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6 results for “brain allometry”
Data from: Predation drives the evolution of brain cell proliferation and brain allometry in male Trinidadian killifish, Rivulus hartii
<p>The external environment influences brain cell proliferation, and this might contribute to brain plasticity underlying adaptive behavioural changes. Additionally, internal genetic factors influence brain cell proliferation rate. However, to date, researchers have not examined the importance of environmental vs. genetic factors in causing natural variation in brain cell proliferation. Here, we examine brain cell proliferation and brain growth trajectories in free-living populations of Trinidadian killifish, Rivulus hartii, exposed to contrasting predation environments. Compared to populations without predators, populations in high predation environments exhibited higher rates of brain cell proliferation and a steeper brain growth trajectory (relative to body size). To test whether these differences in the wild persist in a common garden environment, we reared first generation fish originating from both predation environments in uniform laboratory conditions. Just as in the wild, brain cell proliferation and brain growth in the common garden were greater in high predation populations than in no predation populations. The similar results in field and common garden studies indicate that population differences in these brain features are intrinsic, probably genetic, differences arising from natural selection acting on overall brain growth and life history rather than differences arising through phenotypic plasticity.</p>
Data from: Predation drives the evolution of brain cell proliferation and brain allometry in male Trinidadian killifish, Rivulus hartii
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Variation in the strength of allometry drives rates of evolution in primate brain shape - Supplementary Material
<p>Large brains are a defining feature of primates, as is a clear allometric trend</p> <p>between body mass and brain size. However, important questions on the</p> <p>macroevolution of brain shape in primates remain unanswered. Here we</p> <p>address two: (i), does the relationship between the brain size and its shape</p> <p>follow allometric trends and (ii), is this relationship consistent over evolutionary</p> <p>time? We employ three-dimensional geometric morphometrics and</p> <p>phylogenetic comparative methods to answer these questions, based on a</p> <p>large sample representing 151 species and most primate families. We found</p> <p>two distinct trends regarding the relationship between brain shape and</p> <p>brain size. Hominoidea and Cercopithecinae showed significant evolutionary</p> <p>allometry, whereas no allometric trends were discernible for Strepsirrhini,</p> <p>Colobinae or Platyrrhini. Furthermore,we found that in the taxa characterized</p> <p>by significant allometry, brain shape evolution accelerated, whereas for taxa in</p> <p>which such allometrywas absent, the evolution of brain shape decelerated.We</p> <p>conclude that although primates in general are typically described as largebrained,</p> <p>strong allometric effects on brain shape are largely confined to the</p> <p>order's representatives that display more complex behavioural repertoires.</p>
Data from: The allometry of brain size in mammals
Why some animals have big brains and others do not has intrigued scholars for millennia. Yet, the taxonomic scope of brain size research is limited to a few mammal lineages. Here, we present a brain size dataset compiled from the literature for 1,552 species with representation from 28 extant taxonomic orders. The brain–body size allometry across all mammals is (Brain) = −1.26 (Body)^0.75. This relationship shows strong phylogenetic signal. Thus, we conducted additional allometries using median species values for each order, family, and genus to ensure evolutionary independence. Slopes from these analyses at different taxonomic levels all approximate ~0.75 scaling. Why brain size scales to the 3/4 power to body size across mammals is to our knowledge unknown. Slopes within taxonomic orders, exhibiting smaller size ranges, are generally shallower than 0.75 and range from 0.24 to 0.81 with a median slope of 0.64. Published data on brain size are lacking for the majority of extant mammals (> 70% of species) with strong bias in representation from Primates, Carnivora, Perissodactyla, and Australidelphian marsupials (orders Dasyuromorphia, Diprotodontia, Peramelemorphia). Several orders are particularly underrepresented. For example, data on brain size are available for less than 20% of species in each of the following speciose lineages: Soricomorpha, Rodentia, Lagomorpha, Didelphimorphia, and Scandentia. Use of museum collections can decrease the current taxonomic bias in mammal brain size data and tests of hypothesis.
Data from: The allometry of brain size in mammals
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Variation in the strength of allometry drives rates of evolution in primate brain shape - Supplementary Material
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.