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Sawaguchi, T.; Kudo, H. |
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Title |
Neocortical development and social structure in primates |
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Journal Article |
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Year |
1990 |
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Primates |
Abbreviated Journal |
Primates |
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31 |
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2 |
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283-289 |
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Neocortex – Relative size – Allometry – Congeneric group – Social structure – Monogyny – Polygyny – Primates |
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Abstract  The relationships between the relative size of the neocortex and differences in social structures were examined in prosimians and anthropoids. The relative size of the neocortex (RSN) of a given congeneric group in each superfamily of primates was measured based on the allometric relationships between neocortical volume and brain weight for each superfamily, to control phylogenetic affinity and the effects of brain size. In prosimians, “troop-making” congeneric groups (N=3) revealed a significantly larger RSN than solitary groups (N=6), and there was a significant, positive correlation between RSN and troop size. In the case of anthropoids, polygynous/frugivorous groups (N=5) revealed a significantly larger RSN than monogynous/frugivorous groups (N=8). Furthermore, a significant, positive correlation between RSN and troop size was found for frugivorous congeneric groups of the Ceboidea. These results suggest that neocortical development is associated with differences in social structure among primates. |
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Equine Behaviour @ team @ |
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4799 |
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Cheney, D.L.; Seyfarth, R.M. |
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How Monkeys See the World |
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Miscellaneous |
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1990 |
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Equine Behaviour @ team @ |
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4866 |
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Author |
Cords, M. |
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13th Cong. Int. Primat Soc |
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1990 |
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Equine Behaviour @ team @ |
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4925 |
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Iacobucci, D.; Wasserman, S. |
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Title |
Social networks with two sets of actors |
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1990 |
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Psychometrika |
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Psychometrika |
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55 |
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4 |
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707-720 |
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Abstract Traditional network research analyzes relational ties within a single group of actors: the models presented in this paper involve relational ties exist beteen two distinct sets of actors. Statistical models for traditional networks in which relations are measured within a group simplify when modeling unidirectional relations measured between groups. The traditional paradigm results in a one-mode socionatrix; the network paradigm considered in this paper results in a two-mode socionatrix; A statistical model is presented, illustrated on a sample data set, and compared to its traditional counterpart. Extensions are discussed, including those that model multivariate relations simultaneously, and those that allow for the inclustion of attributes of the individuals in the group. |
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Equine Behaviour @ team @ |
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5036 |
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Author |
Hemelrijk, C.K. |
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Title |
Models of, and tests for, reciprocity, unidirectionality and other social interaction patterns at a group level |
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Year |
1990 |
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Animal Behaviour. |
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Anim. Behav. |
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39 |
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6 |
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1013-1029 |
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Research on reciprocity is impaired by confusing definitions and often wrongly used statistical tests. Here, two models of the mechanism on which reciprocity may be based are discussed and an initial step towards a new fremework for its analysis is presented. A distinction is made between reciprocity and interchange. In the case of reciprocity, for one kind of act the same kind is received in return. In interchange, however, two different kinds of acts are bartered. Three types of reciprocity/interchange in social actions among all pairs of group-members are distinguished ([`]qualitative', [`]relative' and [`]absolute') on the basis of the precision of the reciprocity/interchange. Permutation procedures for association between matrices (such as the Mantel Z and two other newly derived tests) are used as a statistical test for detecting reciprocity/interchange. A rough comparison of the power of the two new tests is included. The tests can be applied to all kinds of group-living animals and to all sorts of social behaviour. The distinction between the three types of reciprocity/interchange and the matching statistical methods are also useful for defining and detecting other patterns in social interactions, like unidirectionality and associations between different kinds of social behaviour. The influence on social interactions of variables like dominance rank, age and sex can be analysed in the three forms by testing correlations between invented matrices which represent the influence of these variables (the so-called hypothesis matrices) and social interaction matrices. These methods are extended for two categories of individuals, thus allowing the investigation of, for example, reciprocity between males and females. The methods are illustrated with examples of coalition formation and grooming behaviour among captive chimpanzees, Pan troglodytes. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5049 |
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Author |
Hemelrijk C K |
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Title |
A matrix partial correlation test used in investigations of reciprocity and other social interaction patterns at group level |
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Journal Article |
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Year |
1990 |
Publication |
Journal of theoretical biology |
Abbreviated Journal |
J. Theor. Biol. |
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143 |
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3 |
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405-420 |
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Reciprocity and other social interaction patterns can be studied at two levels, within pairs (i.e. dyadic level) and among pairs (i.e. at group level). In this paper advantages of the latter approach are emphasized. However, an analysis at group level implies the correlation of interaction matrices and because such data are statistically dependent, the significance of a correlation has to be calculated in a special way |
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Equine Behaviour @ team @ |
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5050 |
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Author |
Tomasello, M. |
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Title |
Cultural transmission in the tool use and communicatory signalling of chimpanzees? |
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Year |
1990 |
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Language and Intelligence in Monkeys and Apes. |
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274-311 |
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Cambridge University Press |
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Cambridge |
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Parker,S.T.;Gibson,K.R. |
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Equine Behaviour @ team @ |
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5267 |
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Hostikka, S.L.; Eddy, R.L.; Byers, M.G.; Hoyhtya, M.; Shows, T.B.; Tryggvason, K. |
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Identification of a distinct type IV collagen alpha chain with restricted kidney distribution and assignment of its gene to the locus of X chromosome-linked Alport syndrome |
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Journal Article |
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1990 |
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Proceedings of the National Academy of Sciences of the United States of America |
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Proc. Natl. Acad. Sci. U.S.A. |
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87 |
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4 |
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1606-1610 |
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Amino Acid Sequence; Base Sequence; Chromosome Mapping; Cloning, Molecular; Collagen/*genetics; Epitopes/analysis; Female; Fluorescent Antibody Technique; Gene Library; *Genes; Humans; Immunoblotting; Kidney/cytology/*metabolism; Macromolecular Substances; Molecular Sequence Data; Nephritis, Hereditary/*genetics; Oligopeptides/chemical synthesis/immunology; Placenta/metabolism; Pregnancy; Restriction Mapping; Sequence Homology, Nucleic Acid; *X Chromosome |
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We have identified and extensively characterized a type IV collagen alpha chain, referred to as alpha 5(IV). Four overlapping cDNA clones isolated contain an open reading frame for 543 amino acid residues of the carboxyl-terminal end of a collagenous domain, a 229-residue carboxyl-terminal noncollagenous domain, and 1201 base pairs coding for a 3' untranslated region. The collagenous Gly-Xaa-Yaa repeat sequence has five imperfections that coincide with those in the corresponding region of the alpha 1(IV) chain. The noncollagenous domain has 12 conserved cysteine residues and 83% and 63% sequence identity with the noncollagenous domains of the alpha 1(IV) and alpha 2(IV) chains, respectively. The alpha 5(IV) chain has less sequence identity with the putative bovine alpha 3(IV) and alpha 4(IV) chains. Antiserum against an alpha 5(IV) synthetic peptide stained a polypeptide chain of about 185 kDa by immunoblot analysis and immunolocalization of the chain in human kidney was almost completely restricted to the glomerulus. The gene was assigned to the Xq22 locus by somatic cell hybrids and in situ hybridization. This may be identical or close to the locus of the X chromosome-linked Alport syndrome that is believed to be a type IV collagen disease. |
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Biocenter, University of Oulu, Finland |
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English |
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0027-8424 |
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PMID:1689491 |
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Equine Behaviour @ team @ |
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5291 |
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Byrne, R.W.; Whiten, A.; Henzi, S.P. |
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Title |
Social relationships of mountain baboons: Leadership and affiliation in a non-female-bonded monkey |
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Journal Article |
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1990 |
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American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
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20 |
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4 |
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313-329 |
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relationships; one-male groups; female-bonding; spacing; support; Papio ursinus; Papio hamadryas |
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Abstract 10.1002/ajp.1350200409.abs Instead of close and differentiated relationships among adult females, the accepted norm for savanna baboons, groups of Drakensberg mountain baboons (Papio ursinus) showed strong affiliation of females towards a single male. The same male was usually the decision-making animal in controlling group movements. Lactating or pregnant females focused their grooming on this “leader” male, producing a radially patterned sociogram, as in the desert baboon (P. hamadryas); the leader male supported young animals in the group against aggression and protected them against external threats. Unlike typical savanna baboons, these mountain baboons rarely displayed approach-retreat or triadic interactions, and entirely lacked coalitions among adult females. Both groups studied were reproductively one-male; male-female relationships in one were like those in a unit of a hamadryas male at his peak, while the other group resembled the unit of an old hamadryas male, who still leads the group, with a male follower starting to build up a new unit and already monopolizing mating. In their mountain environment, where the low population density suggests conditions as harsh for baboons as in deserts, adults in these groups kept unusually large distances apart during ranging; kin tended to range apart, and spacing of adults was greatest at the end of the dry, winter season. These facts support the hypothesis that sparse food is responsible for convergence with hamadryas social organization. It is suggested that all baboons, though matrilocal, are better categorized as “cross-sex-bonded” than “female bonded”. |
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Wiley Subscription Services, Inc., A Wiley Company |
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1098-2345 |
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Equine Behaviour @ team @ |
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5309 |
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Wittling, W.; Pflüger, M. |
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Neuroendocrine hemisphere asymmetries: Salivary cortisol secretion during lateralized viewing of emotion-related and neutral films |
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1990 |
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Brain and Cognition |
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Brain Cogn. |
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14 |
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2 |
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243-265 |
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The study set out to examine whether the cerebral hemispheres differ in their ability to regulate cortisol secretion during emotion-related situations. One hundred twenty-three adult subjects were shown either an emotionally aversive or a neutral film in the left or right hemisphere by means of a technique for lateralizing visual input that allows prolonged viewing while permitting free ocular scanning. The film-related changes of cortisol secretion were determined by salivary cortisol radioimmunoassay. Right hemispheric viewing of the emotionally aversive film resulted in a significantly higher increase of cortisol secretion than left hemispheric viewing of the same film. No such differences were observed with respect to the neutral film. Comparing the effects of the two films separately for each hemisphere revealed that only the right hemisphere was able to respond neuroendocrinologically in a different manner to the emotional and the neutral film. Therefore, it is concluded that cortical regulation of cortisol secretion in emotion-related situations is under primary control of the right hemisphere. The potential implications of asymmetric control of cortisol secretion with respect to the pathogenesis of psychosomatic and immunological disorders are discussed. |
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0278-2626 |
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Equine Behaviour @ team @ |
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5350 |
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