101
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102
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Buckner RL, Krienen FM. The evolution of distributed association networks in the human brain. Trends Cogn Sci 2013; 17:648-65. [DOI: 10.1016/j.tics.2013.09.017] [Citation(s) in RCA: 475] [Impact Index Per Article: 43.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 09/28/2013] [Accepted: 09/30/2013] [Indexed: 01/25/2023]
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103
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Abstract
Was stone tool making a factor in the evolution of human hand morphology? Is it possible to find evidence in fossil hominin hands for this capability? These questions are being addressed with increasingly sophisticated studies that are testing two hypotheses; (i) that humans have unique patterns of grip and hand movement capabilities compatible with effective stone tool making and use of the tools and, if this is the case, (ii) that there exist unique patterns of morphology in human hands that are consistent with these capabilities. Comparative analyses of human stone tool behaviours and chimpanzee feeding behaviours have revealed a distinctive set of forceful pinch grips by humans that are effective in the control of stones by one hand during manufacture and use of the tools. Comparative dissections, kinematic analyses and biomechanical studies indicate that humans do have a unique pattern of muscle architecture and joint surface form and functions consistent with the derived capabilities. A major remaining challenge is to identify skeletal features that reflect the full morphological pattern, and therefore may serve as clues to fossil hominin manipulative capabilities. Hominin fossils are evaluated for evidence of patterns of derived human grip and stress-accommodation features.
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Affiliation(s)
- Mary W. Marzke
- School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287-2402, USA
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104
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Gill CM, Taneja AK, Bredella MA, Torriani M, DeSilva JM. Osteogenic relationship between the lateral plantar process and the peroneal tubercle in the human calcaneus. J Anat 2013; 224:173-9. [PMID: 24188397 DOI: 10.1111/joa.12135] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/09/2013] [Indexed: 12/17/2022] Open
Abstract
The osteogenic relationship between the lateral plantar process and the peroneal tubercle has been an uncertainty for researchers over several decades. While some argue there to be no developmental relationship between these two calcaneal structures, others have suggested that there is an inverse relationship, the lateral plantar process forming from a part of the peroneal tubercle. However, no previous studies have offered quantitative measurements to test these hypotheses. In this study, we measured the size of the peroneal tubercle, retrotrochlear eminence, and the size and area of the lateral plantar process in 73 subjects using magnetic resonance imaging (MRI). Navicular height was measured using weight-bearing radiographs as a measurement of longitudinal arch in 35 of these subjects. Age, body mass, and body mass index (BMI) were also recorded for all subjects. We determined that there was a significant positive correlation between the lateral plantar process and size of the peroneal tubercle, body mass, and BMI. Thus, assertions that there is an inverse relationship between the size of the lateral plantar process and the peroneal tubercle are here unfounded. We also determined there to be a positive correlation between the peroneal tubercle and both the size of the retrotrochlear eminence and the height of the navicular. In conclusion, we relate these novel findings to hominin fossil calcanei and discuss the evolutionary and biomechanical implications.
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Affiliation(s)
- Corey M Gill
- Department of Musculoskeletal Imaging and Intervention, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Department of Anthropology, Boston University, Boston, MA, USA
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105
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Kivell TL, Barros AP, Smaers JB. Different evolutionary pathways underlie the morphology of wrist bones in hominoids. BMC Evol Biol 2013; 13:229. [PMID: 24148262 PMCID: PMC4015765 DOI: 10.1186/1471-2148-13-229] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 10/11/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The hominoid wrist has been a focus of numerous morphological analyses that aim to better understand long-standing questions about the evolution of human and hominoid hand use. However, these same analyses also suggest various scenarios of complex and mosaic patterns of morphological evolution within the wrist and potentially multiple instances of homoplasy that would benefit from require formal analysis within a phylogenetic context.We identify morphological features that principally characterize primate - and, in particular, hominoid (apes, including humans) - wrist evolution and reveal the rate, process and evolutionary timing of patterns of morphological change on individual branches of the primate tree of life. Linear morphological variables of five wrist bones - the scaphoid, lunate, triquetrum, capitate and hamate - are analyzed in a diverse sample of extant hominoids (12 species, 332 specimens), Old World (8 species, 43 specimens) and New World (4 species, 26 specimens) monkeys, fossil Miocene apes (8 species, 20 specimens) and Plio-Pleistocene hominins (8 species, 18 specimens). RESULT Results reveal a combination of parallel and synapomorphic morphology within haplorrhines, and especially within hominoids, across individual wrist bones. Similar morphology of some wrist bones reflects locomotor behaviour shared between clades (scaphoid, triquetrum and capitate) while others (lunate and hamate) indicate clade-specific synapomorphic morphology. Overall, hominoids show increased variation in wrist bone morphology compared with other primate clades, supporting previous analyses, and demonstrate several occurrences of parallel evolution, particularly between orangutans and hylobatids, and among hominines (extant African apes, humans and fossil hominins). CONCLUSIONS Our analyses indicate that different evolutionary processes can underlie the evolution of a single anatomical unit (the wrist) to produce diversity in functional and morphological adaptations across individual wrist bones. These results exemplify a degree of evolutionary and functional independence across different wrist bones, the potential evolvability of skeletal morphology, and help to contextualize the postcranial mosaicism observed in the hominin fossil record.
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Affiliation(s)
- Tracy L Kivell
- School of Anthropology and Conservation, University of Kent, Canterbury, UK
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Anna P Barros
- Department of Anthropology, University College London, London, UK
| | - Jeroen B Smaers
- Department of Anthropology, University College London, London, UK
- Department of Anthropology, Stony Brook University, Stony Brook, USA
- Department of Genetics, Evolution and Environment, University College London, London, UK
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106
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Hashimoto T, Ueno K, Ogawa A, Asamizuya T, Suzuki C, Cheng K, Tanaka M, Taoka M, Iwamura Y, Suwa G, Iriki A. Hand before foot? Cortical somatotopy suggests manual dexterity is primitive and evolved independently of bipedalism. Philos Trans R Soc Lond B Biol Sci 2013; 368:20120417. [PMID: 24101627 PMCID: PMC4027408 DOI: 10.1098/rstb.2012.0417] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
People have long speculated whether the evolution of bipedalism in early hominins triggered tool use (by freeing their hands) or whether the necessity of making and using tools encouraged the shift to upright gait. Either way, it is commonly thought that one led to the other. In this study, we sought to shed new light on the origins of manual dexterity and bipedalism by mapping the neural representations in the brain of the fingers and toes of living people and monkeys. Contrary to the ‘hand-in-glove’ notion outlined above, our results suggest that adaptations underlying tool use evolved independently of those required for human bipedality. In both humans and monkeys, we found that each finger was represented separately in the primary sensorimotor cortex just as they are physically separated in the hand. This reflects the ability to use each digit independently, as required for the complex manipulation involved in tool use. The neural mapping of the subjects’ toes differed, however. In the monkeys, the somatotopic representation of the toes was fused, showing that the digits function predominantly as a unit in general grasping. Humans, by contrast, had an independent neurological representation of the big toe (hallux), suggesting association with bipedal locomotion. These observations suggest that the brain circuits for the hand had advanced beyond simple grasping, whereas our primate ancestors were still general arboreal quadrupeds. This early adaptation laid the foundation for the evolution of manual dexterity, which was preserved and enhanced in hominins. In hominins, a separate adaptation, involving the neural separation of the big toe, apparently occurred with bipedality. This accords with the known fossil evidence, including the recently reported hominin fossils which have been dated to 4.4 million years ago.
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Affiliation(s)
- Teruo Hashimoto
- Laboratory for Symbolic Cognitive Development, RIKEN Brain Science Institute, , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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107
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Rolian C, Gordon AD. Reassessing manual proportions inAustralopithecus afarensis. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2013; 152:393-406. [DOI: 10.1002/ajpa.22365] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 08/19/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Campbell Rolian
- Department of Comparative Biology and Experimental Medicine; Faculty of Veterinary Medicine; University of Calgary; Calgary; Alberta; Canada; T2N4N1
| | - Adam D. Gordon
- Department of Anthropology; University at Albany-SUNY; Albany; NY; 12222
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108
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Van Arsdale AP. A Shifting Theoretical Framework for Biological Anthropology in 2012. AMERICAN ANTHROPOLOGIST 2013. [DOI: 10.1111/aman.12008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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109
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Venkataraman VV, Rolian C, Gordon AD, Patel BA. A resampling approach and implications for estimating the phalangeal index from unassociated hand bones in fossil primates. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2013; 151:280-9. [DOI: 10.1002/ajpa.22278] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 03/19/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Vivek V. Venkataraman
- Department of Biological Sciences; Class of 1978 Life Sciences Center, Dartmouth College; Hanover; NH; 03755
| | - Campbell Rolian
- Department of Comparative Biology and Experimental Medicine; Faculty of Veterinary Medicine; University of Calgary; Calgary; Alberta; Canada; T2N4N1
| | - Adam D. Gordon
- Department of Anthropology; University at Albany-SUNY; Albany; NY; 12222
| | - Biren A. Patel
- Department of Cell and Neurobiology; Keck School of Medicine; University of Southern California; Los Angeles; CA; 90033
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110
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Affiliation(s)
- Lee R Berger
- Evolutionary Studies Institute, University of the Witwatersrand, Wits 2050, South Africa. profl
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111
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Irish JD, Guatelli-Steinberg D, Legge SS, de Ruiter DJ, Berger LR. Dental Morphology and the Phylogenetic “Place” of
Australopithecus sediba. Science 2013; 340:1233062. [DOI: 10.1126/science.1233062] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Joel D. Irish
- Research Centre in Evolutionary Anthropology and Palaeoecology, School of Natural Sciences and Psychology, Liverpool John Moores University, Liverpool L3 3AF, UK
| | - Debbie Guatelli-Steinberg
- Department of Anthropology, and Department of Evolution, Ecology, and Organismal Biology, Ohio State University, Columbus, OH 43210, USA
| | - Scott S. Legge
- Department of Anthropology, Macalester College, St. Paul, MN 55105, USA
| | - Darryl J. de Ruiter
- Department of Anthropology, Texas A&M University, College Station, TX 77843, USA
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
| | - Lee R. Berger
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
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112
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de Ruiter DJ, DeWitt TJ, Carlson KB, Brophy JK, Schroeder L, Ackermann RR, Churchill SE, Berger LR. Mandibular Remains Support Taxonomic Validity of
Australopithecus sediba. Science 2013; 340:1232997. [DOI: 10.1126/science.1232997] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Darryl J. de Ruiter
- Department of Anthropology, Texas A&M University, College Station, TX 77843, USA
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
| | - Thomas J. DeWitt
- Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Keely B. Carlson
- Department of Anthropology, Texas A&M University, College Station, TX 77843, USA
| | - Juliet K. Brophy
- Department of Anthropology, Texas A&M University, College Station, TX 77843, USA
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
- Department of Anthropology, Loyola University, Chicago, IL 60660, USA
| | - Lauren Schroeder
- Department of Archaeology, University of Cape Town, Rondebosch 7701, South Africa
| | - Rebecca R. Ackermann
- Department of Archaeology, University of Cape Town, Rondebosch 7701, South Africa
| | - Steven E. Churchill
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
- Department of Evolutionary Anthropology, Box 90383, Duke University, Durham, NC 27708, USA
| | - Lee R. Berger
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
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113
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Schmid P, Churchill SE, Nalla S, Weissen E, Carlson KJ, de Ruiter DJ, Berger LR. Mosaic Morphology in the Thorax of
Australopithecus sediba. Science 2013; 340:1234598. [DOI: 10.1126/science.1234598] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Peter Schmid
- Anthropological Institute and Museum, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
| | - Steven E. Churchill
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
- Department of Evolutionary Anthropology, Box 90383, Duke University, Durham, NC 27708, USA
| | - Shahed Nalla
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
- Department of Human Anatomy and Physiology, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa
| | - Eveline Weissen
- Anthropological Institute and Museum, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Kristian J. Carlson
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
- Department of Anthropology, Indiana University, Bloomington, IN 47405, USA
| | - Darryl J. de Ruiter
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
- Department of Anthropology, Texas A&M University, College Station, TX 77843, USA
| | - Lee R. Berger
- Evolutionary Studies Institute, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
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114
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DeSilva JM, Holt KG, Churchill SE, Carlson KJ, Walker CS, Zipfel B, Berger LR. The Lower Limb and Mechanics of Walking in Australopithecus sediba. Science 2013; 340:1232999. [DOI: 10.1126/science.1232999] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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115
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Churchill SE, Holliday TW, Carlson KJ, Jashashvili T, Macias ME, Mathews S, Sparling TL, Schmid P, de Ruiter DJ, Berger LR. The Upper Limb of Australopithecus sediba. Science 2013; 340:1233477. [DOI: 10.1126/science.1233477] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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116
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Abstract
When people learn that I study human evolution and we start talking about it, they sometimes ask me, "How long ago did the first humans live?" My answer is usually another question: "What do you mean by 'humans'?" That response seems as baffling and wrong-headed to them as their question seems to me, and it usually takes us a while to straighten things out. © 2012 Wiley Periodicals, Inc.
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117
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Orr CM, Tocheri MW, Burnett SE, Awe RD, Saptomo EW, Sutikna T, Jatmiko, Wasisto S, Morwood MJ, Jungers WL. New wrist bones of Homo floresiensis from Liang Bua (Flores, Indonesia). J Hum Evol 2013; 64:109-29. [DOI: 10.1016/j.jhevol.2012.10.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 06/13/2012] [Accepted: 10/19/2012] [Indexed: 11/29/2022]
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118
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Morgan MH, Carrier DR. Protective buttressing of the human fist and the evolution of hominin hands. J Exp Biol 2013; 216:236-44. [DOI: 10.1242/jeb.075713] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
SUMMARY
The derived proportions of the human hand may provide supportive buttressing that protects the hand from injury when striking with a fist. Flexion of digits 2–5 results in buttressing of the pads of the distal phalanges against the central palm and the palmar pads of the proximal phalanges. Additionally, adduction of the thenar eminence to abut the dorsal surface of the distal phalanges of digits 2 and 3 locks these digits into a solid configuration that may allow a transfer of energy through the thenar eminence to the wrist. To test the hypothesis of a performance advantage, we measured: (1) the forces and rate of change of acceleration (jerk) from maximum effort strikes of subjects striking with a fist and an open hand; (2) the static stiffness of the second metacarpo-phalangeal (MCP) joint in buttressed and unbuttressed fist postures; and (3) static force transfer from digits 2 and 3 to digit 1 also in buttressed and unbuttressed fist postures. We found that peak forces, force impulses and peak jerk did not differ between the closed fist and open palm strikes. However, the structure of the human fist provides buttressing that increases the stiffness of the second MCP joint by fourfold and, as a result of force transfer through the thenar eminence, more than doubles the ability of the proximal phalanges to transmit ‘punching’ force. Thus, the proportions of the human hand provide a performance advantage when striking with a fist. We propose that the derived proportions of hominin hands reflect, in part, sexual selection to improve fighting performance.
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Affiliation(s)
- Michael H. Morgan
- The University of Utah School of Medicine, 30 N. 1900 E., Salt Lake City, UT 84132, USA
| | - David R. Carrier
- Department of Biology, University of Utah, 257 S. 1400 E., Salt Lake City, UT 84112, USA
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119
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Sustaita D, Pouydebat E, Manzano A, Abdala V, Hertel F, Herrel A. Getting a grip on tetrapod grasping: form, function, and evolution. Biol Rev Camb Philos Soc 2013; 88:380-405. [DOI: 10.1111/brv.12010] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 11/13/2012] [Accepted: 11/20/2012] [Indexed: 11/28/2022]
Affiliation(s)
- Diego Sustaita
- Ecology and Evolutionary Biology; University of Connecticut; 75 N. Eagleville Road; Storrs; CT; 06269-3043; USA
| | - Emmanuelle Pouydebat
- Département d'Ecologie et de Gestion de la Biodiversité; UMR 7179 C.N.R.S/M.N.H.N; 57 rue Cuvier; 75231; Paris; France
| | - Adriana Manzano
- CONICET-UADER; Matteri y España, (3105); Entre Ríos; Argentina
| | - Virginia Abdala
- Instituto de Herpetología; Fundación Miguel Lillo-CONICET; Miguel Lillo 251; Tucumán; Argentina
| | - Fritz Hertel
- Department of Biology; California State University; 18111 Nordhoff Street; Northbridge; CA; 91330-8303; USA
| | - Anthony Herrel
- Département d'Ecologie et de Gestion de la Biodiversité; UMR 7179 C.N.R.S/M.N.H.N; 57 rue Cuvier; 75231; Paris; France
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120
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Ward CV. Postural and Locomotor Adaptations of Australopithecus Species. THE PALEOBIOLOGY OF AUSTRALOPITHECUS 2013. [DOI: 10.1007/978-94-007-5919-0_16] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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121
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Rein TR, Harvati K. Exploring third metacarpal capitate facet shape in early hominins. Anat Rec (Hoboken) 2012; 296:240-9. [PMID: 23233292 DOI: 10.1002/ar.22635] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 09/17/2012] [Accepted: 10/22/2012] [Indexed: 11/06/2022]
Abstract
The joint between the capitate and third metacarpal plays an important role in stabilizing the manus during hand use in great apes and humans. Researchers have examined the morphology of this region in humans, our fossil relatives, and other extant primates to try to understand the importance of this joint in human evolution. The first goal of our research was to explore shape variation of the third metacarpal capitate facet across extant anthropoids, including hominoids, cercopithecoids, and platyrrhines. This analysis allowed us to examine the range of variation in the capitate facet and the degree to which locomotor behavior, phylogeny, and size explained shape variation. We also examined capitate facet shape in the early hominin fossil record in order to explore how the shape of this articular surface has changed during early hominin evolution. We captured six landmark coordinates on the edge of the capitate facet in extant anthropoids and fossil specimens to quantify and visualize shape variation in this region. We used principal components analysis, Procrustes distances, and multivariate regression analysis to investigate different possible influences on shape variation. We found that shape variation corresponded to function, phylogeny, and size. With the exception of brachiation, shape variation did not clearly correspond with any specific locomotor behavior. However, we identified a shift in the relative mediolateral breadth of the capitate facet during early hominin evolution, which is most likely one of several adaptations for a more stable joint surface.
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Affiliation(s)
- Thomas R Rein
- Department of Early Prehistory and Quaternary Ecology, Paleoanthropology Section, Senckenberg Center for Human Evolution and Paleoecology, Eberhard Karls Universität Tübingen, Rümelinstr. 23, 72070 Tübingen, Germany.
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122
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Holliday TW. Body Size, Body Shape, and the Circumscription of the Genus Homo. CURRENT ANTHROPOLOGY 2012. [DOI: 10.1086/667360] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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123
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Weiss KM. Agnotology: how can we handle what we don't know in a knowing way? Evol Anthropol 2012; 21:96-100. [PMID: 22718476 DOI: 10.1002/evan.21303] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kenneth M Weiss
- Evan Pugh Professor of Anthropology and Genetics, Pennsylvania State University, USA.
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124
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Abstract
Specimens of Australopithecus sediba from the site of Malapa, South Africa (dating from approximately 2 million years (Myr) ago) present a mix of primitive and derived traits that align the taxon with other Australopithecus species and with early Homo. Although much of the available cranial and postcranial material of Au. sediba has been described, its feeding ecology has not been investigated. Here we present results from the first extraction of plant phytoliths from dental calculus of an early hominin. We also consider stable carbon isotope and dental microwear texture data for Au. sediba in light of new palaeoenvironmental evidence. The two individuals examined consumed an almost exclusive C(3) diet that probably included harder foods, and both dicotyledons (for example, tree leaves, fruits, wood and bark) and monocotyledons (for example, grasses and sedges). Like Ardipithecus ramidus (approximately 4.4 Myr ago) and modern savanna chimpanzees, Au. sediba consumed C(3) foods in preference to widely available C(4) resources. The inferred consumption of C(3) monocotyledons, and wood or bark, increases the known variety of early hominin foods. The overall dietary pattern of these two individuals contrasts with available data for other hominins in the region and elsewhere.
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125
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Louys J, Montanari S, Plummer T, Hertel F, Bishop LC. Evolutionary Divergence and Convergence in Shape and Size Within African Antelope Proximal Phalanges. J MAMM EVOL 2012. [DOI: 10.1007/s10914-012-9211-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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126
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Lewton KL. Complexity in Biological Anthropology in 2011: Species, Reproduction, and Sociality. AMERICAN ANTHROPOLOGIST 2012. [DOI: 10.1111/j.1548-1433.2012.01418.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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127
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Congdon KA. Interspecific and Ontogenetic Variation in Proximal Pedal Phalangeal Curvature of Great Apes (Gorilla gorilla, Pan troglodytes, and Pongo pygmaeus). INT J PRIMATOL 2012. [DOI: 10.1007/s10764-012-9590-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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128
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Berger LR. Building a nation one project at a time: Reply to ‘On human evolution, <i>Australopithecus sediba</i> and nation building’. S AFR J SCI 2012. [DOI: 10.4102/sajs.v108i1/2.1031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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129
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130
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Carnivoran remains from the Malapa hominin site, South Africa. PLoS One 2011; 6:e26940. [PMID: 22073222 PMCID: PMC3207828 DOI: 10.1371/journal.pone.0026940] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Accepted: 10/06/2011] [Indexed: 11/19/2022] Open
Abstract
Recent discoveries at the new hominin-bearing deposits of Malapa, South Africa, have yielded a rich faunal assemblage associated with the newly described hominin taxon Australopithecus sediba. Dating of this deposit using U-Pb and palaeomagnetic methods has provided an age of 1.977 Ma, being one of the most accurately dated, time constrained deposits in the Plio-Pleistocene of southern Africa. To date, 81 carnivoran specimens have been identified at this site including members of the families Canidae, Viverridae, Herpestidae, Hyaenidae and Felidae. Of note is the presence of the extinct taxon Dinofelis cf. D. barlowi that may represent the last appearance date for this species. Extant large carnivores are represented by specimens of leopard (Panthera pardus) and brown hyaena (Parahyaena brunnea). Smaller carnivores are also represented, and include the genera Atilax and Genetta, as well as Vulpes cf. V. chama. Malapa may also represent the first appearance date for Felis nigripes (Black-footed cat). The geochronological age of Malapa and the associated hominin taxa and carnivoran remains provide a window of research into mammalian evolution during a relatively unknown period in South Africa and elsewhere. In particular, the fauna represented at Malapa has the potential to elucidate aspects of the evolution of Dinofelis and may help resolve competing hypotheses about faunal exchange between East and Southern Africa during the late Pliocene or early Pleistocene.
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Abstract
More than 30 muscles drive the hand to perform a multitude of essential dextrous tasks. Here we consider new views on the evolution of hand structure and on peripheral and central constraints for independent control of the digits of the hand. The human hand is widely assumed to have evolved from hands like those of African apes, yet recent studies have shown that our hands and those of the earliest hominids are very similar and unlike those of living apes. Understanding the limits of hand function may come from investigation of our last common ancestor with the great apes, rather than the great apes themselves. In the periphery, movement across the full range of joint space can be limited by mechanical linkages among the extrinsic muscles. Further, peripheral limits occur when the hand adopts some positions in which the contraction of muscles fails to move the joints on which they usually act; there is muscle 'disengagement' and functional paralysis for some actions. Surprisingly, the central nervous system drives the hand seamlessly through this landscape of mechanical limits. Central constraints on control of the individual digits include the spillover of neural drive to neighbouring muscles and their 'compartments', and the inability to make maximal muscle forces when multiple digits contract strongly which produces a force deficit. The pattern of these latter constraints correlates with amounts of daily use of each digit and favours enslaved extension to lift fingers from an object but selective flexion of fingers to contact it.
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Affiliation(s)
- Hiske van Duinen
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
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Fossils raise questions about human ancestry. Nature 2011. [DOI: 10.1038/news.2011.527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Zipfel B, DeSilva JM, Kidd RS, Carlson KJ, Churchill SE, Berger LR. The foot and ankle of Australopithecus sediba. Science 2011; 333:1417-20. [PMID: 21903807 DOI: 10.1126/science.1202703] [Citation(s) in RCA: 110] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
A well-preserved and articulated partial foot and ankle of Australopithecus sediba, including an associated complete adult distal tibia, talus, and calcaneus, have been discovered at the Malapa site, South Africa, and reported in direct association with the female paratype Malapa Hominin 2. These fossils reveal a mosaic of primitive and derived features that are distinct from those seen in other hominins. The ankle (talocrural) joint is mostly humanlike in form and inferred function, and there is some evidence for a humanlike arch and Achilles tendon. However, Au. sediba is apelike in possessing a more gracile calcaneal body and a more robust medial malleolus than expected. These observations suggest, if present models of foot function are correct, that Au. sediba may have practiced a unique form of bipedalism and some degree of arboreality. Given the combination of features in the Au. sediba foot, as well as comparisons between Au. sediba and older hominins, homoplasy is implied in the acquisition of bipedal adaptations in the hominin foot.
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Affiliation(s)
- Bernhard Zipfel
- Institute for Human Evolution, University of the Witwatersrand, Post Office Wits, 2050 Wits, South Africa.
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Carlson KJ, Stout D, Jashashvili T, de Ruiter DJ, Tafforeau P, Carlson K, Berger LR. The endocast of MH1, Australopithecus sediba. Science 2011; 333:1402-7. [PMID: 21903804 DOI: 10.1126/science.1203922] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The virtual endocast of MH1 (Australopithecus sediba), obtained from high-quality synchrotron scanning, reveals generally australopith-like convolutional patterns on the frontal lobes but also some foreshadowing of features of the human frontal lobes, such as posterior repositioning of the olfactory bulbs. Principal component analysis of orbitofrontal dimensions on australopith endocasts (MH1, Sts 5, and Sts 60) indicates that among these, MH1 orbitofrontal shape and organization align most closely with human endocasts. These results are consistent with gradual neural reorganization of the orbitofrontal region in the transition from Australopithecus to Homo, but given the small volume of the MH1 endocast, they are not consistent with gradual brain enlargement before the transition.
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Affiliation(s)
- Kristian J Carlson
- Institute for Human Evolution, University of the Witwatersrand, Palaeosciences Centre, Private Bag 3, Wits 2050, South Africa.
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Pickering R, Dirks PHGM, Jinnah Z, de Ruiter DJ, Churchil SE, Herries AIR, Woodhead JD, Hellstrom JC, Berger LR. Australopithecus sediba at 1.977 Ma and Implications for the Origins of the Genus Homo. Science 2011; 333:1421-3. [PMID: 21903808 DOI: 10.1126/science.1203697] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Robyn Pickering
- School of Earth Sciences, University of Melbourne, Victoria, 3010, Australia.
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Kibii JM, Churchill SE, Schmid P, Carlson KJ, Reed ND, de Ruiter DJ, Berger LR. A Partial Pelvis of Australopithecus sediba. Science 2011; 333:1407-11. [PMID: 21903805 DOI: 10.1126/science.1202521] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Job M Kibii
- Institute for Human Evolution, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
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