Hominin cognitive evolution: identifying patterns and processes in the fossil and archaeological record

@article{Shultz2012HomininCE,
  title={Hominin cognitive evolution: identifying patterns and processes in the fossil and archaeological record},
  author={Susanne Shultz and Emma Nelson and Robin I. M. Dunbar},
  journal={Philosophical Transactions of the Royal Society B: Biological Sciences},
  year={2012},
  volume={367},
  pages={2130 - 2140}
}
As only limited insight into behaviour is available from the archaeological record, much of our understanding of historical changes in human cognition is restricted to identifying changes in brain size and architecture. Using both absolute and residual brain size estimates, we show that hominin brain evolution was likely to be the result of a mix of processes; punctuated changes at approximately 100 kya, 1 Mya and 1.8 Mya are supplemented by gradual within-lineage changes in Homo erectus and… 

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References

SHOWING 1-10 OF 116 REFERENCES
Environmental hypotheses of hominin evolution.
  • R. Potts
  • Environmental Science
    American journal of physical anthropology
  • 1998
TLDR
Several environmental hypotheses of human evolution are presented and it is shown that the variability selection hypothesis is strongly supported by the persistence of hominins through long sequences of environmental remodeling and the origin of important adaptations in periods of wide habitat diversity.
Hominid Brain Evolution
TLDR
Although the effects of paleoclimatic variability and temperature variation provide support for climatic hypotheses, the proxy for population density predicted more unique variance in CC than all other variables and suggests multiple pressures drove hominid brain evolution and that the core selective force was social competition.
Variability selection in hominid evolution
TLDR
If some complex traits indeed require disparities in adaptive setting (and relative fitness) in order to evolve, the VS idea counters the prevailing view that adaptive change necessitates long‐term, directional consistency in selection.
Encephalization is not a universal macroevolutionary phenomenon in mammals but is associated with sociality
TLDR
It is shown that there is wide variation across groups in encephalization slopes across groups and that encephalizations is not universal in mammals, and it is found that temporal changes in brain size are not associated with allometric relationships between brain and body size.
Hominid Brain Evolution Testing Climatic , Ecological , and Social Competition Models
Hypotheses regarding the selective pressures driving the threefold increase in the size of the hominid brain since Homo habilis include climatic conditions, ecological demands, and social
Brain size and encephalization in early to Mid-Pleistocene Homo.
  • G. P. Rightmire
  • Environmental Science, Geography
    American journal of physical anthropology
  • 2004
TLDR
It is apparent that the (significant) increase in volume documented for the Middle Pleistocene individuals is not simply a consequence of larger body mass, and Encephalization quotient values confirm this finding.
Anatomy, behavior, and modern human origins
The fossil record suggests that modern human morphology evolved in Africa between 150,000 and 50,000 years ago, when the sole inhabitants of Eurasia were the Neanderthals and other equally nonmodern
Paleoclimatic Variation and Brain Expansion during Human Evolution
TLDR
Based on a sample of 109 fossilized hominid skulls, it is found that cranial capacities were highly correlated with paleoclimatic changes in temperature, as indexed by oxygen isotope data and sea-surface temperature.
The pattern of evolution in Pleistocene human brain size
TLDR
The analyses do not reject the hypothesis of a single process of brain size change, but they are incompatible with an interpretation of punctuated equilibrium during this period and the results are difficult to reconcile with the case for cladogenesis in the Homo lineage during the Pleistocene.
The ecology of social transitions in human evolution
  • R. Foley, C. Gamble
  • Biology
    Philosophical Transactions of the Royal Society B: Biological Sciences
  • 2009
TLDR
The underlying model that is developed is that the evolution of ‘human society’ is underpinned by ecological factors, but these are influenced as much by technological and behavioural innovations as external environmental change.
...
...