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Author |
Shuster, G.; Sherman, P.W. |
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Title |
Tool use by naked mole-rats |
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Journal Article |
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Year |
1998 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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1 |
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71-74 |
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Naked mole-rats (Heterocephalus glaber, Rodentia: Bathyergidae) excavate extensive subterranean burrows with their procumbent incisors. Captive individuals often place a wood shaving or tuber husk behind their incisor teeth and in front of their lips and molar teeth while gnawing on substrates that yield fine particulate debris. This oral barrier may prevent choking or aspiration of foreign material. Consistent use of tools has rarely been reported in rodents. |
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Equine Behaviour @ team @ |
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3367 |
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Author |
McNelis, N.L.; Boatright-Horowitz, S.L. |
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Title |
Social monitoring in a primate group: the relationship between visual attention and hierarchical ranks |
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Journal Article |
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Year |
1998 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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1 |
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1 |
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65-69 |
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Social monitoring has been hypothesized to be an important component of primate social behavior. If the gaze direction of one animal can redirect the gaze of another, visual scanning of conspecifics can provide a more efficient means of locating food or predators than directly scanning the entire nonsocial environment. Social monitoring also allows distance regulation between members of a group, reducing the likelihood of agonistic encounters. Although assessment of gaze direction in freely moving primates is problematic, we were successful in assessing amounts of visual scanning among adult females of a captive, socially housed group of patas monkeys (Erythrocebus patas) using a focal sampling technique with on-the-dot recording (5-s sampling intervals). In study 1, relative amounts of scanning were assessed as subjects gazed at any other member of the group. Percentages of agreement between observers ranged from 80% to 92%, with corresponding s values ranging from 0.74 to 0.92. In study 2, relative amounts of visual scanning were assessed so that specific targets of gaze were identified. The resultant data supported a long-standing prediction about the role of social monitoring in primate group dynamics. Lower-ranking animals gazed toward higher-ranking animals more often than vice versa. Although the specific cues eliciting social monitoring remain to be determined, visual attention in this social primate group appeared to be systematically related to hierarchical ranks, assessed by displacements. Minimally, these results suggest that patas monkeys structure their visual attention based on previous encounters with other members of their social group. While simple discrimination learning could account for these results, the demonstration of a systematic relationship between visual attention and primate social dynamics is relevant to current discussions of a primate's understanding of conspecific gaze direction. |
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Equine Behaviour @ team @ |
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3377 |
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Author |
Byrne, T.; Sutphin, G.; Poling, A. |
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Title |
Acquisition, extinction, and reacquisition of responding with delayed and immediate reinforcement |
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Journal Article |
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Year |
1998 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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43 |
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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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Author |
Mizuguchi, M.; Arai, M.; Ke, Y.; Nitta, K.; Kuwajima, K. |
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Title |
Equilibrium and kinetics of the folding of equine lysozyme studied by circular dichroism spectroscopy |
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Journal Article |
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1998 |
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Journal of Molecular Biology |
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283 |
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265-277 |
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equine lysozyme; protein folding; molten globule; stopped-flow; folding intermediate |
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The equilibrium unfolding and the kinetics of unfolding and refolding of equine lysozyme, a Ca2+-binding protein, were studied by means of circular dichroism spectra in the far and near-ultraviolet regions. The transition curves of the guanidine hydrochloride-induced unfolding measured at 230 nm and 292.5 nm, and for the apo and holo forms of the protein have shown that the unfolding is well represented by a three-state mechanism in which the molten globule state is populated as a stable intermediate. The molten globule state of this protein is more stable and more native-like than that of α-lactalbumin, a homologous protein of equine lysozyme. The kinetic unfolding and refolding of the protein were induced by concentration jumps of the denaturant and measured by stopped-flow circular dichroism. The observed unfolding and refolding curves both agreed well with a single-exponential function. However, in the kinetic refolding reactions below 3 M guanidine hydrochloride, a burst-phase change in the circular dichroism was present, and the burst-phase intermediate in the kinetic refolding is shown to be identical with the molten globule state observed in the equilibrium unfolding. Under a strongly native condition, virtually all the molecules of equine lysozyme transform the structure from the unfolded state into the molten globule, and the subsequent refolding takes place from the molten globule state. The transition state of folding, which may exist between the molten globule and the native states, was characterized by investigating the guanidine hydrochloride concentration-dependence of the rate constants of refolding and unfolding. More than 80% of the hydrophobic surface of the protein is buried in the transition state, so that it is much closer to the native state than to the molten globule in which only 36% of the surface is buried in the interior of the molecule. It is concluded that all the present results are best explained by a sequential model of protein folding, in which the molten globule state is an obligatory folding intermediate on the pathway of folding. |
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refbase @ user @ |
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3990 |
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Author |
Wittling, W.; Block, A.; Schweiger, E.; Genzel, S. |
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Title |
Hemisphere Asymmetry in Sympathetic Control of the Human Myocardium |
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Journal Article |
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Year |
1998 |
Publication |
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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Author |
Schnall, Simone; Gattis,Merideth |
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Title |
Transitive Inference by Visual Reasoning |
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Conference Volume |
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Year |
1998 |
Publication |
Proceedings of the Twentieth Annual Conference of the Cognitive Science Society |
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929-934 |
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Two experiments are reported that investigated the influence
of linear spatial organization on transitive inference
performance. Reward/no-reward relations between
overlapping pairs of elements were presented in a context of
linear spatial order or random spatial order. Participants in
the linear arrangement condition showed evidence for visual
reasoning: They systematically mapped spatial relations to
conceptual relation and used the spatial relations to make
inferences on a reasoning task in a new spatial context. We
suggest that linear ordering may be a “good figure”, by
constituting a parsimonious representation for the integration
of premises, as well as for the inferencing process. The late
emergence of transitive inference in children may be the
result of limited cognitive capacity, which --unless an
external spatial array is available --constrains the
construction of an internal spatial array. |
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refbase @ user @ |
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610 |
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Author |
Schnitzer, U. |
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Title |
Grundsätze der Gymnastizierung des Reitpferdes |
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1998 |
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16 |
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Reiten Lesen Denken @ eberhardhuebener @ |
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1064 |
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Author |
Bürger, U. |
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Title |
The Way to perfect Horsemanship |
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1998 |
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254 |
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The Way to Perfect Horsemanship is an outstanding work in the vast literature devoted to horsemanship. It provides, for the first time, a clear insight into the psychological makeup of the horse, its muscular system, the mechanics of its movement, and the aids to human-to-horse communication. Udo Burger presents his philosophy of riding in a scientific manner, asserting that no one can no more learn to ride without a knowledge of horse physiology and psychology than one can learn the art of medecine without a background in health and disease. He clearly explains what one should feel and do on horseback--ultimately, as if one is part of the horse, completely united with it in all of its movements. Anyone with a genuine empathy for horses--wether teacher, trainer, competitor, or occasional rider--will benefit enormously from reading this classic work on horsemanship. The late Udo Burger was an accomplished horseman and one of Germany's most esteemed equine veterinarians. |
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Trafalgar Square Publishing |
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English |
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978-1570761294 |
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1st English cased ed edition (October 1, 1998) |
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Reiten Lesen Denken @ eberhardhuebener @ |
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1594 |
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Author |
Bouman, I. |
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The reintroduction of Przewalski horses in the Hustain Nuruu Mountain Forest Steppe Reserve in Mongolia |
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1998 |
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Mededelingen: Netherlands Commission for International Nature Protection |
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32 |
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Equine Behaviour @ team @ |
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2241 |
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Author |
Sutton J.E.; Roberts W.A. |
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Title |
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 |
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1998 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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44 |
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263-275 |
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refbase @ user @ |
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3463 |
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