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Smith, B.R.; Blumstein, D.T. |
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Title |
Fitness consequences of personality: a meta-analysis |
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Journal Article |
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2008 |
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Behavioral Ecology |
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Behav. Ecol. |
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19 |
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2 |
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448-455 |
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The study of nonhuman personality capitalizes on the fact that individuals of many species behave in predictable, variable, and quantifiable ways. Although a few empirical studies have examined the ultimate consequences of personality differences, there has been no synthesis of results. We conducted a formal meta-analysis of published studies reporting fitness consequences of single personality dimensions to identify general trends across species. We found bolder individuals had increased reproductive success, particularly in males, but incurred a survival cost, thus, supporting the hypothesis that variation in boldness was maintained due to a “trade-off” in fitness consequences across contexts. Potential mechanisms maintaining variation in exploration and aggression are not as clear. Exploration had a positive effect only on survival, whereas aggression had a positive effect on both reproductive success and, not significantly, on survival. Such results would suggest that selection is driving populations to become more explorative and aggressive. However, limitations in meta-analytic techniques preclude us from testing for the effects of fluctuating environmental conditions or other forms of selection on these dimensions. Results do, however, provide evidence for general relationships between personality and fitness, and we provide a framework for future studies to follow in the hopes of spurring more in-depth, long-term research into the evolutionary mechanisms maintaining variation in personality dimensions and overall behavioral syndromes. We conclude with a discussion on how understanding and managing personality traits may play a key role in the captive breeding and recovery programs of endangered species. |
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10.1093/beheco/arm144 |
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Equine Behaviour @ team @ |
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5226 |
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Bertram, J.E.A.; Gutmann, A. |
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Motions of the running horse and cheetah revisited: fundamental mechanics of the transverse and rotary gallop |
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2008 |
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Journal of The Royal Society Interface |
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Mammals use two distinct gallops referred to as the transverse (where landing and take-off are contralateral) and rotary (where landing and take-off are ipsilateral). These two gallops are used by a variety of mammals, but the transverse gallop is epitomized by the horse and the rotary gallop by the cheetah. In this paper, we argue that the fundamental difference between these gaits is determined by which set of limbs, fore or hind, initiates the transition of the centre of mass from a downward–forward to upward–forward trajectory that occurs between the main ballistic (non-contact) portions of the stride when the animal makes contact with the ground. The impulse-mediated directional transition is a key feature of locomotion on limbs and is one of the major sources of momentum and kinetic energy loss, and a main reason why active work must be added to maintain speed in locomotion. Our analysis shows that the equine gallop transition is initiated by a hindlimb contact and occurs in a manner in some ways analogous to the skipping of a stone on a water surface. By contrast, the cheetah gallop transition is initiated by a forelimb contact, and the mechanics appear to have much in common with the human bipedal run. Many mammals use both types of gallop, and the transition strategies that we describe form points on a continuum linked even to functionally symmetrical running gaits such as the tölt and amble. |
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10.1098/rsif.2008.0328 |
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Equine Behaviour @ team @ |
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4780 |
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Li, W.; Howard, J.D.; Parrish, T.B.; Gottfried, J.A. |
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Aversive Learning Enhances Perceptual and Cortical Discrimination of Indiscriminable Odor Cues |
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2008 |
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Science |
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Science |
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319 |
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5871 |
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1842-1845 |
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Learning to associate sensory cues with threats is critical for minimizing aversive experience. The ecological benefit of associative learning relies on accurate perception of predictive cues, but how aversive learning enhances perceptual acuity of sensory signals, particularly in humans, is unclear. We combined multivariate functional magnetic resonance imaging with olfactory psychophysics to show that initially indistinguishable odor enantiomers (mirror-image molecules) become discriminable after aversive conditioning, paralleling the spatial divergence of ensemble activity patterns in primary olfactory (piriform) cortex. Our findings indicate that aversive learning induces piriform plasticity with corresponding gains in odor enantiomer discrimination, underscoring the capacity of fear conditioning to update perceptual representation of predictive cues, over and above its well-recognized role in the acquisition of conditioned responses. That completely indiscriminable sensations can be transformed into discriminable percepts further accentuates the potency of associative learning to enhance sensory cue perception and support adaptive behavior. |
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10.1126/science.1152837 |
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Equine Behaviour @ team @ |
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4408 |
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Li, W.; Howard, J.D.; Parrish, T.B.; Gottfried, J.A. |
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Supporting Online Material to: Aversive Learning Enhances Perceptual and Cortical Discrimination of Indiscriminable Odor Cues |
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Miscellaneous |
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2008 |
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Science |
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Science |
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319 |
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5871 |
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1842-1845 |
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Learning to associate sensory cues with threats is critical for minimizing aversive experience. The ecological benefit of associative learning relies on accurate perception of predictive cues, but how aversive learning enhances perceptual acuity of sensory signals, particularly in humans, is unclear. We combined multivariate functional magnetic resonance imaging with olfactory psychophysics to show that initially indistinguishable odor enantiomers (mirror-image molecules) become discriminable after aversive conditioning, paralleling the spatial divergence of ensemble activity patterns in primary olfactory (piriform) cortex. Our findings indicate that aversive learning induces piriform plasticity with corresponding gains in odor enantiomer discrimination, underscoring the capacity of fear conditioning to update perceptual representation of predictive cues, over and above its well-recognized role in the acquisition of conditioned responses. That completely indiscriminable sensations can be transformed into discriminable percepts further accentuates the potency of associative learning to enhance sensory cue perception and support adaptive behavior. |
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10.1126/science.1152837 |
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Equine Behaviour @ team @ |
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4409 |
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Fabbri-Destro, M.; Rizzolatti, G. |
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Title |
Mirror Neurons and Mirror Systems in Monkeys and Humans |
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Journal Article |
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Year |
2008 |
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Physiology |
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Physiology |
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23 |
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3 |
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171-179 |
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Mirror neurons are a distinct class of neurons that transform specific sensory information into a motor format. Mirror neurons have been originally discovered in the premotor and parietal cortex of the monkey. Subsequent neurophysiological (TMS, EEG, MEG) and brain imaging studies have shown that a mirror mechanism is also present in humans. According to its anatomical locations, mirror mechanism plays a role in action and intention understanding, imitation, speech, and emotion feeling. |
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10.1152/physiol.00004.2008 |
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Equine Behaviour @ team @ |
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5014 |
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Schmied, C.; Boivin, X.; Waiblinger, S. |
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Stroking Different Body Regions of Dairy Cows: Effects on Avoidance and Approach Behavior Toward Humans |
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Journal Article |
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2008 |
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J. Dairy Sci. |
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91 |
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2 |
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596-605 |
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Understanding perception of dairy cows to common human contact such as stroking is important for improving the human-animal relationship, animal welfare, and production. We hypothesized that repeated stroking of body regions licked most during social grooming, especially the ventral neck, would reduce cows' avoidance of and increase their approach to humans. Sixty tethered dairy cows were randomly allocated to 4 treatment groups that received 5 min of daily human contact 5 d/wk during 3 consecutive weeks: 3 groups were stroked on different body regions. The first group was stroked on the ventral part of the neck (neck); the second group on the withers (both licked often in social grooming); the third group on the lateral side of the chest (chest, licked rarely); and the last group (control) was exposed to simple human presence. The reactions to the person who had provided the treatment were measured using 2 tests in the home tie-stall assessing avoidance from an approaching person who tried to touch the head (approaching person test) and avoidance/approach reactions to a stationary person (stationary person test). Approach behavior was recorded in a novel environment using a standard arena test. In the home tie-stall, cows stroked on the neck showed less avoidance (median avoidance score: 3.33) in the approaching person test compared with cows stroked on the chest and the controls (both: 4.00). That is, at least 75% of the animals stroked on the neck tolerated the touching of their heads (75th percentile [≤] 3.75), whereas at least 50% of the cows in the other treatment groups did not accept it. The stationary person test did not reveal any differences between the treatment groups. In the arena test, the 3 stroked groups showed more approach behavior (median latencies to contact: from 145 to 240 s) compared with simple human presence (300 s), but stroking treatments did not differ from each other. Stroking, particularly the neck, reduced avoidance of and increased approach reactions to humans in both the home tie-stall and the arena. Increasing acceptance of being touched after being stroked on the neck suggests that this procedure should be adopted to improve routine handling of dairy cattle. |
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10.3168/jds.2007-0360 |
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Equine Behaviour @ team @ |
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4551 |
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Warren-Smith, A.K.; McGreevy, P.D. |
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Preliminary investigations into the ethological relevance of round-pen (round-yard) training of horses |
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Journal Article |
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2008 |
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Journal of Applied Animal Welfare Science |
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11 |
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3 |
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285-298 |
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Recently, training horses within round-pens has increased in popularity. Practitioners often maintain that the responses they elicit from horses are similar to signals used with senior conspecifics. To audit the responses of horses to conspecifics, 6 mare-young-horse dyads, this study introduced them to each other in a round-pen and videoed them for 8 min. These dyads spent significantly more time farther than 10 m apart than they did less than 1 m apart (p < .001). The time they spent less than 1 m apart decreased over the 8-min test period (p = .018). Mares occupied the center of the round-pen and chased youngsters for 0.73% of the test period (p < .001). Mares made all agonistic approaches (p < .001), and youngsters (p = .018) made all investigative approaches. Head lowering and licking-and-chewing were exhibited most when the youngsters were facing away from the mares (p < .001). The frequency of head lowering increased during the test period (p = .027), whereas the frequency of licking-and-chewing did not change. The results bring into question the popular interpretation and ethological relevance of equine responses commonly described in round-pen training and show that mares did not condition young horses to remain in close proximity to them. |
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Faculty of Veterinary Science, University of Sydney, Sydney, NSW, Australia |
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Cited By (since 1996): 1; Export Date: 13 November 2008; Source: Scopus |
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Equine Behaviour @ team @ |
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4657 |
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Krapp, A.; Bachmann I.; Troxler, J. |
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Title |
Das Liegeverhalten von Pferden in Gruppenhaltung |
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Conference Article |
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2008 |
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Schweizer Archiv für Tierheilkunde |
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150 |
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4 |
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186-187 |
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Erarbeitung eines Lösungsansatzes zur Optimierung
des eingeschränkten Liegeverhaltens rangniedriger
Pferde in Gruppenhaltung |
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Das Liegeverhalten von Pferden in Gruppenhaltung 2008.pdf |
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Equine Behaviour @ team @ |
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5306 |
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Maros, K.; Dóka, A.; Miklósi, Á. |
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Behavioural correlation of heart rate changes in family dogs |
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2008 |
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Applied Animal Behaviour Science |
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Appl. Anim. Behav. Sci. |
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109 |
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2 |
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329-341 |
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Fourteen dogs (7 males and 7 females) were tested for their heart rate (HR) and heart rate variability (HRV) responses in different activities and environmental challenges while their movement was controlled. First, we wanted to compare the dogs? cardiac responses in different body positions (lying, sitting and standing) and during slow walking to reveal their possible influence on HR and HRV. Second, we tested the HR response during an attentive state when the dog was gazing at its favourite toy while remaining in a steady body position. Finally we investigated the heart activity during separation from the owner. We also analysed the individual differences and the influence of gender on the heart responses. We found that the HR increased during periods of increased activity (walking) and was lowest during lying, while it did not differ between sitting and standing. At the same time no changes in HRV were found in the case of different body positions and walking. In contrast, HRV significantly increased when dogs oriented towards their favourite toy, and we found a distinct individual characteristic HR change in this situation compared to the similar body position without the toy being shown. Interestingly during separation from the owner the HR did not increase, but when a strange person was petting the dog, a significant increasing effect was seen in the HR. However the HRV increased only when the petting was discontinued. In general, large individual variation was found with regard to the HR and HRV, while gender did not influence the cardiac activity of the dogs.These results show that body position affected HR significantly in dogs. Further it seems that HRV could be a good indicator of the dog's attentive state. Thus in future studies both the physical and cognitive factors should be given more attention when HR or HRV is investigated as a dependent variable. |
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Elsevier |
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doi: 10.1016/j.applanim.2007.03.005 |
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Equine Behaviour @ team @ |
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5846 |
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de Waal, F.B.M. |
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Putting the Altruism Back into Altruism: The Evolution of Empathy |
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2008 |
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Annual Review of Psychology |
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Annu Rev Psychol |
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59 |
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1 |
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279-300 |
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Evolutionary theory postulates that altruistic behavior evolved for the return-benefits it bears the performer. For return-benefits to play a motivational role, however, they need to be experienced by the organism. Motivational analyses should restrict themselves, therefore, to the altruistic impulse and its knowable consequences. Empathy is an ideal candidate mechanism to underlie so-called directed altruism, i.e., altruism in response to anothers's pain, need, or distress. Evidence is accumulating that this mechanism is phylogenetically ancient, probably as old as mammals and birds. Perception of the emotional state of another automatically activates shared representations causing a matching emotional state in the observer. With increasing cognition, state-matching evolved into more complex forms, including concern for the other and perspective-taking. Empathy-induced altruism derives its strength from the emotional stake it offers the self in the other's welfare. The dynamics of the empathy mechanism agree with predictions from kin selection and reciprocal altruism theory. |
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Annual Reviews |
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0066-4308 |
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doi: 10.1146/annurev.psych.59.103006.093625 |
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Equine Behaviour @ team @ |
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5058 |
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