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| Author |
Visalberghi E; Tomasello M |
| Title |
Primate causal understanding in the physical and psychological domains |
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Journal Article |
| Year |
1998 |
Publication  |
Behav. Process. |
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42 |
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189 |
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Equine Behaviour @ team @ |
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3079 |
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| Author |
Wanker, R.; Apcin, J.; Jennerjahn, B.; Waibel, B. |
| Title |
Discrimination of different social companions in spectacled parrotlets ( Forpus conspicillatus ): evidence for individual vocal recognition |
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Journal Article |
| Year |
1998 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
| Volume |
43 |
Issue |
3 |
Pages |
197-202 |
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Abstract: Individual recognition is generally assumed to be a prerequisite for establishing and maintaining a complex social system. Indeed, there is good evidence that highly social species have complex systems of vocal communication with individual recognition by acoustic cues. In this study, we provide experimental evidence that vocal class and individual recognition is present in a non-passerine bird, the spectacled parrotlet (Forpus conspicillatus). Spectacled parrotlets live in a complex system of social relationships. Soon after fledging, the young establish close sibling relationships which are important for successful socialization, pairing and reproduction. In a series of playback experiments we tested if spectacled parrotlets use contact calls for vocal recognition. The results showed that spectacled parrotlets discriminate between the contact calls of different social categories. Adult birds preferred to respond to the contact calls of their mates. Subadult individuals recognized the contact calls of their siblings. During the period of pair bond formation, the affiliative contacts to the siblings decrease, but the parrotlets continue to respond to the calls of their siblings. This is the first evidence that vocal sibling recognition might outlast the period of strong sibling interaction and extends into the period of pair bond formation. In cases of mate loss or divorce, the acoustic contact to their siblings might facilitate the re-establishment of close sibling relationships. |
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Equine Behaviour @ team @ |
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4571 |
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Matsumura, S.; Kobayashi, T. |
| Title |
A game model for dominance relations among group-living animals |
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Journal Article |
| Year |
1998 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
| Volume |
42 |
Issue |
2 |
Pages |
77-84 |
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Dominance – Hawk-dove games – Resource-holding potential – Asymmetry – Evolutionarily stable strategy |
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Abstract We present here an attempt to understand behaviors of dominant individuals and of subordinate individuals as behavior strategies in an asymmetric “hawk-dove” game. We assume that contestants have perfect information about relative fighting ability and the value of the resource. Any type of asymmetry, both relevant to and irrelevant to the fighting ability, can be considered. It is concluded that evolutionarily stable strategies (ESSs) depend on the resource value (V), the cost of injury (D), and the probability that the individual in one role will win (x). Different ESSs can exist even when values of V, D, and x are the same. The characteristics of dominance relations detected by observers may result from the ESSs that the individuals are adopting. The model explains some characteristics of dominance relations, for example, the consistent outcome of contests, the rare occurrence of escalated fights, and the discrepancy between resource holding potential (RHP) and dominance relations, from the viewpoint of individual selection. |
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Equine Behaviour @ team @ |
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5102 |
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Sutton J.E.; Roberts W.A. |
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Do pigeons show incidental timing? Some experiments and a suggested hierarchical framework for the study of attention in animal cognition |
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Journal Article |
| Year |
1998 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
44 |
Issue |
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Pages |
263-275 |
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refbase @ user @ |
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3463 |
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Byrne, T.; Sutphin, G.; Poling, A. |
| Title |
Acquisition, extinction, and reacquisition of responding with delayed and immediate reinforcement |
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Journal Article |
| Year |
1998 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
43 |
Issue |
1 |
Pages |
97-101 |
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Acquisition; Delayed reinforcement; Extinction; Rats |
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The present study investigated acquisition, extinction, and reacquisition of free-operant responding when rats' lever presses produced water after a resetting delay of 0, 10, 20, or 30 s. Results indicated that: (1) responding was acquired rapidly at all delays without shaping or autoshaping; (2) resistance to extinction was directly related to delay length and inversely related to intermittency of reinforcement; (3) responding acquired with delayed reinforcement recovered less rapidly from extinction, and was less efficient, than responding acquired with immediate reinforcement. Comparing these results with those of studies using discrete-trials and free-operant procedures with no reinforcement delay suggest that the specific conditions under which behavior is maintained determines, in part, the behavioral effects of delay and intermittency of reinforcement. |
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Equine Behaviour @ team @ |
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3601 |
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Duncan, I.J.H.; Widowski, T.M.; Malleau, A.E.; Lindberg, A.C.; Petherick, J.C. |
| Title |
External factors and causation of dustbathing in domestic hens |
Type |
Journal Article |
| Year |
1998 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
43 |
Issue |
2 |
Pages |
219-228 |
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Dustbathing; Illumination; Laying hens; Radiant heat; Social facilitation; Temperature |
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Dustbathing is known to be motivated by complex interactions between internal factors which build up over time and external factors, such as the sight of a dusty substrate. In this study, the effects of other external factors were investigated. Environmental temperature was shown to be important; frequencies of dustbathing were greater when hens were held at 22 than at 10[degree sign]C (P<0.01). In a second experiment, a radiant heat source or a radiant heat+light source, balanced to give the same radiant heat, resulted in more dustbathing behaviour during a 1-h stimulus period than during the same period with no stimulus (P<0.05). Components of dustbathing were increased more by the heat+light stimulus than by the heat stimulus alone (P<0.03). In a third experiment, the amount of dustbathing performed by individual hens in cages with dustbaths was increased by the presence of a group of hens dustbathing in an adjoining pen with a dustbath compared with the amount occurring when the hens were absent from the pen. |
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Equine Behaviour @ team @ |
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3607 |
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| Author |
Peters, G.; Tembrock, G. |
| Title |
Subharmonics, biphonation, and deterministic chaos in mammal vocalizations |
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Journal Article |
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1998 |
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Bioacoustics |
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9 |
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Equine Behaviour @ team @ Peters1998 |
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6483 |
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| Author |
Breitenmoser, U. |
| Title |
Large predators in the Alps: the fall and rise of man's competitors |
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Journal Article |
| Year |
1998 |
Publication |
Biol Conserv |
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83 |
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Equine Behaviour @ team @ Breitenmoser1998 |
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6450 |
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Mesulam, M.-M. |
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Review article. From sensation to cognition |
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Journal Article |
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1998 |
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Brain |
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121 |
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1013-1052 |
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refbase @ user @ |
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3467 |
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| Author |
Wittling, W.; Block, A.; Schweiger, E.; Genzel, S. |
| Title |
Hemisphere Asymmetry in Sympathetic Control of the Human Myocardium |
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Journal Article |
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1998 |
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Brain and Cognition |
Abbreviated Journal |
Brain Cogn. |
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38 |
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1 |
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17-35 |
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Hemisphere asymmetry in sympathetic control of myocardial performance was studied in healthy human subjects using lateralized film presentation for selective sensory stimulation of the hemispheres and impedance cardiography for the evaluation of cardiac output, systolic time intervals and myocardial contractility. Results revealed a clear and consistent right hemisphere predominance in sympathetically mediated control of various components of myocardial performance. There is reason to assume that the obtained hemisphere differences in autonomic control of the heart are self-reliant processes not depending on emotion-related hemisphere asymmetry. As far as we know, this is the first study examining the distinct roles of the cerebral hemispheres in neural control of ventricular myocardial functions. |
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0278-2626 |
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Equine Behaviour @ team @ |
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5351 |
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