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Morton, F.B.; Lee, P.C.; Buchanan-Smith, H.M. |
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Title |
Taking personality selection bias seriously in animal cognition research: a case study in capuchin monkeys (Sapajus apella) |
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Journal Article |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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16 |
Issue |
4 |
Pages |
677-684 |
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Keywords |
Platyrrhines; Temperament; Cognitive experiment; Selection bias; Associative learning; Training |
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Abstract |
In most experimental work on animal cognition, researchers attempt to control for multiple interacting variables by training subjects prior to testing, allowing subjects to participate voluntarily, and providing subjects with food rewards. However, do such methods encourage selection bias from subjects’ personalities? In this study, we trained eighteen zoo-housed capuchin monkeys (Sapajus apella) for two experiments, under conditions of positive reinforcement (i.e. food rewards) and free-choice participation. Using a combination of behavioral and rater-based methods, we identified and validated five personality dimensions in these capuchins (Assertiveness, Openness, Neuroticism, Sociability, and Attentiveness). Scores on Openness were positively related to individual differences in monkey task participation, reflecting previous work showing that such individuals are often more active, curious, and willing to engage in testing. We also found a negative relationship between scores on Assertiveness and performance on tasks, which may reflect the trade-offs between speed and accuracy in these animals’ decision-making. Highly Assertive individuals (the most sociable within monkey groups) may also prioritize social interactions over engaging in research. Lastly, monkeys that consistently participated and performed well on both tasks showed significantly higher Openness and lower Assertiveness compared to others, mirroring relationships found between personality, participation, and performance among all participants. Participation and performance during training was clearly biased toward individuals with particular personalities (i.e. high Openness, low Assertiveness). Results are discussed in light of the need for careful interpretation of comparative data on animal cognition and the need for researchers to take personality selection bias more seriously.
Animal Cognition Animal Cognition Look
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Springer-Verlag |
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1435-9448 |
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Equine Behaviour @ team @ |
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5696 |
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Osthaus, B.; Proops, L.; Hocking, I.; Burden, F. |
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Title |
Spatial cognition and perseveration by horses, donkeys and mules in a simple A-not-B detour task |
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Journal Article |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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16 |
Issue |
2 |
Pages |
301-305 |
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Keywords |
Equids; Donkeys; Horses; Mules; Dogs; Detour; Spatial reasoning; A-not-B; Perseveration |
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Abstract |
We investigated perseveration and detour behaviour in 36 equids (Equus caballus, E. asinus, E. caballus × E. asinus) and compared these data to those of a previous study on domestic dogs (Canis familiaris). The animals were required to make a detour through a gap at one end of a straight barrier in order to reach a visible target. After one, two, three or four repeats (A trials), the gap was moved to the opposite end of the barrier (B trials). We recorded initial deviations from the correct solution path and the latency to crossing the barrier. In the A trials, mules crossed the barrier significantly faster than their parental species, the horses and donkeys. In the B trials, following the change of gap location, all species showed a reduction in performance. Both dogs and horses exhibited significant spatial perseveration, going initially to the previous gap location. Donkeys and mules, however, performed at chance level. Our results suggest that hybrid vigour in mules extends to spatial abilities. |
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Equine Behaviour @ team @ |
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5694 |
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Pelé, M.; Sueur, C. |
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Title |
Decision-making theories: linking the disparate research areas of individual and collective cognition |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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16 |
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4 |
Pages |
543-556 |
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Optimality; Primates; Insects; Diffusion Model; Delay; Risk; Speed-accuracy; Trade-off |
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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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1435-9448 |
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Equine Behaviour @ team @ |
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5692 |
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Author |
Péron, F.; Ward, R.; Burman, O. |
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Title |
Horses (Equus caballus) discriminate body odour cues from conspecifics |
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Journal Article |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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1-5 |
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Body odour; Discrimination; Equus caballus; Habituation; Social memory |
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Knowledge about social recognition and memory in animals can help us to determine appropriate management and husbandry techniques. In this study, we used a habituation–discrimination procedure to investigate the ability of horses (Equus caballus) to distinguish between the body odour samples of unfamiliar conspecifics. To pick up body odour, we rubbed material on the coat of horses and presented these unknown body odours to 16 different conspecifics of the same sex and similar age. The test consisted of two successive two-min presentations of a sample from one individual (e.g. individual ‘A’) and a simultaneous presentation of samples from individual ‘A’ and a novel individual (e.g. individual ‘B’) during a final third presentation. The results showed that horses, regardless of sex, decreased the time they spent investigating conspecific body odour across the initial two presentations—demonstrating habituation. In the final presentation, the results demonstrated successful discrimination of the previously experienced odour because horses investigated the novel olfactory sample (‘B’) significantly more than the pre-exposed sample (‘A’). Taken together, these findings suggest, for the first time, that horses are able to discriminate two stimuli derived from body odours of unfamiliar conspecifics over short period of time. |
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Springer Berlin Heidelberg |
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1435-9448 |
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Equine Behaviour @ team @ |
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5742 |
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Author |
Scheider, L.; Kaminski, J.; Call, J.; Tomasello, M. |
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Title |
Do domestic dogs interpret pointing as a command? |
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Journal Article |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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Volume |
16 |
Issue |
3 |
Pages |
361-372 |
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Keywords |
Communication; Domestic dog; Pointing; Comprehension; Imperative |
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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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1435-9448 |
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Equine Behaviour @ team @ |
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5666 |
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Author |
Valenchon, M.; Lévy, F.; Górecka-Bruzda, A.; Calandreau, L.; Lansade, L. |
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Title |
Characterization of long-term memory, resistance to extinction, and influence of temperament during two instrumental tasks in horses |
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Journal Article |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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Volume |
16 |
Issue |
6 |
Pages |
1001-1006 |
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Keywords |
Personality; Learning; Individuality; Fearfulness; Equid; Cognitive flexibility |
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The present study investigated the influence of temperament on long-term recall and extinction of 2 instrumental tasks in 26 horses. In the first task (backward task), horses learned to walk backward, using commands given by an experimenter, in order to obtain a food reward. In the second task (active avoidance task), horses had to cross an obstacle after a bell rang in order to avoid emission of an air puff. Twenty-two months after acquisition, horses exhibited perfect recall performance in both tasks. Accordingly, no influence of temperament on recall performance could be observed for either task. In contrast, in the absence of positive or negative outcomes, the horses’ ability to extinguish their response to either task was highly variable. Resistance to extinction was related to some indicators of temperament: The most fearful horses tended to be the most resistant to extinction in the backward task, while the least sensitive horses tended to be the most resistant to extinction in the active avoidance task. These findings reveal extensive long-term memory abilities in horses and suggest an influence of temperament on learning processes other than acquisition. |
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Springer Berlin Heidelberg |
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1435-9448 |
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Equine Behaviour @ team @ |
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5735 |
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