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Author |
Siegel, J.M. |
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Title |
Do all animals sleep? |
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Journal Article |
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Year |
2008 |
Publication |
Trends in Neurosciences |
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31 |
Issue |
4 |
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208-213 |
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Abstract |
Some animals never exhibit a state that meets the behavioral definition of sleep. Others suspend or greatly reduce ‘sleep’ behavior for many weeks during the postpartum period or during seasonal migrations without any consequent ‘sleep debt.’ Rats die from one form of sleep deprivation, but sleep loss has not been shown to cause death in well-controlled studies in other vertebrate species. Some marine mammal species do not show evidence for REM sleep, and convincing evidence for this state in reptiles, fish and insects is lacking. The enormous variation in the nature of rest and sleep states across the animal kingdom and within the mammalian class has important implications for understanding the evolution and functions of sleep. |
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0166-2236 |
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Equine Behaviour @ team @ |
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5613 |
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Author |
Geutjens, C.A.; Clayton, H.M.; Kaiser, L.J. |
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Title |
Forces and pressures beneath the saddle during mounting from the ground and from a raised mounting platform |
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Journal Article |
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Year |
2008 |
Publication |
The Veterinary Journal |
Abbreviated Journal |
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Volume |
175 |
Issue |
3 |
Pages |
332-337 |
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Electronic saddle mat; Total force; Peak pressure; Equestrian; Kinetics |
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Abstract |
The objective was to use an electronic pressure mat to measure and compare forces and pressures of the saddle on a horse's back when riders mounted from the ground and with the aid of a mounting platform. Ten riders mounted a horse three times each from the ground and from a 35 cm high mounting platform in random order. Total force (summation of forces over all 256 sensors) was measured and compared at specific points on the force-time curve. Total force was usually highest as the rider's right leg was swinging upwards and was correlated with rider mass. When normalized to rider mass, total force and peak pressure were significantly higher when mounting from the ground than from a raised platform (P < 0.05). The area of highest pressure was on the right side of the withers in 97% of mounting efforts, confirming the importance of the withers in stabilizing the saddle during mounting. |
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Admin @ knut @ |
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4344 |
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Author |
Singer, E.R.; Barnes, J.; Saxby, F.; Murray, J.K. |
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Title |
Injuries in the event horse: Training versus competition |
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Journal Article |
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Year |
2008 |
Publication |
The Veterinary Journal |
Abbreviated Journal |
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Volume |
175 |
Issue |
1 |
Pages |
76-81 |
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Event horse; Superficial digital flexor tendonitis; Suspensory ligament desmitis; Exertional rhabdomyolysis |
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Two related studies on injuries sustained by event horses during competition and during training are reported. During the cross-country phase of competition, the most common injuries were lacerations and abrasions to the carpus and stifle. Superficial digital flexor tendonitis and exertional rhabdomyolysis were significantly more common during Cours Complete Internationale (CCI) competitions compared to one-day event (ODE) competitions. The difference in injury types at ODEs and CCI competitions probably relates to the increased athletic demands of the CCI and the closer veterinary observation at these competitions. The results of the training study indicate that 21% of horses intending to compete in a CCI did not start due to injury. Forty-three percent of these injuries involved soft tissue structures with injuries to the superficial digital flexor tendon and the suspensory ligament each accounting for 33%. The most important area for future research is investigation of the risk factors for these career-threatening soft tissue injuries. |
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Admin @ knut @ |
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4352 |
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Author |
Weishaupt, M.A. |
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Title |
Adaptation strategies of horses with lameness |
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Journal Article |
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Year |
2008 |
Publication |
The Veterinary Clinics of North America. Equine Practice |
Abbreviated Journal |
Vet Clin North Am Equine Pract |
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24 |
Issue |
1 |
Pages |
79-100 |
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The skill to diagnose lameness in horses is paramount for every equine practitioner. Early recognition of locomotor deficiencies plays a central role in sports medicine management, preventing deterioration of the disease or catastrophic injuries. Horses use characteristic compensatory movements of specific body parts to decrease loading of the affected limb. This article describes the underlying changes in intra- and interlimb coordination and the resulting load redistribution between the limbs. This enables the practitioner to better understand the changes in movement associated with lameness. |
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Equine Department, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, CH-8057 Zurich, Switzerland. mweishaupt@vetclinics.uzh.ch |
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1558-4224 |
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PMID:18314037 |
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Equine Behaviour @ team @ |
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4372 |
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Author |
O'Grady, S.E. |
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Title |
Basic farriery for the performance horse |
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Journal Article |
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Year |
2008 |
Publication |
The Veterinary Clinics of North America. Equine Practice |
Abbreviated Journal |
Vet Clin North Am Equine Pract |
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24 |
Issue |
1 |
Pages |
203-218 |
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Proper farriery promotes a healthy functional foot and biomechanical efficiency and prevents lameness. Because the equine veterinarian is responsible for the soundness of the horse, a working knowledge of farriery becomes essential. A thorough knowledge of traditional horseshoeing enables the veterinarian to interact with the farrier at the farrier's level; this ultimately enhances and promotes quality hoof care. This article focuses on fundamental farriery and recognizing subtle changes in hoof conformation that can be used to preserve the integrity of the hoof capsule, along with the structures enclosed within, and thus prevent lameness in the performance horse. |
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Northern Virginia Equine, 8170 Patrickswell Lane, Marshall, VA 20115, USA. sogrady@look.net |
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1558-4224 |
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PMID:18314044 |
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Equine Behaviour @ team @ |
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4373 |
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Scheiber, I. B.R.; WeiB, B. M.; Hirschenhauser, K.; Wascher, C. A.F.; Nedelcu, J.T.; Kotrschal, K. |
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Title |
Does 'Relationship Intelligence' Make Big Brains in Birds? |
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Journal Article |
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Year |
2008 |
Publication |
The Open Biology Journal |
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Open Biol J |
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1 |
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6-8 (3) |
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Lately, Emery et al. developed a bird-specific modification of the *social brain hypothesis*, termed *relationship intelligence hypothesis*. Although the idea may be valuable, we doubt that it is supported by sufficient evidence and critically discuss some of the arguments raised by the authors in favour of their new idea. |
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AKonrad Lorenz Forschungsstelle fur Ethologie, Fischerau 11, 4645 Gruenau im Almtal, Austria. |
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Equine Behaviour @ team @ |
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4504 |
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Dugnol, B.; Fernández, C.; Galiano, G.; Velasco, J. |
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On a chirplet transform-based method applied to separating and counting wolf howls |
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Journal Article |
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Year |
2008 |
Publication |
Signal Process |
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88 |
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Equine Behaviour @ team @ Dugnol2008 |
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6466 |
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Author |
Li, W.; Howard, J.D.; Parrish, T.B.; Gottfried, J.A. |
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Title |
Aversive Learning Enhances Perceptual and Cortical Discrimination of Indiscriminable Odor Cues |
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Journal Article |
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Year |
2008 |
Publication |
Science |
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Science |
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319 |
Issue |
5871 |
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1842-1845 |
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Abstract |
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 |
Abbreviated Journal |
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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Author |
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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Year |
2008 |
Publication |
Schweizer Archiv für Tierheilkunde |
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Volume |
150 |
Issue |
4 |
Pages |
186-187 |
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Abstract |
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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