| Records |
| Author |
Scheider, L.; Kaminski, J.; Call, J.; Tomasello, M. |
| Title |
Do domestic dogs interpret pointing as a command? |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
3 |
Pages |
361-372 |
| Keywords |
Communication; Domestic dog; Pointing; Comprehension; Imperative |
| Abstract |
Domestic dogs comprehend human gestural communication flexibly, particularly the pointing gesture. Here, we examine whether dogs interpret pointing informatively, that is, as simply providing information, or rather as a command, for example, ordering them to move to a particular location. In the first study a human pointed toward an empty cup. In one manipulation, the dog either knew or did not know that the designated cup was empty (and that the other cup actually contained the food). In another manipulation, the human (as authority) either did or did not remain in the room after pointing. Dogs ignored the human’s gesture if they had better information, irrespective of the authority’s presence. In the second study, we varied the level of authority of the person pointing. Sometimes this person was an adult, and sometimes a young child. Dogs followed children’s pointing just as frequently as they followed adults’ pointing (and ignored the dishonest pointing of both), suggesting that the level of authority did not affect their behavior. Taken together these studies suggest that dogs do not see pointing as an imperative command ordering them to a particular location. It is still not totally clear, however, if they interpret it as informative or in some other way. |
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Springer-Verlag |
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English |
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1435-9448 |
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Equine Behaviour @ team @ |
Serial |
5666 |
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| Author |
Horn, L.; Range, F.; Huber, L. |
| Title |
Dogs’ attention towards humans depends on their relationship, not only on social familiarity |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
3 |
Pages |
435-443 |
| Keywords |
Domestic dogs; Social attention; Social familiarity; Dog–human relationship |
| Abstract |
Both in humans and non-human animals, it has been shown that individuals attend more to those they have previously interacted with and/or they are more closely associated with than to unfamiliar individuals. Whether this preference is mediated by mere social familiarity based on exposure or by the specific relationship between the two individuals, however, remains unclear. The domestic dog is an interesting subject in this line of research as it lives in the human environment and regularly interacts with numerous humans, yet it often has a particularly close relationship with its owner. Therefore, we investigated how long dogs (Canis familiaris) would attend to the actions of two familiar humans and one unfamiliar experimenter, while varying whether dogs had a close relationship with only one or both familiar humans. Our data provide evidence that social familiarity by itself cannot account for dogs’ increased attention towards their owners since they only attended more to those familiar humans with whom they also had a close relationship. |
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Springer-Verlag |
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English |
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1435-9448 |
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no |
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Equine Behaviour @ team @ |
Serial |
5667 |
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| Author |
Greco, B.J.; Brown, T.K.; Andrews, J.R.M.; Swaisgood, R.R.; Caine, N.G. |
| Title |
Social learning in captive African elephants (Loxodonta africana africana) |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
3 |
Pages |
459-469 |
| Keywords |
Elephants; Loxodonta; Social learning; Imitation; Animal cognition |
| Abstract |
Social learning is a more efficient method of information acquisition and application than trial and error learning and is prevalent across a variety of animal taxa. Social learning is assumed to be important for elephants, but evidence in support of that claim is mostly anecdotal. Using a herd of six adult female African bush elephants (Loxodonta africana africana) at the San Diego Zoo’s Safari Park, we evaluated whether viewing a conspecific’s interactions facilitated learning of a novel task. The tasks used feeding apparatus that could be solved in one of two distinct ways. Contrary to our hypothesis, the method the demonstrating animal used did not predict the method used by the observer. However, we did find evidence of social learning: After watching the model, subjects spent a greater percentage of their time interacting with the apparatus than they did in unmodeled trials. These results suggest that the demonstrations of a model may increase the motivation of elephants to explore novel foraging tasks. |
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Springer-Verlag |
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English |
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1435-9448 |
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no |
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Equine Behaviour @ team @ |
Serial |
5668 |
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| Author |
Kaminski, J.; Pitsch, A.; Tomasello, M. |
| Title |
Dogs steal in the dark |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
3 |
Pages |
385-394 |
| Keywords |
Domestic dog; Social cognition; Perspective taking; Competition |
| Abstract |
All current evidence of visual perspective taking in dogs can possibly be explained by dogs reacting to certain stimuli rather than understanding what others see. In the current study, we set up a situation in which contextual information and social cues are in conflict. A human always forbade the dog from taking a piece of food. The part of the room being illuminated was then varied, for example, either the area where the human was seated or the area where the food was located was lit. Results show that dogs steal significantly more food when it is dark compared to when it is light. While stealing forbidden food the dog’s behaviour also depends on the type of illumination in the room. Illumination around the food, but not the human, affected the dogs’ behaviour. This indicates that dogs do not take the sight of the human as a signal to avoid the food. It also cannot be explained by a low-level associative rule of avoiding illuminated food which dogs actually approach faster when they are in private. The current finding therefore raises the possibility that dogs take into account the human’s visual access to the food while making their decision to steal it. |
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Springer-Verlag |
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English |
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1435-9448 |
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no |
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Equine Behaviour @ team @ |
Serial |
5669 |
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| Author |
Clucas, B.; Marzluff, J.M.; Mackovjak, D.; Palmquist, I. |
| Title |
Do American Crows Pay Attention to Human Gaze and Facial Expressions? |
Type |
Journal Article |
| Year |
2013 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
119 |
Issue |
4 |
Pages |
296-302 |
| Keywords |
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| Abstract |
Interactions between species can lead to the evolution of interspecific communication. Non-verbal communication by humans, both intentional and unintentional, can be interpreted by other species. We tested whether American crows (Corvus brachyrhynchos) were sensitive to human facial features under field conditions by comparing flight initiation distances and urgency of escape behavior to human approaches varying in eye contact and facial expression. We first examined whether crows distinguish between an approaching human who is directly gazing at them and a human approaching them with an averted gaze. In a second experiment, we tested whether crows differentiate a smiling from scowling human approaching them with direct or averted gaze. In the first experiment, we found that crows fled sooner and more urgently when humans were directly gazing at them. Similarly, in the second experiment, crows responded sooner to a direct vs. averted gaze; however, they did not react differently to varying human facial expressions. We suggest that crows use human gaze as a reliable visual cue compared with facial expressions when making decisions about responding to approaching humans. This is the first study to show that a wild corvid species changes its behavior based on human gaze, possibly representing an adaptation to living in human-dominated urban areas and suggesting crows might perceive human intention by this visual cue. |
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| ISSN |
1439-0310 |
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no |
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Equine Behaviour @ team @ |
Serial |
5670 |
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| Author |
Proops, L.; Rayner, J.; Taylor, A.M.; McComb, K. |
| Title |
The Responses of Young Domestic Horses to Human-Given Cues |
Type |
Journal Article |
| Year |
2013 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
| Volume |
8 |
Issue |
6 |
Pages |
e67000 EP - |
| Keywords |
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| Abstract |
<p>It has been suggested that the process of domestication, at least in some species, has led to an innate predisposition to be skilled at reading human communicative and attentional cues. Adult domestic horses (<italic>Equus caballus</italic>) are highly sensitive to subtle bodily cues when determining if a person is attending to them but they are less adept at using human communicative cues in object choice tasks. Here we provide the first study into the ontogeny of such skills in order to gain insights into the mechanisms underlying these abilities. Compared with adult horses, youngsters under the age of three could use body orientation but not more subtle cues such as head movement and open/closed eyes to correctly choose an attentive person to approach for food. Across two object choice experiments, the performance of young horses was comparable to that of adult horses – subjects were able to correctly choose a rewarded bucket using marker placement, pointing and touching cues but could not use body orientation, gaze, elbow pointing or tapping cues. Taken together these results do not support the theory that horses possess an innate predisposition to be particularly skilled at using human cues. Horses' ability to determine whether humans are attending to them using subtle body cues appears to require significant experience to fully develop and their perhaps less remarkable use of limited cues in object choice tasks, although present at a much earlier age, is likely to reflect a more general learning ability related to stimulus enhancement rather than a specific ‘human-reading’ skill.</p> |
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Public Library of Science |
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no |
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Equine Behaviour @ team @ |
Serial |
5676 |
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| Author |
Begall, S.; Malkemper, E.P.; Cervený, J.; Nemec, P.; Burda, H. |
| Title |
Magnetic alignment in mammals and other animals |
Type |
Journal Article |
| Year |
2013 |
Publication |
Mammalian Biology – Zeitschrift für Säugetierkunde |
Abbreviated Journal |
Mamm. Biol. |
| Volume |
78 |
Issue |
1 |
Pages |
10-20 |
| Keywords |
Cattle; Deer; Fox; Horse; Magnetoreception |
| Abstract |
Magnetic alignment (MA) constitutes the simplest directional response to the geomagnetic field. In contrast to magnetic compass orientation, MA is not goal directed and represents a spontaneous, fixed directional response. Because animals tend to align their bodies along or perpendicular to the magnetic field lines, MA typically leads to bimodal or quadrimodal orientation, although there is also growing evidence for a fixed unimodal orientation not necessarily coinciding with the magnetic cardinal directions. MA has been demonstrated in diverse animals including insects, amphibians, fish, and mammals. Alignment can be expressed by animals during resting as well as on the move (e.g. while grazing, hunting, feeding, etc.). Here, we briefly survey characteristic features and classical examples of MA and review the current knowledge about the occurrence of MA in mammals. In addition, we summarize what is known about mechanisms underlying MA and discuss its prospective biological functions. Finally, we highlight some physiological effects of alignment along the magnetic field axes reported in humans. We argue that the phenomenon of MA adds a new paradigm that can be exploited for investigation of magnetoreception in mammals. |
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| ISSN |
1616-5047 |
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no |
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Equine Behaviour @ team @ |
Serial |
5678 |
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| Author |
Larsson, M. |
| Title |
The optic chiasm: a turning point in the evolution of eye/hand coordination |
Type |
Journal Article |
| Year |
2013 |
Publication |
Frontiers in Zoology |
Abbreviated Journal |
Front. Zool. |
| Volume |
10 |
Issue |
1 |
Pages |
41 |
| Keywords |
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| Abstract |
The primate visual system has a uniquely high proportion of ipsilateral retinal projections, retinal ganglial cells that do not cross the midline in the optic chiasm. The general assumption is that this developed due to the selective advantage of accurate depth perception through stereopsis. Here, the hypothesis that the need for accurate eye-forelimb coordination substantially influenced the evolution of the primate visual system is presented. Evolutionary processes may change the direction of retinal ganglial cells. Crossing, or non-crossing, in the optic chiasm determines which hemisphere receives visual feedback in reaching tasks. Each hemisphere receives little tactile and proprioceptive information about the ipsilateral hand. The eye-forelimb hypothesis proposes that abundant ipsilateral retinal projections developed in the primate brain to synthesize, in a single hemisphere, visual, tactile, proprioceptive, and motor information about a given hand, and that this improved eye-hand coordination and optimized the size of the brain. If accurate eye-hand coordination was a major factor in the evolution of stereopsis, stereopsis is likely to be highly developed for activity in the area where the hands most often operate.The primate visual system is ideally suited for tasks within arm's length and in the inferior visual field, where most manual activity takes place. Altering of ocular dominance in reaching tasks, reduced cross-modal cuing effects when arms are crossed, response of neurons in the primary motor cortex to viewed actions of a hand, multimodal neuron response to tactile as well as visual events, and extensive use of multimodal sensory information in reaching maneuvers support the premise that benefits of accurate limb control influenced the evolution of the primate visual system. The eye-forelimb hypothesis implies that evolutionary change toward hemidecussation in the optic chiasm provided parsimonious neural pathways in animals developing frontal vision and visually guided forelimbs, and also suggests a new perspective on vision convergence in prey and predatory animals. |
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1742-9994 |
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Equine Behaviour @ team @ |
Serial |
5685 |
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| Author |
Cochet, H.; Byrne, R.W. |
| Title |
Evolutionary origins of human handedness: evaluating contrasting hypotheses |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
4 |
Pages |
531-542 |
| Keywords |
Hand preference; Hemispheric specialization; Communicative gestures; Evolution of language; Nonhuman primates; Human children |
| Abstract |
Variation in methods and measures, resulting in past dispute over the existence of population handedness in nonhuman great apes, has impeded progress into the origins of human right-handedness and how it relates to the human hallmark of language. Pooling evidence from behavioral studies, neuroimaging and neuroanatomy, we evaluate data on manual and cerebral laterality in humans and other apes engaged in a range of manipulative tasks and in gestural communication. A simplistic human/animal partition is no longer tenable, and we review four (nonexclusive) possible drivers for the origin of population-level right-handedness: skilled manipulative activity, as in tool use; communicative gestures; organizational complexity of action, in particular hierarchical structure; and the role of intentionality in goal-directed action. Fully testing these hypotheses will require developmental and evolutionary evidence as well as modern neuroimaging data. |
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Springer-Verlag |
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English |
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1435-9448 |
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Equine Behaviour @ team @ |
Serial |
5691 |
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| Author |
Pelé, M.; Sueur, C. |
| Title |
Decision-making theories: linking the disparate research areas of individual and collective cognition |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
4 |
Pages |
543-556 |
| Keywords |
Optimality; Primates; Insects; Diffusion Model; Delay; Risk; Speed-accuracy; Trade-off |
| Abstract |
In order to maximize their fitness, animals have to deal with different environmental and social factors that affect their everyday life. Although the way an animal behaves might enhance its fitness or survival in regard to one factor, it could compromise them regarding another. In the domain of decision sciences, research concerning decision making focuses on performances at the individual level but also at the collective one. However, between individual and collective decision making, different terms are used resulting in little or no connection between both research areas. In this paper, we reviewed how different branches of decision sciences study the same concept, mainly called speed-accuracy trade-off, and how the different results are on the same track in terms of showing the optimality of decisions. Whatever the level, individual or collective, each decision might be defined with three parameters: time or delay to decide, risk and accuracy. We strongly believe that more progress would be possible in this domain of research if these different branches were better linked, with an exchange of their results and theories. A growing amount of literature describes economics in humans and eco-ethology in birds making compromises between starvation, predation and reproduction. Numerous studies have been carried out on social cognition in primates but also birds and carnivores, and other publications describe market or reciprocal exchanges of commodities. We therefore hope that this paper will lead these different areas to a common decision science. |
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Springer-Verlag |
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English |
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1435-9448 |
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Equine Behaviour @ team @ |
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5692 |
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