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Complex artefacts don't prove brilliance of our ancestors


Artefacts such as bows and arrows do not necessarily prove our ancestors had sophisticated reasoning and understanding of how these tools worked, new research suggests.

Complex artefacts don't prove brilliance of our ancestors
Artefacts such as bows and arrows do not necessarily prove our ancestors had sophisticated reasoning
and understanding of how these tools worked, new research suggests
[Credit: University of Exeter]
Instead, such items could have emerged from an "accumulation of improvements made across generations" -- with each generation understanding no more than the last.

The new study, by the University of Exeter and the Catholic University of Lille, does not question humanity's capacity for "enhanced causal reasoning" -- but argues this did not necessarily drive the development of technologies such as bows, boats and houses.

Researchers used "chains" of volunteers to tackle an engineering problem, with each volunteer able to learn from the last. Solutions improved with each "generation" -- but those at the end of the chain had no more understanding of key concepts than their predecessors.


"We tend to explain the existence of complex technologies by saying humans have big brains and superior causal reasoning abilities," said Dr Maxime Derex, of the University of Exeter and the Catholic University of Lille.

"But - as our study shows - you don't have to understand how something works in order to improve it. Artefacts from hundreds or thousands of years ago do not necessarily show that their makers had a plan or a theory about how something would work."

The study used 14 chains of five French university students, each aiming to optimise a wheel that rolled down a track -- moving faster or slower depending on the adjustment of moveable weights on its four spokes.

Complex artefacts don't prove brilliance of our ancestors
The participants could modify the position of 4 weights attached to the wheel's spokes, in an attempt to increase its speed
along the sloping rail. Two factors have an impact on this speed: the distribution of the mass around the wheel's axis,
or moment of inertia (the closer the weights to the axis, the greater its speed), and the position of the wheel's
centre of mass (the higher it is, the greater the acceleration) [Credit: Maxime Derex]
Each participant had five attempts to minimise the time it took for the wheel the reach the end of the track, and all but the first participant in each chain got details of the last two configurations used by the previous person.

Afterwards, researchers tested each participant's understanding by asking them to predict which of two wheels would cover the distance faster.

The study found: "The average wheel speed increased across generations while participants' understanding did not."

A further 14 chains of students completed the same process, but this time they could write down a theory to pass to the next participant.


Wheel speed rose at a similar rate as that seen in groups who passed on no written instructions, but once again understanding "barely changed across generations."

The researchers said: "Most participants actually produced incorrect or incomplete theories despite the relative simplicity of the physical system."

The findings prove the power of "cultural transmission, without the need for an accurate causal understanding of the system," they said.

"Our experiment indicates that one should be cautious when interpreting complex archaeological materials as evidence for sophisticated cognitive abilities such as reasoning, problem solving or planning, since these abilities are not the sole driver of technological sophistication," said Dr Alex Mesoudi, of the University of Exeter.

The paper is published in Nature Human Behaviour.

Source: University of Exeter [April 01, 2019]

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1 comment :

  1. That depends on the level of understanding in the present day. It can also be seen as the level of social dumbing we have been subjected to. See this for instance of 'advanced brilliance' by our ancestors. Link: https://melitamegalithic.wordpress.com/2017/04/17/melitamegalithic/ The accuracy of solstice prediction is comparable to the best of today. That's 'humble pie' for us.

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