| Records |
| Author |
Sawaguchi, T.; Kudo, H. |
Title  |
Neocortical development and social structure in primates |
Type |
Journal Article |
| Year |
1990 |
Publication |
Primates |
Abbreviated Journal |
Primates |
| Volume |
31 |
Issue |
2 |
Pages |
283-289 |
| Keywords |
Neocortex – Relative size – Allometry – Congeneric group – Social structure – Monogyny – Polygyny – Primates |
| Abstract |
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 @ |
Serial |
4799 |
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| Author |
Wittling, W.; Pflüger, M. |
| Title |
Neuroendocrine hemisphere asymmetries: Salivary cortisol secretion during lateralized viewing of emotion-related and neutral films |
Type |
Journal Article |
| Year |
1990 |
Publication |
Brain and Cognition |
Abbreviated Journal |
Brain Cogn. |
| Volume |
14 |
Issue |
2 |
Pages |
243-265 |
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| Abstract |
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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| Author |
Reboreda, J.C.; Kacelnik, A. |
| Title |
On cooperation, tit-for-tat and mirros |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
6 |
Pages |
1188-1189 |
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2117 |
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Smith, S.F.; Appleby, M.C.; Hughes, B.O. |
| Title |
Problem solving by domestic hens: opening doors to reach nest sites |
Type |
Journal Article |
| Year |
1990 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
28 |
Issue |
3 |
Pages |
287-292 |
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In a trial of cage designs for laying hens, eggs were discovered in dust baths where access was restricted by a closed door during the normal laying period (08:00-13:00 h). Observations showed that the hens in these dust bath treatments had developed methods of opening the doors in order to lay in the baths. Three different methods of opening were observed. An average time of 34.4 min was spent attempting to open the doors before access was finally achieved. This implies a strong nesting motivation in these hens. The proportion of eggs laid in the dust baths increased (with occasional fluctuations) over a 24-week period. Door opening is likely to have initially developed in one individual in each cage through a trial and error basis, and then have been learned by cage mates through imitation. The speed and efficiency of door opening was not found to increase with experience or time. |
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0168-1591 |
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no |
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Equine Behaviour @ team @ |
Serial |
6164 |
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| Author |
Wittling, W. |
| Title |
Psychophysiological correlates of human brain asymmetry: Blood pressure changes during lateralized presentation of an emotionally laden film |
Type |
Journal Article |
| Year |
1990 |
Publication |
Neuropsychologia |
Abbreviated Journal |
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| Volume |
28 |
Issue |
5 |
Pages |
457-470 |
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Fifty adult subjects were shown an emotionally positive film either in their left or right hemisphere by means of a technique for lateralizing visual input that allows prolonged viewing while permitting free ocular scanning. It was found that the cerebral hemispheres markedly differ in their capability to regulate blood pressure during emotionally laden situations of a distinctly positive nature. Right-hemispheric film presentation caused a significantly higher increase in systolic and diastolic pressure that left-hemispheric viewing of the same film. Moreover, hemisphere asymmetries were further increased if lateralized stimulus presentation and the lateralized carrying out of a stimulus-related response were combined within the same hemisphere, thereby enhancing unilateral processing. Finally, males and females clearly differed with respect to interhemispheric regulation of blood pressure. |
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0028-3932 |
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no |
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Equine Behaviour @ team @ |
Serial |
5352 |
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| Author |
Petherick, J.C.; Rutter, S.M. |
| Title |
Quantifying motivation using a computer-controlled push-door |
Type |
Journal Article |
| Year |
1990 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
27 |
Issue |
1 |
Pages |
159-167 |
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A computer-controlled push-door system was designed and tested as a method for measuring motivation. Eleven domestic hens were trained to use the push-door to gain access to food. They were deprived of food for 12 h or 43 h on 12 occasions and the push-door was used to measure the amount of “work” (measured as force × time) that they performed to gain access to a food reward. When deprived of food for 12 h the hens took significantly longer (P<0.01) to reach the required threshold of work, than when deprived for 43 h. This difference arose from the amount of time that the hens spent not pushing at the door. The problems encountered with this system and such an approach to measuring motivation are discussed. |
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0168-1591 |
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no |
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Equine Behaviour @ team @ |
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6165 |
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Kacelnik, A. |
| Title |
R.C. Bolies and M.D. Beecher, Editors, Evolution and Learning, Lawrence Erlbaum, Hillsdale, New Jersey (1988), p. x |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
3 |
Pages |
602-603 |
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2119 |
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| Author |
Schilder, M.B.H. |
| Title |
Social behaviour and social arganization of a herd of plains zebra in a safari park |
Type |
Manuscript |
| Year |
1990 |
Publication |
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Ph.D. thesis |
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University of Utrecht |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1566 |
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| Author |
Janson, C.H. |
| Title |
Social correlates of individual spatial choice in foraging groups of brown capuchin monkeys, Cebus apella |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
5 |
Pages |
910-921 |
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Individuals in a foraging group of wild bronwn capuchin monkeys choose different spatial positions relative to the rest of the group. Markov analysis of sequencess of individual spatial positions demonstrated significant differnces between individuals, which coul be categorized a posteriori into four homogenous subgroups. An individual's spatial position was related primarily to the amount of aggression it received from the group's dominant male, but also varied with its sex. Spatial choice varied with changes in an individual's social status, but did not vary consistently with seasonal differences in food availability. These results support the hypothesis that individuals compete for preferred spatial positions within a foraging group. |
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no |
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refbase @ user @ |
Serial |
773 |
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| Author |
Iacobucci, D.; Wasserman, S. |
| Title |
Social networks with two sets of actors |
Type |
Journal Article |
| Year |
1990 |
Publication |
Psychometrika |
Abbreviated Journal |
Psychometrika |
| Volume |
55 |
Issue |
4 |
Pages |
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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