The first stone tools were made at least about 2,5 million years ago. In fact, as the tools modify the environment, they signify the first appearance of humanity, even though modern humans did not even exist then. How is it possible? Well, it is because humanity, in the broad sense, has not been a feature of modern humans only. Actually, humanity used to be a rare disorder of all homo species. Naturally there are no traces of this in the fossils, but indirect signs can still be seen in the stone tools. The path of the evolution of homo species is embellished with the small stones of humanity, so to speak. All these stones tell the same story, but the story is not the one of the entire population, but only of the few. It is the story of the random unfit individuals who took the destiny in their own hands and, in the dark, began a silent rebellion which unexpectedly broke out into a revolution only much later.
The key to human specialty is not anatomical and therefore not directly found neither in fossils of early species nor in the bodies of the living people. The key is in the psyche and so well hidden that even the scientific research has so far not recognised it. The key is inheritable and due to a a rare genetic disorder of the psyche. The genetic nature of the disorder explains how the trait could be so long just a rare and rather insignificant and then surprisingly turn into a dominant one. However, it is not rare anymore, on the contrary, it’s all over and may be too common to attract our attention. To explain it, it probably would be useful to introduce the term mentally modern human (MMH) and use it instead of anatomically modern human (AMH). The emergence of anatomically modern human (AMH) is a part of the long developmental cycle in which the importance of childhood has begun to be emphasised more strongly. Shifting focus from anatomy to psyche allows for a clearer determination of the chain of events of the emergence of modern humans.
Human specialty is more psychological than anatomical and so it actually cannot be seen with eyes only. It is possible that the juvenile-like psyche have had an effect on our appearance, such as body structure or childlike facial features, rather than vice versa. Nevertheless, the adolescent mind already existed well before we became fully anatomically modern humans.
The strange survival
The mysterious incubator of the human revolution was undoubtedly the ice age of over 200,000 years. It was the so-called Saale glaciation. In the northern hemisphere water was trapped in thick layers of ice, which in turn created a long and devastating drought in Africa. The drought is known to have reduced the population of the Heidelbergs to only a few thousand individuals, i.e. virtually to the brink of extinction. About 120,000 years ago the glaciation was pretty much over. As the ice receded, the population was still there, but barely the same size as the number of orang-utans today. We know that such a small community inevitably meant declining genetic diversity, which normally would have diminished the chances of survival. But strangely enough, this never happened. Instead, among the few thousand surviving Heidelbergs grew the first modern people. Research has not found an answer how this happened. Scientists have only stated the obvious fact that the “most viable” individuals, who survived the crisis, multiplied and eventually spread throughout the globe. It seems that the answer has to be traced in the hitherto unexplored process in which the recessive trait became dominated.
Evolution works in many ways. Natural selection and mutation tendency are two of them. However, our recent development cannot be only explained by these. In fact, we have one option: genetic drift. It is one of the mechanisms of evolution. It means a change in the genetic composition of a population due to random transfer of genes involved in the reproduction process. This type of microevolution refers to evolutionary changes within species boundaries and it can happen, for example, due to a bottleneck phenomenon. We know that man did not show up in Africa out of nowhere, but is a descendant of the Heidelbergs. So the transformation of the Heidelbergs into a modern human community probably meant that the individuals with a hereditary growth disorder were the only ones who survived the drought. In other words, all of their normally developing partners died. The extinction of our normal ancestors meant the birth of modern humans as “a half species”. As the defected individuals outbred normal Heidelbergs, the recessive trait soon superseded the original, dominant trait. And when the dominant feature finally disappeared, the population became fully “domesticated”. And that meant the juvenile-like psyche becoming the new normal. It also marked the only significant difference between early human species and modern human: the permanent consciousness.
The surviving Heidelbergs gradually formed a more homogeneous population which would be the basis of the modern human population. Its genetic lineage became narrower than that of normal Heidelbergs. Modern human was not a result of natural selection, but as a result of genetic drift caused by environmental crisis. One might ask whether homo sapiens could be called a new species at all. At least it did not change at the species level. What changed was status of the abnormality: it became normal. Unfitness kept the new Heidelberg-sapiens alive, but at the same time it isolated them from nature and halted their evolution. Fortification to humanity caused constant struggle against nature and all normal change in nature. We were locked in the cage of childhood.
1) The mental growth disorder: The gradual spread of the mental growth disorder among homo species began possibly as long as 3,2 million years ago, but at least 2,5 million years ago. It began as a recessive trait, meaning it was rare and carried only by few individuals. Already the first stone tools reflect the full growth disorder. The disorder can also be seen in fire making, clothing and the early human migrations out of Africa.
2) The Bottleneck effect: The mental growth disorder of homo species remained relatively small in quantitative terms until the devastating environmental conditions in Africa led its increase in Heidelberg’s population +120,000 years ago. The huge drought caused by the Ice Age in the northern hemisphere made the normal dominant feature of our genome disappear. Thus, homo sapiens is not the result of natural selection, but of genetic drift. According to general knowledge, “genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It can also cause initially rare alleles to become much more frequent and even fixed”. This is what seems to have happened in Africa i.e. the dominant trait/gene disappeared, and the recessive trait/gene became the dominant one. According to this, the hypothesis of multiregional evolution of modern humans seems unlikely.