|Appears in Collections:||Psychology Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Pattern and process in hominin brain size evolution are scale-dependent|
Zipkin, Andrew M
Hatala, Kevin G
Baker, Jennifer L
Bernal, Kallista H
Wood, Bernard A
|Citation:||Du A, Zipkin AM, Hatala KG, Renner E, Baker JL, Bianchi S, Bernal KH & Wood B (2018) Pattern and process in hominin brain size evolution are scale-dependent, Proceedings of the Royal Society B: Biological Sciences, 285 (1873), Art. No.: 20172738. https://doi.org/10.1098/rspb.2017.2738.|
|Abstract:||A large brain is a defining feature of modern humans, yet there is no consensus regarding the patterns, rates and processes involved in hominin brain size evolution. We use a reliable proxy for brain size in fossils, endocranial volume (ECV), to better understand how brain size evolved at both clade- and lineage-level scales. For the hominin clade overall, the dominant signal is consistent with a gradual increase in brain size. This gradual trend appears to have been generated primarily by processes operating within hypothesized lineages—64% or 88% depending on whether one uses a more or less speciose taxonomy, respectively. These processes were supplemented by the appearance in the fossil record of larger-brained Homo species and the subsequent disappearance of smaller-brained Australopithecus and Paranthropus taxa. When the estimated rate of within-lineage ECV increase is compared to an exponential model that operationalizes generation-scale evolutionary processes, it suggests that the observed data were the result of episodes of directional selection interspersed with periods of stasis and/or drift; all of this occurs on too fine a timescale to be resolved by the current human fossil record, thus producing apparent gradual trends within lineages. Our findings provide a quantitative basis for developing and testing scale-explicit hypotheses about the factors that led brain size to increase during hominin evolution.|
|Rights:||Publisher policy allows this work to be made available in this repository. Published in Proceedings of the Royal Society B: Biological Sciences, 28 February 2018, Volume 285, issue 1873 by The Royal Society. The original publication is available at: https://doi.org/10.1098/rspb.2017.2738|
|Du et al 2018_hominin ECV.pdf||Fulltext - Accepted Version||394.8 kB||Adobe PDF||View/Open|
This item is protected by original copyright
Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
If you believe that any material held in STORRE infringes copyright, please contact firstname.lastname@example.org providing details and we will remove the Work from public display in STORRE and investigate your claim.