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Brain, Behavior and Evolution

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https://www.readbyqxmd.com/read/28125804/cellular-scaling-rules-for-the-brains-of-marsupials-not-as-primitive-as-expected
#1
Sandra E Dos Santos, Jairo Porfirio, Felipe B da Cunha, Paul R Manger, William Tavares, Leila Pessoa, Mary Ann Raghanti, Chet C Sherwood, Suzana Herculano-Houzel
In the effort to understand the evolution of mammalian brains, we have found that common relationships between brain structure mass and numbers of nonneuronal (glial and vascular) cells apply across eutherian mammals, but brain structure mass scales differently with numbers of neurons across structures and across primate and nonprimate clades. This suggests that the ancestral scaling rules for mammalian brains are those shared by extant nonprimate eutherians - but do these scaling relationships apply to marsupials, a sister group to eutherians that diverged early in mammalian evolution? Here we examine the cellular composition of the brains of 10 species of marsupials...
January 27, 2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560929/preface
#2
Alice Schade Powers
No abstract text is available yet for this article.
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560629/fish-neurogenesis-in-context-assessing-environmental-influences-on-brain-plasticity-within-a-highly-labile-physiology-and-morphology
#3
Kent D Dunlap
Fish have unusually high rates of brain cell proliferation and neurogenesis during adulthood, and the rates of these processes are greatly influenced by the environment. This high level of cell proliferation and its responsiveness to environmental change indicate that such plasticity might be a particularly important mechanism underlying behavioral plasticity in fish. However, as part of their highly labile physiology and morphology, fish also respond to the environment through processes that affect cell proliferation but that are not specific to behavioral change...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560485/factors-that-modulate-neurogenesis-a-top-down-approach
#4
Lara D LaDage
Although hippocampal neurogenesis in the adult brain has been conserved across the vertebrate lineage, laboratory studies have primarily examined this phenomenon in rodent models. This approach has been successful in elucidating important factors and mechanisms that can modulate rates of hippocampal neurogenesis, including hormones, environmental complexity, learning and memory, motor stimulation, and stress. However, recent studies have found that neurobiological research on neurogenesis in rodents may not easily translate to, or explain, neurogenesis patterns in nonrodent systems, particularly in species examined in the field...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560384/on-the-role-of-neurogenesis-and-neural-plasticity-in-the-evolution-of-animal-personalities-and-stress-coping-styles
#5
Øyvind Øverli, Christina Sørensen
Individual variation in how animals react to stress and environmental change has become a central topic in a wide range of biological disciplines, from evolutionary ecology to biomedicine. Such variation manifests phenotypically as correlated trait-clusters (referred to as coping styles, behavioral syndromes, shyness-boldness, or personality traits). Thresholds for switching from active coping (fight-flight) to inhibition and passive behavior when exposed to stress depend on experience and genetic factors. Comparative research has revealed a range of neuroendocrine-behavioral associations which are conserved throughout the vertebrate subphylum, including factors affecting perception, learning, and memory of stimuli and events...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560356/adult-neurogenesis-in-mammals-variations-and-confusions
#6
Hans-Peter Lipp, Luca Bonfanti
Mammalian adult neurogenesis has remained enigmatic. Two lines of research have emerged. One focuses on a potential repair mechanism in the human brain. The other aims at elucidating its functional role in the hippocampal formation, chiefly in cognitive processes; however, thus far it has been unsuccessful. Here, we try to recognize the sources of errors and conceptual confusion in comparative studies and neurobehavioral approaches with a focus on mice. Evolutionarily, mammalian adult neurogenesis appears as protracted juvenile neurogenesis originating from precursor cells in the secondary proliferation zones, from where newly formed cells migrate to target regions in the forebrain...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560194/adult-neurogenesis-lessons-from-crayfish-and-the-elephant-in-the-room
#7
Barbara S Beltz, Georg Brenneis, Jeanne L Benton
The 1st-generation neural precursors in the crustacean brain are functionally analogous to neural stem cells in mammals. Their slow cycling, migration of their progeny, and differentiation of their descendants into neurons over several weeks are features of the neural precursor lineage in crayfish that also characterize adult neurogenesis in mammals. However, the 1st-generation precursors in crayfish do not self-renew, contrasting with conventional wisdom that proposes the long-term self-renewal of adult neural stem cells...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27560148/adult-neurogenesis-in-the-songbird-region-specific-contributions-of-new-neurons-to-behavioral-plasticity-and-stability
#8
Carolyn L Pytte
Our understanding of the role of new neurons in learning and encoding new information has been largely based on studies of new neurons in the mammalian dentate gyrus and olfactory bulb - brain regions that may be specialized for learning. Thus the role of new neurons in regions that serve other functions has yet to be fully explored. The song system provides a model for studying new neuron function in brain regions that contribute differently to song learning, song auditory discrimination, and song motor production...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27559734/plasticity-and-adult-neurogenesis-in-amphibians-and-reptiles-more-questions-than-answers
#9
Alice Schade Powers
Studies of the relationship between behavioral plasticity and new cells in the adult brain in amphibians and reptiles are sparse but demonstrate that environmental and hormonal variables do have an effect on the amount of cell proliferation and/or migration. The variables that are reviewed here are: enriched environment, social stimulation, spatial area use, season, photoperiod and temperature, and testosterone. Fewer data are available for amphibians than for reptiles, but for both groups many issues are still to be resolved...
August 24, 2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28122370/comparison-of-dolphins-body-and-brain-measurements-with-four-other-groups-of-cetaceans-reveals-great-diversity
#10
Sam H Ridgway, Kevin P Carlin, Kaitlin R Van Alstyne, Alicia C Hanson, Raymond J Tarpley
We compared mature dolphins with 4 other groupings of mature cetaceans. With a large data set, we found great brain diversity among 5 different taxonomic groupings. The dolphins in our data set ranged in body mass from about 40 to 6,750 kg and in brain mass from 0.4 to 9.3 kg. Dolphin body length ranged from 1.3 to 7.6 m. In our combined data set from the 4 other groups of cetaceans, body mass ranged from about 20 to 120,000 kg and brain mass from about 0.2 to 9.2 kg, while body length varied from 1.21 to 26...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28118619/characterization-of-nadph-diaphorase-and-doublecortin-positive-neurons-in-the-lizard-hippocampal-formation
#11
Matheus Macedo-Lima, Marco Aurélio M Freire, Hugo de Carvalho Pimentel, Lívia Cristina Rodrigues Ferreira Lins, Katty Anne Amador de Lucena Medeiros, Giordano Gubert Viola, José Ronaldo Dos Santos, Murilo Marchioro
The lizard cortex has remarkable similarities with the mammalian hippocampus. Both regions process memories, have similar cytoarchitectural properties, and are important neurogenic foci in adults. Lizards show striking levels of widespread neurogenesis in adulthood and can regenerate entire cortical areas after injury. Nitric oxide (NO) is an important regulatory factor of mammalian neurogenesis and hippocampal function. However, little is known about its role in nonmammalian neurogenesis. Here, we analyzed the distribution, morphology, and dendritic complexity (Neurolucida reconstructions) of NO-producing neurons through NADPH diaphorase (NADPHd) activity, and how they compare with the distribution of doublecortin-positive (DCX+) neurons in the hippocampal formation of the neotropical lizard Tropidurus hispidus...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28099952/zebrin-ii-is-expressed-in-sagittal-stripes-in-the-cerebellum-of-dragon-lizards-ctenophorus-sp
#12
Douglas R Wylie, Daniel Hoops, Joel W Aspden, Andrew N Iwaniuk
Aldolase C, also known as zebrin II (ZII), is a glycolytic enzyme that is expressed in cerebellar Purkinje cells of the vertebrate cerebellum. In both mammals and birds, ZII is expressed heterogeneously, such that there are sagittal stripes of Purkinje cells with high ZII expression (ZII+) alternating with stripes of Purkinje cells with little or no expression (ZII-). In contrast, in snakes and turtles, ZII is not expressed heterogeneously; rather all Purkinje cells are ZII+. Here, we examined the expression of ZII in the cerebellum of lizards to elucidate the evolutionary origins of ZII stripes in Sauropsida...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28092905/endocranial-morphology-of-the-extinct-north-american-lion-panthera-atrox
#13
Andrew R Cuff, Christopher Stockey, Anjali Goswami
The extinct North American lion (Panthera atrox) is one of the largest felids (Mammalia, Carnivora) to have ever lived, and it is known from a plethora of incredibly well-preserved remains. Despite this abundance of material, there has been little research into its endocranial anatomy. CT scans of a skull of P. atrox from the Pleistocene La Brea Tar pits were used to generate the first virtual endocranium for this species and to elucidate previously unknown details of its brain size and gross structure, cranial nerves, and inner-ear morphology...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28068650/evolution-of-gyrification-in-carnivores
#14
George A Lyras, Aggeliki Giannakopoulou, Miranda Kouvari, Georgios C Papadopoulos
The order Carnivora is a large and highly diverse mammalian group with a long and well-documented evolutionary history. Nevertheless, our knowledge on the degree of cortical folding (or degree of gyrification) is limited to just a few species. Here we investigate the degree of cortical folding in 64 contemporary and 37 fossil carnivore species. We do so by measuring the length of gyri impressions on endocranial casts. We use this approach because we have found that there is a very good correlation between the degree of cortical folding and the relative length of the gyri that are exposed on the outer surface of the hemispheres...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27889766/telencephalic-neuronal-activation-associated-with-spatial-memory-in-the-terrestrial-toad-rhinella-arenarum-participation-of-the-medial-pallium-during-navigation-by-geometry
#15
María Inés Sotelo, M Florencia Daneri, Verner Peter Bingman, Rubén N Muzio
Amphibians are central to discussions of vertebrate evolution because they represent the transition from aquatic to terrestrial life, a transition with profound consequences for the selective pressures shaping brain evolution. Spatial navigation is one class of behavior that has attracted the interest of comparative neurobiologists because of the relevance of the medial pallium/hippocampus, yet, surprisingly, in this regard amphibians have been sparsely investigated. In the current study, we trained toads to locate a water goal relying on the boundary geometry of a test environment (Geometry-Only) or boundary geometry coupled with a prominent, visual feature cue (Geometry-Feature)...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27866201/comparative-analysis-of-gene-regulatory-network-components-in-the-auditory-hindbrain-of-mice-and-chicken
#16
Benjamin Pawlik, Tina Schlüter, Heiner Hartwich, Saskia Breuel, Lennart Heepmann, Hans Gerd Nothwang
The neurons in the mammalian and avian auditory hindbrain nuclei share a number of significant morphological and physiological properties for fast, secure and precise neurotransmission, such as giant synapses, voltage-gated K+ channels and fast AMPA receptors. Based on the independent evolution of the middle ear in these two vertebrate lineages, on different embryonic origins of the nuclei and on marked differences on the circuit level, these similarities are assumed to reflect convergent evolution. Independent acquisition of similar phenotypes can be produced by divergent evolution of genetic mechanisms or by similar molecular mechanisms...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27820927/south-american-weakly-electric-fish-gymnotiformes-are-long-wavelength-sensitive-cone-monochromats
#17
Da-Wei Liu, Ying Lu, Hong Young Yan, Harold H Zakon
Losses of cone opsin genes are noted in animals that are nocturnal or rely on senses other than vision. We investigated the cone opsin repertoire of night-active South American weakly electric fish. We obtained opsin gene sequences from genomic DNA of 3 gymnotiforms (Eigenmannia virescens, Sternopygus macrurus, Apteronotus albifrons) and the assembled genome of the electric eel (Electrophorus electricus). We identified genes for long-wavelength-sensitive (LWS) and medium-wavelength-sensitive cone opsins (RH2) and rod opsins (RH1)...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27788503/seasonal-variation-in-group-size-is-related-to-seasonal-variation-in-neuropeptide-receptor-density
#18
Leah C Wilson, James L Goodson, Marcy A Kingsbury
In many species, seasonal variation in grouping behavior is widespread, with shifts towards territoriality in the breeding season and grouping in the winter. Compared to the hormonal and neural mechanisms of seasonal territorial aggression, the mechanisms that promote seasonal grouping have received little attention. We collected brains in spring and winter from wild-caught males of two species of emberizid sparrows that seasonally flock (the field sparrow, Spizella pusilla, and the dark-eyed junco, Junco hyemalis) and two species that do not seasonally flock (the song sparrow, Melospiza melodia, and the eastern towhee, Pipilo erythrophthalmus)...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27771730/spatiotemporal-development-of-the-orexinergic-hypocretinergic-system-in-the-central-nervous-system-of-xenopus-laevis
#19
Jesús M López, Lorena Morales, Agustín González
The present immunohistochemical study represents a detailed spatiotemporal analysis of the localization of orexin-immunoreactive (OX-ir) cells and fibers throughout development in the brain of the anuran amphibian Xenopus laevis, a model frequently used in developmental studies. Anurans undergo remarkable physiological changes during the early life stages, and very little is known about the ontogeny and the localization of the centers that control functions such as appetite and feed ingestion in the developing brain...
2016: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/27732977/the-neocortex-of-indian-river-dolphins-genus-platanista-comparative-qualitative-and-quantitative-analysis
#20
Julian P Knopf, Patrick R Hof, Helmut H A Oelschläger
We investigated the morphology of four primary neocortical projection areas (somatomotor, somatosensory, auditory, visual) qualitatively and quantitatively in the Indian river dolphins (Platanista gangetica gangetica, P. gangetica minor) with histological and stereological methods. For comparison, we included brains of other toothed whale species. Design-based stereology was applied to the primary neocortical areas (M1, S1, A1, V1) of the Indian river dolphins and compared to those of the bottlenose dolphin with respect to layers III and V...
2016: Brain, Behavior and Evolution
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