A study led by the Max Planck Institute for Evolutionary Anthropology reveals that Lucy’s species, Australopithecus afarensis, had an ape-like brain.
However, the protracted brain growth suggests that infants may have had a long dependence on caregivers, as in humans. The study, in collaboration with the ESRF, is published in Science Advances.
The species Australopithecus afarensis, well-known as Lucy’s species, inhabited East Africa more than three million years ago, and occupies a key position in the hominin family tree.. “Lucy and her kind provide important evidence about early hominin behavior. They walked upright, had brains that were around 20 percent larger than those of chimpanzees and may have used sharp stone tools,” explains senior author Zeresenay Alemseged from the University of Chicago, who directs the Dikika field project in Ethiopia, where the skeleton of an Australopithecus afarensis child, known as Dikika child and nicknamed Selam, was found in the year 2000. “Our new results show how their brains developed, and how they were organized,” adds Alemseged.
Image: Brain imprints in fossil skulls of the speciesAustralopithecus afarensis(famous for “Lucy” and the “Dikika child” from Ethiopia pictured here) shed new lighton the evolution of brain growth and organization. The exceptionally preservedendocranial imprint of the Dikika child reveals an ape-likebrain organization, and nofeatures derived towards humans.
Credit: Philipp Gunz, MPI EVA Leipzig.