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Evidence for Precision Grasping in Neandertal Daily Activities

Penelitian - Homo neanderthalensis did not rely on brute force for their daily manual tasks, daily activities mainly involved fine-tuned hand movements. The researchers show that Neanderthals almost exclusively used precision grips in their daily manual tasks.

A research team led by Senckeberg and University of Tübingen scientist, Katerina Harvati, in close collaboration with the Natural History Museum in Basel, rejects the previous assumption that Neanderthals mainly relied on brute force when using their hands.

Penelitian Evidence for Precision Grasping in Neandertal Daily Activities

H. neanderthalensis, who lived in Western Eurasia between 400,000 and 40,000 years before present, are often portrayed as physically strong but otherwise rather clumsy early humans that primarily relied on their strength for the production and use of stone tools. In contrast, modern humans were assumed to systematically use precision manual grips as part of their modern set of behaviors.

“The robust anatomy of Neanderthal hand bones previously led us to believe that they handled their daily tasks primarily by force, even though archeological discoveries increasingly indicate that they showed sophisticated cultural behavior,” explains Harvati of the Senckenberg Centre for Human Evolution and Palaeoenvironment at the University of Tübingen.

Using an innovative method, Harvati’s team has now been able to show that Neanderthals primarily managed their day-to-day tasks using precision rather than power manual grips, contrary to previous hypotheses.

“In our study, we were able for the first time to successfully link the anatomical evidence preserved in the skeleton of fossil humans with the archaeological evidence they left behind, providing a more complete understanding of the behavior of extinct humans,” explains Alexandros-Fotios Karakostis.

The research reveals that Neanderthals systematically employed “precision grips” in their manual activities. Contrary to the “power grip,” which uses the entire palm, including all fingers and the thumb, for gripping, the holding and guiding of objects with the “precision grip” primarily involves the tips of the thumb and index finger.

“Since muscles and tendons are not preserved in the fossil record, we examined the muscle attachment markings, or ‘entheses’ – the areas where muscles and tendons are attached to the bone. These markings are the only direct evidence of muscle activity on the skeleton, but have been difficult to analyze reliably in the past,” explains Harvati.

The researchers developed an innovative method to analyze muscle markings using 3D scanning of hand bones. The new method also focused on muscle groups – rather than single muscles – that together produce precision vs power grips, and thus was able to uncover whether an individual commonly performed power or precision grasping during his or her lifetime.

“This unique collection from the 19th century comprises fully documented skeletons, including information about the circumstances of their life and their profession,” explains Gerhard Hotz of the Natural History Museum in Basel.

“If, for example, we examine a blacksmith’s hand, we can show by means of the muscle attachment points that he regularly used ‘power grips’ during his day-to-day activities,” Hotz says.

The method was verified using samples from the “Basel Spital Cemetery” collection of the Natural History Museum in Basel. None of the examined Neanderthal hand skeletons showed evidence of a sustained use of power grips.

“We therefore refute the commonly held view of the clumsy, forceful Neanderthal. Like modern humans, Neanderthals were competent tool makers and tool users, who were using delicate and precise hand and finger movements in their daily activities,” adds Harvati.

In contrast, the hand bones of early Homo sapiens show traces of the systematic use of both precision as well as power grips, supporting the hypothesis that division of labor intensified for the first time during the Upper Paleolithic.

Journal : Fotios Alexandros Karakostis et al. Evidence for precision grasping in Neandertal daily activities, Science Advances, 26 Sep 2018, DOI:10.1126/sciadv.aat2369



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