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X Demographics
Mendeley readers
Attention Score in Context
| Title |
An early modern human presence in Sumatra 73,000–63,000 years ago
|
|---|---|
| Published in |
Nature, August 2017
|
| DOI | 10.1038/nature23452 |
| Pubmed ID | |
| Authors |
K. E. Westaway, J. Louys, R. Due Awe, M. J. Morwood, G. J. Price, J.-x. Zhao, M. Aubert, R. Joannes-Boyau, T. M. Smith, M. M. Skinner, T. Compton, R. M. Bailey, G. D. van den Bergh, J. de Vos, A. W. G. Pike, C. Stringer, E. W. Saptomo, Y. Rizal, J. Zaim, W. D. Santoso, A. Trihascaryo, L. Kinsley, B. Sulistyanto |
| Abstract |
Genetic evidence for anatomically modern humans (AMH) out of Africa before 75 thousand years ago (ka) and in island southeast Asia (ISEA) before 60 ka (93-61 ka) predates accepted archaeological records of occupation in the region. Claims that AMH arrived in ISEA before 60 ka (ref. 4) have been supported only by equivocal or non-skeletal evidence. AMH evidence from this period is rare and lacks robust chronologies owing to a lack of direct dating applications, poor preservation and/or excavation strategies and questionable taxonomic identifications. Lida Ajer is a Sumatran Pleistocene cave with a rich rainforest fauna associated with fossil human teeth. The importance of the site is unclear owing to unsupported taxonomic identification of these fossils and uncertainties regarding the age of the deposit, therefore it is rarely considered in models of human dispersal. Here we reinvestigate Lida Ajer to identify the teeth confidently and establish a robust chronology using an integrated dating approach. Using enamel-dentine junction morphology, enamel thickness and comparative morphology, we show that the teeth are unequivocally AMH. Luminescence and uranium-series techniques applied to bone-bearing sediments and speleothems, and coupled uranium-series and electron spin resonance dating of mammalian teeth, place modern humans in Sumatra between 73 and 63 ka. This age is consistent with biostratigraphic estimations, palaeoclimate and sea-level reconstructions, and genetic evidence for a pre-60 ka arrival of AMH into ISEA. Lida Ajer represents, to our knowledge, the earliest evidence of rainforest occupation by AMH, and underscores the importance of reassessing the timing and environmental context of the dispersal of modern humans out of Africa. |
X Demographics
The data shown below were collected from the profiles of 484 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 60 | 12% |
| United Kingdom | 39 | 8% |
| Spain | 25 | 5% |
| Australia | 18 | 4% |
| Indonesia | 13 | 3% |
| Japan | 12 | 2% |
| Netherlands | 10 | 2% |
| Mexico | 8 | 2% |
| France | 8 | 2% |
| Other | 63 | 13% |
| Unknown | 228 | 47% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 360 | 74% |
| Scientists | 99 | 20% |
| Science communicators (journalists, bloggers, editors) | 15 | 3% |
| Practitioners (doctors, other healthcare professionals) | 10 | 2% |
Mendeley readers
The data shown below were compiled from readership statistics for 290 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 290 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 66 | 23% |
| Student > Ph. D. Student | 41 | 14% |
| Student > Master | 31 | 11% |
| Student > Bachelor | 26 | 9% |
| Student > Doctoral Student | 14 | 5% |
| Other | 61 | 21% |
| Unknown | 51 | 18% |
| Readers by discipline | Count | As % |
|---|---|---|
| Arts and Humanities | 52 | 18% |
| Agricultural and Biological Sciences | 48 | 17% |
| Social Sciences | 33 | 11% |
| Biochemistry, Genetics and Molecular Biology | 19 | 7% |
| Earth and Planetary Sciences | 17 | 6% |
| Other | 52 | 18% |
| Unknown | 69 | 24% |
Attention Score in Context
This research output has an Altmetric Attention Score of 793. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 29 October 2023.
All research outputs
#24,353
of 25,718,113 outputs
Outputs from Nature
#2,329
of 98,574 outputs
Outputs of similar age
#435
of 328,652 outputs
Outputs of similar age from Nature
#42
of 772 outputs
Altmetric has tracked 25,718,113 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 98,574 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 102.7. This one has done particularly well, scoring higher than 97% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 328,652 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 772 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 94% of its contemporaries.