complex society.

This is important because it changes our view of ourselves. Homo sapiens turned out not to be the result of a single sudden leap, but a species with a long and varied history. Our abilities developed gradually: through experimentation, successful and unsuccessful technologies, interactions between groups, environmental changes and the accumulation of culture.

This perspective makes human history less spectacular, but more realistic. Evolution rarely follows a straight line. It is more like a mosaic: different parts of the picture appear at different times, some disappear, and then similar solutions emerge again.

For science, this is also a reminder: human origins cannot be explained by a single find, a single date or a single theory. We need the bigger picture, one that takes into account bones, DNA, stone tools, jewellery, sites and traces of behaviour all together.

Background

Homo sapiens originated in Africa, and this remains the prevailing scientific view. But the question of exactly when humans of our species became ‘modern’ in their behaviour remains a matter of debate.

Previously, the idea of the ‘Upper Palaeolithic Revolution’ was particularly influential. It was linked to the rapid spread of new technologies, art and symbolic behaviour around 50,000 years ago, particularly in Europe. Later, as more data from Africa became available, it became clear that many complex forms of behaviour had emerged there much earlier.

For example, shell ornaments, ochre processing, bone tools and other signs of complex culture appear in the archaeological record not as a single package, but in separate bursts. This does not fit well with a model of a sudden leap.

This new work continues this debate and calls for us to move away from an overly simplistic narrative. The author suggests viewing the evolution of Homo sapiens as a gradual, regionally varied and complex process.

Source

Study: Huw S. Groucutt, ‘Revolution, modernity, and the dispersal of Homo sapiens beyond Africa’, Quaternary Science Reviews, 2026.