Trust rather than lust is at the heart of the attention to detail and finely made form of handaxes from around 1.7 million years ago, according to a University of York researcher.
Dr Penny Spikins, from the Department of Archaeology, suggests a desire to prove their trustworthiness, rather than a need to demonstrate their physical fitness as a mate, was the driving force behind the fine crafting of handaxes by Homo erectus/ergaster in the Lower Palaeolithic period.
Dr Spikins said: "We sometimes imagine that early humans were self-centred, and if emotional at all, that they would have been driven by their immediate desires. However, research suggests that we have reason to have more faith in human nature, and that trust played a key role in early human societies. Displaying trust not lust was behind the attention to detail and finely made form of handaxes."
The 'trustworthy handaxe theory' is explained in an article in World Archaeology and contrasts sharply with previous claims that finely crafted handaxes were about competition between males and sexual selection.
Dr Spikins said: "Since their first recovery, the appealing form of handaxes and the difficulty of their manufacture have inspired much interest into the possible 'meaning' of these artefacts. Much of the debate has centred on claims that the attention to symmetrical form and the demonstration of skill would have played a key role in sexual selection, as they would have helped attract a mate eager to take advantage of a clear signal of advantageous genes.
"However, I propose that attention to form is much more about decisions about who to trust; that it can be seen as a gesture of goodwill or trustworthiness to others. The attention to detail is about showing an ability to care about the final form, and by extension, people too.
"In addition, overcoming the significant frustrations of imposing form on stone displays considerable emotional self-control and patience, traits needed for strong and enduring relationships."
Handaxes, or bifaces, appeared around 1.7 million years ago in Africa and spread throughout the occupied world of Africa, Europe and western Asia, functioning primarily as butchery implements. Handaxe form remained remarkably similar for more than a million years.
Dr Spikins said: "Trust is essential to all our relationships today, and we see the very beginnings of the building blocks of trust in other apes. The implication that it was an instinct towards trust which shaped the face of stone tool manufacture is particularly significant to our understanding of Lower Palaeolithic societies. It sets a challenge for research into how our emotions, rather than our complex thinking skills, made us human.
"As small vulnerable primates in risky environments where they faced dangerous predators our ancestors needed to be able to depend on each other to survive -- displaying our emotional capacities was part of forming trusting relationships with the kind of 'give and take' that they needed."
Dr Spikins points to other higher primates, particularly chimpanzees, as well as modern human hunter-gatherers to back up her theory of trustworthiness.
"Long-term altruistic alliances in both chimpanzees and humans are forged by many small unconscious gestures of goodwill, or acts of altruism, such as soothing those in distress or sharing food," said Dr Spikins.
"As signals of trustworthiness, these contribute to one's reputation, and in hunter-gatherers reputation can be the key to survival, with the most trustworthy hunters being looked after most willingly by the others when they are ill or elderly.
"The form of a handaxe is worth considerable effort, as it may demonstrate trustworthiness not only in its production, but also each time it is seen or re-used, when it might remind others of the emotional reliability of its maker."
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