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Author |
Clayton, H.M. |
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Title |
Comparison of the stride kinematics of the collected, working, medium and extended trot in horses |
Type |
Journal Article |
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Year |
1994 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
Equine Vet J |
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Volume |
26 |
Issue |
3 |
Pages |
230-234 |
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Keywords |
Analysis of Variance; Animals; Biomechanics; Female; Forelimb/anatomy & histology/physiology; Gait/*physiology; Hindlimb/anatomy & histology/physiology; Horses/anatomy & histology/*physiology; Locomotion/physiology; Male; Motion Pictures |
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Abstract |
Highly-trained dressage horses were studied to test the hypothesis that stride length is altered independently of stride duration in the transitions between the collected, working, medium and extended trot. Six well-trained dressage horses were filmed at a frame rate of 150 frames/s performing the collected, working, medium and extended trots in a sand arena. Temporal, linear and angular data were extracted from the films, with 4 strides being analysed for each horse and gait type. There were no significant asymmetries between the left and rights limbs or diagonals when data from the whole group were pooled, but 3 horses showed asymmetries in one or more variables (P < 0.01). Analysis of variance and post-hoc tests indicated that the speed increased significantly (P < 0.01) from the collected (3.20 m/s) to the working (3.61 m/s) to the medium (4.47 m/s) to the extended (4.93 m/s) trot. The increases in speed were associated with a significant increase in stride length from 250 cm in the collected trot, to 273 cm in the working trot, 326 cm in the medium trot and 355 cm in the extended trot (P < 0.01). The lengthening of the stride was a result of increases between each gait type in the over-reach distance, whereas the diagonal distance was significantly longer in the extended than the collected trot only (P < 0.01). The stride duration tended to decrease as speed increased, and the difference became significant between the collected and extended trots (P < 0.01). |
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Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada |
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0425-1644 |
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PMID:8542844 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
3746 |
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Author |
Madigan, J.E.; Kortz, G.; Murphy, C.; Rodger, L. |
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Title |
Photic headshaking in the horse: 7 cases |
Type |
Journal Article |
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Year |
1995 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
Equine Vet J |
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Volume |
27 |
Issue |
4 |
Pages |
306-311 |
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Keywords |
Animals; Anti-Allergic Agents/therapeutic use; *Behavior, Animal; Cyproheptadine/therapeutic use; Female; *Head; Horse Diseases/drug therapy/*etiology; Horses; Light/*adverse effects; Male; Movement Disorders/drug therapy/etiology/*veterinary |
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Abstract |
Seven horses with headshaking are described. No physical abnormalities were detected in any of the cases. Six of these horses had onset of clinical signs in the spring. The role of light was assessed by application of a blindfold or dark grey lens to the eyes, covering the eyes with a face mask and observing the horse in total darkness outdoors. Cessation of headshaking was observed with blindfolding (5/5 horses), night darkness outdoors (4/4 horses) and use of grey lenses (2/3 horses). Outdoor behaviour suggested efforts to avoid light in 4/4 cases. The photic sneeze in man is suggested as a putative mechanism for equine headshaking. Five of 7 horses had improvement with cyproheptadine treatment (0.3 mg/kg bwt b.i.d.). Headshaking developed within 2 calendar weeks of the same date for 3 consecutive years in one horse. Neuropharmacological alterations associated with photoperiod mechanisms leading to optic trigeminal summation are suggested as possible reasons for spring onset of headshaking. |
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Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis 95616-8737, USA |
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0425-1644 |
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PMID:8536668 |
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Call Number |
refbase @ user @ |
Serial |
1940 |
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Author |
Holmstrom, M.; Fredricson, I.; Drevemo, S. |
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Title |
Biokinematic effects of collection on the trotting gaits in the elite dressage horse |
Type |
Journal Article |
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Year |
1995 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
Equine Vet J |
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Volume |
27 |
Issue |
4 |
Pages |
281-287 |
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Keywords |
Animals; Biomechanics; Female; Gait/*physiology; Horses/*physiology; Kinesics; Male; Video Recording |
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Abstract |
Trot in hand, working trot, collected trot, passage and piaffe of 6 Grand Prix dressage horses were recorded by high speed film (250 frames/s). Angular patterns and hoof trajectories of the left fore- and hindlimbs were analysed and presented as mean and standard deviation (s.d.) curves. Speed and stride length decreased and fore- and hind stance phase durations increased with collection resulting in no suspension in piaffe. The diagonal advanced placement was positive in all gaits except for piaffe. Most of the changes in forelimb angular patterns were effects of reduction in forelimb pendulation. The horses did not step under themselves more in collected trot, passage and piaffe than in trot in hand. The stifle and hock joints were more flexed at the start of the stance phase in piaffe and passage than in the other gaits. Flexion of the hock joint at the middle of the stance phase was largest in passage and piaffe. In spite of the limited number of horses the present study confirmed earlier observations of conformation and gaits in dressage horses. Hindlimb pendulation, femur and pelvis inclinations and elbow, carpal, stifle and hock joint angles seem to be the most significant angular measurements for dressage performance. |
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Swedish National Stud, Flyinge |
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English |
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0425-1644 |
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Notes |
PMID:8536664 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
3742 |
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Author |
Krebs, J.R.; Clayton, N.S.; Hampton, R.R.; Shettleworth, S.J. |
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Title |
Effects of photoperiod on food-storing and the hippocampus in birds |
Type |
Journal Article |
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Year |
1995 |
Publication |
Neuroreport |
Abbreviated Journal |
Neuroreport |
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Volume |
6 |
Issue |
12 |
Pages |
1701-1704 |
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Keywords |
Animals; Birds; Eating/*physiology; Female; Hippocampus/*physiology; Light; Male; *Photoperiod; Seasons; Telencephalon/physiology; Time Factors |
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Abstract |
Birds that store food have a relatively large hippocampus compared to non-storing species. The hippocampus shows seasonal differences in neurogenesis and volume in black-capped chikadees (Parus atricapillus) taken from the wild at different times of year. We compared hippocampal volumes in black-capped chickadees captured at the same time but differing in food-storing behaviour because of manipulations of photoperiod in the laboratory. Differences in food-storing behaviour were not accompanied by differences in the volume of the hippocampus. Hippocampal volumes also did not differ between two groups of a non-food-storing control species, house sparrows (Passer domesticus), exposed to the same conditions as the chickadees. |
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Edward Grey Institute of Field Ornithology, Department of Zoology, Oxford, UK |
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ISSN |
0959-4965 |
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Notes |
PMID:8527745 |
Approved |
no |
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Call Number |
refbase @ user @ |
Serial |
378 |
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Author |
Loveland, K.A. |
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Title |
Self-recognition in the bottlenose dolphin: ecological considerations |
Type |
Journal Article |
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Year |
1995 |
Publication |
Consciousness and Cognition |
Abbreviated Journal |
Conscious Cogn |
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Volume |
4 |
Issue |
2 |
Pages |
254-257 |
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Keywords |
Animals; Attention; *Awareness; Body Image; Dolphins/*psychology; Exploratory Behavior; Female; Male; *Self Concept; *Social Environment; Species Specificity; Television; *Visual Perception |
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Address |
Department of Psychiatry and Behavioral Sciences, University of Texas Medical School, Houston 77025, USA |
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ISSN |
1053-8100 |
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Notes |
PMID:8521267 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
4161 |
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Author |
Hart, D.; Whitlow, J.W.J. |
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Title |
The experience of self in the bottlenose dolphin |
Type |
Journal Article |
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Year |
1995 |
Publication |
Consciousness and Cognition |
Abbreviated Journal |
Conscious Cogn |
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Volume |
4 |
Issue |
2 |
Pages |
244-247 |
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Keywords |
Animal Communication; Animals; *Awareness; Body Image; Dolphins/*psychology; Female; Humans; Male; *Self Concept; Social Behavior; Species Specificity; *Television; *Visual Perception |
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Abstract |
Marten and Psarakos have presented some evidence which suggests that objective self-awareness and possibly representations of self may characterize the dolphins' experience of self. Their research demonstrates the possibility of similarities in the sense of self between primate species and dolphins, although whether dolphins have subjective self-awareness, personal memories, and theories of self--all important facets of the sense of self in humans--was not examined. Clearly, even this limited evidence was difficult to achieve; the difficulties in adapting methods and coding behavior are quite apparent in their report. Future progress, however, may depend upon clarification of what are the necessary components for a sense of self and an explication of how these might be reflected in dolphin behavior. We are mindful of the authors' point (pp. 219 and 220) that the dolphin lives more in an acoustic than a visual environment. Thus, while tasks relying upon vision may reveal the presence or absence of the sense of self in primates, it might well be the case that in dolphins self-related experiences might be better revealed in auditory tasks. But then, what is the nature of human self-awareness in terms of audition? While both conceptual and methodological hurdles remain, Marten and Psarakos have demonstrated that important questions can be asked about the minds and phenomenal worlds of nonanthropoid species. |
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Department of Psychology, Rutgers University, Camden, New Jersey 08102, USA |
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1053-8100 |
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Notes |
PMID:8521264 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
4162 |
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Author |
Anderson, J.R. |
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Title |
Self-recognition in dolphins: credible cetaceans; compromised criteria, controls, and conclusions |
Type |
Journal Article |
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Year |
1995 |
Publication |
Consciousness and Cognition |
Abbreviated Journal |
Conscious Cogn |
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Volume |
4 |
Issue |
2 |
Pages |
239-243 |
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Keywords |
Animal Communication; Animals; *Awareness; Discrimination Learning; Dolphins/*psychology; Female; Male; Orientation; *Self Concept; Social Behavior; *Television; *Visual Perception |
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Abstract |
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Address |
Laboratoire de Psychophysiologie, CNRS URA 1295, Universite Louis Pasteur, Strasbourg, France |
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1053-8100 |
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PMID:8521263 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
4163 |
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Author |
Marten, K.; Psarakos, S. |
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Title |
Using self-view television to distinguish between self-examination and social behavior in the bottlenose dolphin (Tursiops truncatus) |
Type |
Journal Article |
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Year |
1995 |
Publication |
Consciousness and Cognition |
Abbreviated Journal |
Conscious Cogn |
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Volume |
4 |
Issue |
2 |
Pages |
205-224 |
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Keywords |
Animal Communication; Animals; *Attention; Discrimination Learning; Dolphins/*psychology; Female; Male; *Self Concept; *Social Behavior; *Television; *Visual Perception |
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Abstract |
In mirror mark tests dolphins twist, posture, and engage in open-mouth and head movements, often repetitive. Because postures and an open mouth are also dolphin social behaviors, we used self-view television as a manipulatable mirror to distinguish between self-examination and social behavior. Two dolphins were exposed to alternating real-time self-view (“mirror mode”) and playback of the same to determine if they distinguished between them. The adult male engaged in elaborate open-mouth behaviors in mirror mode, but usually just watched when played back the same material. Mirror mode behavior was also compared to interacting with real dolphins (controls). Mark tests were conducted, as well as switches from front to side self-views to see if the dolphins turned. They presented marked areas to the self-view television and turned. The results suggest self-examination over social behavior. |
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Earthtrust, Kailua, Hawaii 96734, USA |
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1053-8100 |
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Notes |
PMID:8521259 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
4164 |
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Author |
McDonnell, S.M. |
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Title |
More on self-mutilative behavior in horses |
Type |
Journal Article |
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Year |
1993 |
Publication |
Journal of the American Veterinary Medical Association |
Abbreviated Journal |
J Am Vet Med Assoc |
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Volume |
202 |
Issue |
10 |
Pages |
1545-1546 |
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Keywords |
Animals; Female; Horses/*injuries/psychology; Male; *Self Mutilation |
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0003-1488 |
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PMID:8514553 |
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Call Number |
refbase @ user @ |
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1943 |
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Author |
Domjan, M. |
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Title |
Selective suppression of drinking during a limited period following aversive drug treatment in rats |
Type |
Journal Article |
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Year |
1977 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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Volume |
3 |
Issue |
1 |
Pages |
66-76 |
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Keywords |
Animals; *Avoidance Learning; Awareness; Conditioning, Operant; Dose-Response Relationship, Drug; Drinking Behavior/*drug effects; Lithium/*poisoning; Male; Osmolar Concentration; Rats; Saccharin/administration & dosage; *Taste; Time Factors |
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Abstract |
Administration of lithium chloride disrupted the intake of flavored solutions but not water in rats. This intake suppression was directly related to the amount of lithium administered (Experiment 1), occurred with both palatable and unpalatable novel saccharin solutions (Experiment 2), but was only observed if subjects were tested starting less than 75 min. after lithium treatment (Experiment 3). Twenty-five daily exposures to saccharin did not attenuate the effect (Experiment 4). However, in saccharin-reared and vinegar-reared rats, lithium did not disrupt consumption of the solutions these subjects had access to throughout life, even though suppressions of intake were observed when these subjects were tested with novel flavors (Experiment 5). The selective disruption of drinking is interpreted as a novelty-dependent sensitization reaction to the discomfort of aversive drug administration. |
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0097-7403 |
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PMID:845544 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2788 |
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