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| Author | Fiset, S.; Beaulieu, C.; Landry, F. | ||||
| Title | Duration of dogs' (Canis familiaris) working memory in search for disappearing objects | Type | Journal Article | ||
| Year | 2003 | Publication | Animal Cognition | Abbreviated Journal | Anim. Cogn. |
| Volume | 6 | Issue | 1 | Pages | 1-10 |
| Keywords | Animals; Dogs/*psychology; *Exploratory Behavior; Female; Male; *Memory; Visual Perception | ||||
| Abstract | Two experiments explored the duration of dogs' working memory in an object permanence task: a delay was introduced between the disappearance of a moving object behind a box and the beginning of the search by the animal. In experiment 1, the dogs were tested with retention intervals of 0, 10, 30, and 60 s. Results revealed that the dogs' accuracy declined as a function of the length of the retention interval but remained above chance for each retention interval. In experiment 2, with new subjects, longer retention intervals (0, 30, 60, 120, and 240 s) were presented to the dogs. Results replicated findings from experiment 1 and revealed that the dogs' accuracy remained higher than chance level with delays up to 240 s. In both experiments, the analysis of errors also showed that the dogs searched as a function of the proximity of the target box and were not subject to intertrial proactive interference. In the discussion, we explore different alternatives to explain why dogs' search behaviour for hidden objects decreased as a function of the retention intervals. | ||||
| Address | Secteur Sciences Humaines, Universite de Moncton, Campus d'Edmundston, E3V 2S8, Edmundston, New Brunswick, Canada. sfiset@umce.ca | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 1435-9448 | ISBN | Medium | ||
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| Notes | PMID:12658530 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 2586 | ||
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| Author | Valero, N. | ||||
| Title | West Nile virus: a new challenge? | Type | Journal Article | ||
| Year | 2003 | Publication | Investigacion Clinica | Abbreviated Journal | Invest Clin |
| Volume | 44 | Issue | 3 | Pages | 175-177 |
| Keywords | Animal Migration; Animals; Bird Diseases/virology; Birds; Caribbean Region; Central America; Culex/virology; Horse Diseases/virology; Horses; Humans; Insect Vectors/virology; North America/epidemiology; South America; West Nile Fever/*epidemiology/transmission/veterinary; West Nile virus/*physiology | ||||
| Abstract | West Nile Virus (WNV), a member of the family Flaviviridae, was first isolated in 1937. Since the original isolation of the WNV outbreaks have occurred with increase in frequency of cases in humans and horses, apparent increase in severe human disease and high avian death rates. In 1999, 2000 and 2002 outbreaks of the WNV encephalitis were reported in horses, birds and humans from New York and Canada. Ornithophilic mosquitoes are the principal vectors of the WNV and birds of several species chiefly migrants appear to be the major introductory or amplifying host. The pattern of outbreaks in the old and new world suggests that viremic migratory birds may also contribute to movement of the virus. If so, Central America, Caribbean Islands and countries of South America including Venezuela, are in potential risk for suffering a severe outbreak for WNV, since several species of birds have populations that pass trough New York and cross the western north Atlantic or Caribbean Sea. It is important the knowledge of the ecology of WNV as well of the efficacy of control efforts in order to minimize the public health impact in these countries, where all population is susceptible to this infection. | ||||
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| Language | Spanish | Summary Language | Original Title | Virus del Nilo Occidental: Un nuevo reto? | |
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| ISSN | 0535-5133 | ISBN | Medium | ||
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| Notes | PMID:14552056 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 2640 | ||
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| Author | Singh,M.; Singh,M.; Sharma, A. K.; Krishna B. A. | ||||
| Title | Methodological considerations in measurement of dominance in primates | Type | Journal Article | ||
| Year | 2003 | Publication | CURRENT SCIENCE | Abbreviated Journal | CURRENT SCIENCE |
| Volume | 84 | Issue | 5 | Pages | 709-713 |
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| Abstract | The strength of dominance hierarchy in a group of animals needs to be quantitatively measured since it influences many other aspects of social interactions. This article discusses three attempts made by previous researchers to measure the strength of hierarchy. We propose a method which attempts to rectify the lacunae in the previous attempts. Data are used from a group of Japanese macaques housed in a colony. A method to calculate strength of hierarchy has been illustrated and a procedure has been suggested to normalize the dominance scores in order to place the ranks of individuals on an interval scale. |
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| Publisher | Biopsychology Laboratory, Department of Psychology, University of Mysore, Mysore 570 006, India | Place of Publication | Editor | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 2860 | ||
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| Author | Bolhuis, J.J. | ||||
| Title | Bird brains and behaviour: perception, cognition and production | Type | Journal Article | ||
| Year | 2003 | Publication | Animal Biology | Abbreviated Journal | |
| Volume | 53 | Issue | 2 | Pages | 71-72 |
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| Notes | formerly Netherlands Journal of Zoology | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 3104 | ||
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| Author | Kubinyi, E.; Miklósi, Á.; Topál, J.; Csányi, V. | ||||
| Title | Social mimetic behaviour and social anticipation in dogs: preliminary results | Type | Journal Article | ||
| Year | 2003 | Publication | Animal Cognition | Abbreviated Journal | Anim. Cogn. |
| Volume | 6 | Issue | 1 | Pages | 57-63 |
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| Abstract | Learning contributes to the development of mutual mimicry in group mates. The aim of our study was to investigate whether dogs would initiate walking a detour if they were repeatedly exposed to the detouring behaviour of their owner. Eight dog owners were asked to modify their usual way of approaching their home at the end of their daily walks, namely, to make a short detour before the entrance. Owners performed the detour at least 180 times, over a period of 3-6 months. During the first 30 detours (trials 1-30) all dogs followed the owner on the new route. Between trials 151 and 180, four dogs started to walk the detour before the owner displayed any intention to walk in that direction in 50-93% of the cases. Further observations that were carried out on one dog showed that the initialisation of the detours manifested sooner if a second familiar person started to walk the detours. Interestingly, the dog persisted in initialising detours long after the owners stopped detouring. We describe the observed phenomenon in the framework of social anticipation that manifests when an animal learns the proper sequence of an act performed by another animal, so that it can (1) predict the action in this sequence, and (2) as a result start either a similar or a complementary action as a response. These observations suggest that the dogs' social anticipation ability contributes to behavioural synchronisation and cooperative processes between dog and owner. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 3260 | ||
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| Author | Reader, S.M. | ||||
| Title | Innovation and social learning: individual variation and brain evolution | Type | Journal Article | ||
| Year | 2003 | Publication | Animal Biology (formerly Netherlands Journal of Zoology) | Abbreviated Journal | Anim. Biol. Leiden. |
| Volume | 53 | Issue | 2 | Pages | 147-158 |
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| Abstract | This paper reviews behavioural, neurological and cognitive correlates of innovation at the individual, population and species level, focusing on birds and primates. Innovation, new or modified learned behaviour not previously found in the population, is the first stage in many instances of cultural transmission and may play an important role in the lives of animals with generalist or opportunistic lifestyles. Within-species, innovation is associated with low neophobia, high neophilia, and with high social learning propensities. Indices of innovatory propensities can be calculated for taxonomic groups by counting the frequency of reports of innovation in published literature. These innovation rate data provide a useful comparative measure for studies of behavioural flexibility and cognition. Innovation rate is positively correlated with the relative size of association areas in the brain, namely the hyperstriatum ventrale and neostriatum in birds, and the neocortex and striatum in primates. Innovation rate is also positively correlated with the reported variety of tool use, as well as interspecific differences in learning. Current evidence thus suggests similar patterns of cognitive evolution in primates and birds. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 3395 | ||
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| Author | Bekoff,M; Allen, C; Burghardt, G. M. | ||||
| Title | The cognitive animal: Empirical and theoretical perspectives on animal cognition | Type | Journal Article | ||
| Year | 2003 | Publication | Computers and Mathematics with Applications | Abbreviated Journal | |
| Volume | 46 | Issue | Pages | 508-509 | |
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| Publisher | The MIT Press | Place of Publication | Cambridge, MA. | Editor | |
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| Call Number | refbase @ user @ | Serial | 3496 | ||
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| Author | Call, J. | ||||
| Title | Beyond learning fixed rules and social cues: abstraction in the social arena | Type | Journal Article | ||
| Year | 2003 | Publication | Philosophical Transactions of the Royal Society B: Biological Sciences | Abbreviated Journal | Phil. Trans. Biol. Sci. |
| Volume | 358 | Issue | 1435 | Pages | 1189-1196 |
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| Abstract | Abstraction is a central idea in many areas of physical comparative cognition such as categorization, numerical competence or problem solving. This idea, however, has rarely been applied to comparative social cognition. In this paper, I propose that the notion of abstraction can be applied to the social arena and become an important tool to investigate the social cognition and behaviour processes in animals. To make this point, I present recent evidence showing that chimpanzees know about what others can see and about what others intend. These data do not fit either low-level mechanisms based on stimulus-response associations or high-level explanations based on metarepresentational mechanisms such as false belief attribution. Instead, I argue that social abstraction, in particular the development of concepts such as seeing in others, is key to explaining the behaviour of our closest relative in a variety of situations. | ||||
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| Notes | Approved | no | |||
| Call Number | refbase @ user @ | Serial | 3524 | ||
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| Author | McCall, C.A.; Salters, M.A.; Johnson, K.B.; Silverman, S.J.; McElhenney, W.H.; Lishak, R.S. | ||||
| Title | Equine utilization of a previously learned visual stimulus to solve a novel task | Type | Journal Article | ||
| Year | 2003 | Publication | Applied Animal Behaviour Science | Abbreviated Journal | Appl. Anim. Behav. Sci. |
| Volume | 82 | Issue | 3 | Pages | 163-172 |
| Keywords | Horse; Learned stimulus; Novel task; Discrimination | ||||
| Abstract | Forty-four horses were used to determine if a learned stimulus could be used to increase acquisition of a response unrelated to the original learned task. Horses were paired by age, breed and sex. One randomly chosen horse from each pair served as the control while the remaining horse was trained to respond to a visual stimulus by pushing a lever to obtain a food reward. In Experiment I (n=28), the food reward was delivered in a feed box located equidistant between two levers located 2.7 m apart on one wall of the test stall. Trained horses were given 30 training trials daily until they achieved at least 85% correct responses in three nonconsecutive days. After each trained horse reached criterion, both horses in the pair were tested in 30 trials daily for five consecutive days in a modified Y maze. The stimulus that indicated the correct lever in the initial training task was used to signify the correct arm of the maze for both the control and trained horses. The correct arm of the maze was changed randomly during each daily session, and correct choices resulted in a food reward. In Experiment II (n=16), levers were located on opposite walls (11 m apart) of the test stall, and the stimulus and modified Y maze were simplified. Trained horses received 15 training trials daily until they reached at least 85% correct responses on three consecutive days. As each trained horse achieved this criterion, both horses in the pair were tested in a maze for 15 trials daily for 7 days. Again, the stimulus from initial lever-pressing task was used to signify the rewarded arm of the maze. Correct choices of trained and control horses in both experiments were compared using a paired t-test. In Experiment I, no differences (P>0.34) in mean correct responses were detected between trained and control horses on the first day in the maze (15.3 and 16.8, respectively) or after 5 days in the maze (84.0 and 82.1, respectively). Similarly, in Experiment II, trained and control horses did not differ (P>0.50) in mean correct responses on the first day (6.9 and 7.4, respectively) or after 7 days in the maze (63.6 and 61.6, respectively). These results indicate that the stimuli used to solve the lever-pressing task were not utilized by horses in the maze task, and that horses may have difficulty transferring learned visual stimuli to new tasks. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 3587 | ||
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| Author | Bachmann, I.; Bernasconi, P.; Herrmann, R.; Weishaupt, M.A.; Stauffacher, M. | ||||
| Title | Behavioural and physiological responses to an acute stressor in crib-biting and control horses | Type | Journal Article | ||
| Year | 2003 | Publication | Applied Animal Behaviour Science | Abbreviated Journal | Appl. Anim. Behav. Sci. |
| Volume | 82 | Issue | 4 | Pages | 297-311 |
| Keywords | Horse welfare; Stereotypies; Crib-biting; Pituitary-adrenocortical axis; Sympatho-adrenomedullar axis; Stress response; Stress sensibility | ||||
| Abstract | The responses of eleven pairs of crib-biting and non-crib-biting horses (controls) to an arousal-inducing stimulus were studied. Video-observation of the horses revealed that crib-biting horses spent between 10.4 and 64.7% of their stabling time performing the stereotypy. During the first 2 days of an experimental period, the horses were conditioned to receive food from a special bucket. On the third day the food bucket was presented, but the horses were not allowed to feed. Arousal behaviour and crib-biting intensity as well as plasma cortisol concentration, heart rate (HR) and heart rate variability (HRV) were recorded at rest, and during and after presentation of the food stimulus. The stimulus induced a significant increase of HR and arousal behaviour in crib-biters and in controls, whereas the crib-biting frequency decreased. Power spectral analysis of the HRV revealed significant differences between crib-biters and controls at rest: crib-biters had a lower vagal tone (high frequency component, HF) and a higher sympathetic tone (low frequency component, LF) than controls. The lower basal parasympathetic activity might be an indication why crib-biting horses, in contrast to the controls, showed neither a significant decrease of the HF component during presentation of the food stimulus nor an increase of the HF component after presentation. Thus, there might be differences in the tuning of the autonomous nervous system and of the stress reactivity in crib-biting and in control horses. The results suggest that the crib-biting horses are more stress sensitive and physiologically and psychologically less flexible than the control horses. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 3614 | ||
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