| Records |
| Author |
Regolin, L.; Marconato, F.; Vallortigara, G. |
| Title |
Hemispheric differences in the recognition of partly occluded objects by newly hatched domestic chicks (Gallus gallus) |
Type |
Journal Article |
| Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
| Volume |
7 |
Issue |
3 |
Pages |
162-170 |
| Keywords |
Animals; Discrimination Learning/physiology; Dominance, Cerebral/*physiology; Female; Form Perception/*physiology; Imprinting (Psychology)/*physiology; Pattern Recognition, Visual/*physiology; Photic Stimulation; Random Allocation; Vision, Monocular/*physiology |
Abstract  |
Domestic chicks are capable of perceiving as a whole objects partly concealed by occluders (“amodal completion”). In previous studies chicks were imprinted on a certain configuration and at test they were required to choose between two alternative versions of it. Using the same paradigm we now investigated the presence of hemispheric differences in amodal completion by testing newborn chicks with one eye temporarily patched. Separate groups of newly hatched chicks were imprinted binocularly: (1) on a square partly occluded by a superimposed bar, (2) on a whole or (3) on an amputated version of the square. At test, in monocular conditions, each chick was presented with a free choice between a complete and an amputated square. In the crucial condition 1, chicks tested with only their left eye in use chose the complete square (like binocular chicks would do); right-eyed chicks, in contrast, tended to choose the amputated square. Similar results were obtained in another group of chicks imprinted binocularly onto a cross (either occluded or amputated in its central part) and required to choose between a complete or an amputated cross. Left-eyed and binocular chicks chose the complete cross, whereas right-eyed chicks did not choose the amputated cross significantly more often. These findings suggest that neural structures fed by the left eye (mainly located in the right hemisphere) are, in the chick, more inclined to a “global” analysis of visual scenes, whereas those fed by the right eye seem to be more inclined to a “featural” analysis of visual scenes. |
| Address |
Department of General Psychology, University of Padova, Via Venezia 8, 35131, Padova, Italy. lucia.regolin@unipd.it |
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English |
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1435-9448 |
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| Notes |
PMID:15241654 |
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no |
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Equine Behaviour @ team @ |
Serial |
2519 |
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| Author |
Virányi, Z.; Topál, J.; Gácsi, M.; Miklósi, Á.; Csányi, V. |
| Title |
Dogs respond appropriately to cues of humans' attentional focus |
Type |
Journal Article |
| Year |
2004 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
66 |
Issue |
2 |
Pages |
161-172 |
| Keywords |
Animals; *Attention; Bonding, Human-Pet; Communication; *Cues; Dogs; Humans; Recognition (Psychology) |
| Abstract |
Dogs' ability to recognise cues of human visual attention was studied in different experiments. Study 1 was designed to test the dogs' responsiveness to their owner's tape-recorded verbal commands (Down!) while the Instructor (who was the owner of the dog) was facing either the dog or a human partner or none of them, or was visually separated from the dog. Results show that dogs were more ready to follow the command if the Instructor attended them during instruction compared to situations when the Instructor faced the human partner or was out of sight of the dog. Importantly, however, dogs showed intermediate performance when the Instructor was orienting into 'empty space' during the re-played verbal commands. This suggests that dogs are able to differentiate the focus of human attention. In Study 2 the same dogs were offered the possibility to beg for food from two unfamiliar humans whose visual attention (i.e. facing the dog or turning away) was systematically varied. The dogs' preference for choosing the attentive person shows that dogs are capable of using visual cues of attention to evaluate the human actors' responsiveness to solicit food-sharing. The dogs' ability to understand the communicatory nature of the situations is discussed in terms of their social cognitive skills and unique evolutionary history. |
| Address |
Department of Ethology, Eotvos Lorand University, Budapest, Hungary. zsofi.viranyi@freemail.hu |
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English |
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0376-6357 |
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| Notes |
PMID:15110918 |
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no |
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Equine Behaviour @ team @ |
Serial |
4957 |
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| Author |
Scheumann, M.; Call, J. |
| Title |
The use of experimenter-given cues by South African fur seals (Arctocephalus pusillus) |
Type |
Journal Article |
| Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
| Volume |
7 |
Issue |
4 |
Pages |
224-230 |
| Keywords |
Animal Communication; Animals; *Association Learning; *Cues; Female; Fur Seals/*psychology; *Gestures; Humans; *Imitative Behavior; Nonverbal Communication; Social Behavior; Species Specificity |
| Abstract |
Dogs can use a variety of experimenter-given cues such as pointing, head direction, and eye direction to locate food hidden under one of several containers. Some authors have proposed that this is a result of the domestication process. In this study we tested four captive fur seals in a two alternative object choice task in which subjects had to use one of the following experimenter-given cues to locate the food: (1) the experimenter pointed and gazed at one of the objects, (2) the experimenter pointed at only one of the objects, (3) the experimenter gazed at only one of the objects, (4) the experimenter glanced at only one of the objects, (5) the experimenter pointed and gazed at one of the objects but was sitting closer to one object than to the other, (6) the experimenter pointed only with the index finger at one of the objects, (7) the experimenter presented a replica of one of the objects. The fur seals were able to use cues which involved a fully exposed arm or a head direction, but failed to use glance only, the index finger pointing and the object replica cues. The results showed that a domestication process was not necessary to develop receptive skills to cues given by an experimenter. Instead, we hypothesize that close interactions with humans prior to testing enabled fur seals to uses ome gestural cues without formal training. We also analyzed the behavior of the seals depending on the level of difficulty of the task. Behavioral signs of hesitation increased with task difficulty. This suggests that the fur seals were sensitive to task difficulty. |
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Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany. Marina.Scheumann@tiho-hannover.de |
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English |
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1435-9448 |
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| Notes |
PMID:15057598 |
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no |
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Equine Behaviour @ team @ |
Serial |
2536 |
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| Author |
Uller, C. |
| Title |
Disposition to recognize goals in infant chimpanzees |
Type |
Journal Article |
| Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
| Volume |
7 |
Issue |
3 |
Pages |
154-161 |
| Keywords |
Analysis of Variance; Animals; Female; Fixation, Ocular; *Goals; *Intention; Male; Pan troglodytes/*psychology; Pattern Recognition, Visual; *Problem Solving; *Recognition (Psychology) |
| Abstract |
Do nonhuman primates attribute goals to others? Traditional studies with chimpanzees provide equivocal evidence for “mind reading” in nonhuman primates. Here we adopt looking time, a methodology commonly used with human infants to test infant chimpanzees. In this experiment, four infant chimpanzees saw computer-generated stimuli that mimicked a goal-directed behavior. The baby chimps performed as well as human infants, namely, they were sensitive to the trajectories of the objects, thus suggesting that chimpanzees may be endowed with a disposition to understand goal-directed behaviors. The theoretical implications of these results are discussed. |
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Department of Psychology, University of Essex, Wivenhoe Park, C04 3SQ, Colchester, UK. uller40@yahoo.com |
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1435-9448 |
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| Notes |
PMID:14685823 |
Approved |
no |
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Equine Behaviour @ team @ |
Serial |
2546 |
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| Author |
Emery, N.J.; Clayton, N.S. |
| Title |
The Mentality of Crows: Convergent Evolution of Intelligence in Corvids and Apes |
Type |
Journal Article |
| Year |
2004 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
306 |
Issue |
5703 |
Pages |
1903-1907 |
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| Abstract |
Discussions of the evolution of intelligence have focused on monkeys and apes because of their close evolutionary relationship to humans. Other large-brained social animals, such as corvids, also understand their physical and social worlds. Here we review recent studies of tool manufacture, mental time travel, and social cognition in corvids, and suggest that complex cognition depends on a “tool kit” consisting of causal reasoning, flexibility, imagination, and prospection. Because corvids and apes share these cognitive tools, we argue that complex cognitive abilities evolved multiple times in distantly related species with vastly different brain structures in order to solve similar socioecological problems. |
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| Notes |
10.1126/science.1098410 |
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no |
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Equine Behaviour @ team @ |
Serial |
2959 |
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Huebener, E. |
| Title |
Die Bewegungen von Pferderumpf und -rücken aus der Sicht des Reiters |
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Journal Article |
| Year |
2004 |
Publication |
Tierärztliche Umschau |
Abbreviated Journal |
Tierärztl. Umschau |
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6 |
Issue |
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Pages |
327-334 |
| Keywords |
Schritt – Trab – Galopp – Schmerz – Schäden |
| Abstract |
Die Bewegungen von Rumpf und Rücken des Pferdes in der Fortbewegung bestimmen Sitz und Schenkelhilfen – Grundlagen pferdgerechten und kultivierten, feinfühligen Reitens. In ihrer Tendenz ließen sich diese Bewegungen jetzt aus den Fußfolgen der Grundgangarten ableiten. Die Erkenntnisse sind per Video verifiziert. Mit ihrer Übersetzung in Diagramme wurde versucht, den gegenwärtigen Wissensstand für nicht-reitende Wissenschaftler und denkende Reiter gleichermaßen verständlich darzustellen. Die Akzeptanz des aufbereiteten Wissens in der Reiterei würde verbessert, wenn man zu gemessenen Werten für die Bewegungen des Pferderückens und des Pferderumpfes käme. Plädoyer eines “Nur-Reiters” für einschlägige, universitäre Forschung. |
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German |
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no |
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refbase @ user @ |
Serial |
420 |
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Slater, P.; Rosenblatt, J.; Snowdon, C.; Roper, T. |
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Advances In The Study Of Behavior, 34 |
Type |
Journal Article |
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2004 |
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34 |
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DescriptionThe aim of Advances in the Study of Behavior remains as it has been since the series began: to serve the increasing number of scientists who are engaged in the study of animal behavior by presenting their theoretical ideas and research to their colleagues and to those in neighboring fields. We hope that the series will continue its “contribution to the development of the field”, as its intended role was phrased in the Preface to the first volume in 1965. Since that time, traditional areas of animal behavior have achieved new vigor by the links they have formed with related fields and by the closer relationship that now exists between those studying animal and human subjects. Advances in the Study of Behavior, Volume 31 continues to serve scientists across a wide spectrum of disciplines. Focusing on new theories and research developments with respect to behavioral ecology, evolutionary biology, and comparative psychology, these volumes foster cooperation and communications in these dense fields.AudienceExperimental psychologists studying animal behavior, comparative psychologists, ethologists, evolutionary biologists, and ichthyologists.ContentsContributors. Preface.M.L. East and H. Hofer, Conflict and Co-operation in a Female Dominated Society: A Re-assessment of the “Hyper-aggressive” Image of Spotted Hyenas.C. ten Cate, H. Slabbekoorn, and M.R. Ballintijn, Bird Song and Male-male Competition: Causes and Consequences of Vocal Variability in the Collared Dove (Streptopelia Decaocto).R.W. Byrne, Imitation of Novel Complex Actions: What Does the Evidence from Animals Mean?L.J. Rogers, Lateralization in Vertebrates: Its Early Evolution, General Pattern and Development.S.H. Hulse, Auditory Scene Analysis in Animal Communication.P.K. Stoddard, Electric Signals: Predation, Sex, and Environmental Constraints.T. Aubin and P. Jouventin, How to Vocally Identify Kin in a Crowd: The Penguin Model. Index. Contents of Previous Volumes. |
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Academic Press |
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978-0-12-004534-1 |
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Equine Behaviour @ team @ Slater2004 |
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5991 |
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Milo, R.; Itzkovitz, S.; Kashtan, N.; Levitt, R.; Shen-Orr, S.; Ayzenshtat, I.; Sheffer, M.; Alon, U. |
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Superfamilies of Evolved and Designed Networks |
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Journal Article |
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2004 |
Publication |
Science |
Abbreviated Journal |
Science |
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303 |
Issue |
5663 |
Pages |
1538-1542 |
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Complex biological, technological, and sociological networks can be of very different sizes and connectivities, making it difficult to compare their structures. Here we present an approach to systematically study similarity in the local structure of networks, based on the significance profile (SP) of small subgraphs in the network compared to randomized networks. We find several superfamilies of previously unrelated networks with very similar SPs. One superfamily, including transcription networks of microorganisms, represents “rate-limited” information-processing networks strongly constrained by the response time of their components. A distinct superfamily includes protein signaling, developmental genetic networks, and neuronal wiring. Additional superfamilies include power grids, protein-structure networks and geometric networks, World Wide Web links and social networks, and word-adjacency networks from different languages. |
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10.1126/science.1089167 |
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Equine Behaviour @ team @ |
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5033 |
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DiGian, K.A.; Friedrich, A.M.; Zentall, T.R. |
| Title |
Discriminative stimuli that follow a delay have added value for pigeons |
Type |
Journal Article |
| Year |
2004 |
Publication |
Psychonomic bulletin & review |
Abbreviated Journal |
Psychon Bull Rev |
| Volume |
11 |
Issue |
5 |
Pages |
889-895 |
| Keywords |
Animals; Behavior, Animal; Choice Behavior; Columbidae; *Cues; *Discrimination (Psychology) |
| Abstract |
Clement, Feltus, Kaiser, and Zentall (2000) reported that pigeons prefer discriminative stimuli that require greater effort (more pecks) to obtain over those that require less effort. In the present experiment, we examined two variables associated with this phenomenon. First, we asked whether delay of reinforcement, presumably a relatively aversive event similar to effort, would produce similar effects. Second, we asked whether the stimulus preference produced by a prior relatively aversive event depends on its anticipation. Anticipation of delay was accomplished by signaling its occurrence. Results indicated that delays can produce preferences similar to those produced by increased effort, but only if the delays are signaled. |
| Address |
University of Kentucky, Lexington, Kentucky 40506-0044, USA |
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English |
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1069-9384 |
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PMID:15732699 |
Approved |
no |
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refbase @ user @ |
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226 |
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Beran, M.J.; Pate, J.L.; Washburn, D.A.; Rumbaugh, D.M. |
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Sequential responding and planning in chimpanzees (Pan troglodytes) and rhesus macaques (Macaca mulatta) |
Type |
Journal Article |
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2004 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
| Volume |
30 |
Issue |
3 |
Pages |
203-212 |
| Keywords |
Animals; *Cognition; Female; Goals; Learning; Macaca mulatta/*psychology; Male; *Mathematics; Pan troglodytes/*psychology; Task Performance and Analysis |
| Abstract |
Chimpanzees (Pan troglodytes) and rhesus macaques (Macaca mulatta) selected either Arabic numerals or colored squares on a computer monitor in a learned sequence. On shift trials, the locations of 2 stimuli were interchanged at some point. More errors were made when this interchange occurred for the next 2 stimuli to be selected than when the interchange was for stimuli later in the sequence. On mask trials, all remaining stimuli were occluded after the 1st selection. Performance exceeded chance levels for only 1 selection after these masks were applied. There was no difference in performance for either stimulus type (numerals or colors). The data indicated that the animals planned only the next selection during these computerized tasks as opposed to planning the entire response sequence. |
| Address |
Language Research Center, Georgia State University, Atlanta 30303, USA. mjberan@yahoo.com |
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English |
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0097-7403 |
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PMID:15279511 |
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no |
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Equine Behaviour @ team @ |
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2767 |
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