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Author |
Austin, N.P.; Rogers, L.J. |
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Title |
Asymmetry of flight and escape turning responses in horses |
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Journal Article |
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Year |
2007 |
Publication |
Laterality |
Abbreviated Journal |
Laterality |
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Volume |
12 |
Issue |
5 |
Pages |
464-474 |
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Abstract |
We investigated whether horses display greater reactivity to a novel stimulus presented in the left compared to the right monocular visual field, and whether a population bias exists for escape turning when the same stimulus was presented binocularly. Domestic horses (N=30) were tested on three occasions by a person opening an umbrella five metres away and then approaching. The distance each horse moved away before stopping was measured. Distance was greatest for approach on the left side, indicating right hemisphere control of flight behaviour, and thus followed the same pattern found previously in other species. When order of monocular presentation was considered, an asymmetry was detected. Horses tested initially on the left side exhibited greater reactivity for left approach, whereas horses tested on the right side first displayed no side difference in reactivity. Perhaps left hemisphere inhibition of flight response allowed horses to learn that the stimulus posed no threat and this information was transferred to the right hemisphere. No population bias existed for the direction of escape turning, but horses that turned to the right when approached from the front were found to exhibit longer flight distances than those that turned to the left. |
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University of New England, Armidale, NSW, Australia |
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1357-650X |
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PMID:17712716 |
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Equine Behaviour @ team @ |
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4304 |
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Author |
Larose, C.; Richard-Yris, M.-A.; Hausberger, M.; Rogers, L.J. |
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Title |
Laterality of horses associated with emotionality in novel situations |
Type |
Journal Article |
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Year |
2006 |
Publication |
Laterality |
Abbreviated Journal |
Laterality |
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Volume |
11 |
Issue |
4 |
Pages |
355-367 |
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Keywords |
Affect/*physiology; Animals; Brain/*physiology; Female; Functional Laterality/*physiology; Horses; Male; *Social Behavior; *Social Environment |
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Abstract |
We have established that lateral biases are characteristic of visual behaviour in 65 horses. Two breeds, Trotters and French Saddlebreds aged 2 to 3, were tested on a novel object test. The main finding was a significant correlation between emotionality index and the eye preferred to view the novel stimulus: the higher the emotionality, the more likely that the horse looked with its left eye. The less emotive French Saddlebreds, however, tended to glance at the object using the right eye, a tendency that was not found in the Trotters, although the emotive index was the same for both breeds. The youngest French Saddlebreds did not show this trend. These results are discussed in relation to the different training practices for the breeds and broader findings on lateralisation in different species. |
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Universite de Rennes 1, France |
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1357-650X |
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PMID:16754236 |
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Call Number |
Equine Behaviour @ team @ room B 3.029 |
Serial |
1826 |
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Author |
Siniscalchi, M.; Quaranta, A.; Rogers, L.J. |
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Title |
Hemispheric specialization in dogs for processing different acoustic stimuli |
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Journal Article |
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Year |
2008 |
Publication |
PloS ONE |
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3 |
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Pages |
e3349 |
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Equine Behaviour @ team @ |
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5415 |
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Author |
Rogers, L.J. |
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Title |
Early Experiential Effects on Laterality: Research on Chicks has Relevance to Other Species |
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Journal Article |
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Year |
1997 |
Publication |
Laterality |
Abbreviated Journal |
Laterality |
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2 |
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3-4 |
Pages |
199-219 |
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Abstract |
The influence of early experience on the development of lateralisation of hemispheric function was further investigated, using the chick as a model. A range of functions are lateralised in the chick and these correlate with asymmetry in the organisation of the visual projections. Chicks using the right eye and, therefore, primarily the left hemisphere are able to switch from pecking randomly at grain and pebbles to pecking mainly at grain, whereas those using the left eye and primarily the right hemisphere continue to peck at random. Exposure to light during the last days of incubation establishes this lateralisation in males, as a consequence of the embryo being oriented in the egg so that the left eye only is occluded. Males incubated in the dark peck at random when using either the right or left eye. Irrespective of light experience, females perform the same as darkincubated males: they are not influenced by light exposure. Monocular performance of the pebble-grain task is compared to binocular performance, and the sensitive period for the influence of light is delineated. The interactive effects of sex hormone levels on the differentiation of lateralisation are discussed and also the relevance of the results to other species, including humans. |
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Psychology Press |
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1357-650x |
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doi: 10.1080/713754277 |
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Equine Behaviour @ team @ |
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5587 |
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Author |
Rogers, L.J. |
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Title |
Advantages and disadvantages of lateralization |
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Book Chapter |
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Year |
2002 |
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Abbreviated Journal |
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Pages |
126-153 |
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Cambridge University Press |
Place of Publication |
New York |
Editor |
L. J. Rogers,; R. Andrew, |
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ISBN |
9780521781619 |
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Call Number |
Equine Behaviour @ team @ L.J.Rogers+R.Andrew(eds)2002 |
Serial |
4624 |
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Author |
Rogers, L.J. |
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Title |
Evolution of Side Biases: Motor versus Sensory Lateralization |
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Book Chapter |
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Year |
2002 |
Publication |
Side Bias: A Neuropsychological Perspective |
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3-40-40 |
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Keywords |
Medicine & Public Health |
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Springer Netherlands |
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Mandal, M.K.; Bulman-Fleming, M.B.; Tiwari, G. |
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978-0-306-46884-1 |
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Equine Behaviour @ team @ |
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5357 |
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Author |
Rogers, L.J. |
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Title |
A Matter of Degree: Strength of Brain Asymmetry and Behaviour |
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Year |
2017 |
Publication |
Symmetry |
Abbreviated Journal |
Symmetry |
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Keywords |
functional asymmetry; strength of lateralization; direction of lateralization; advantages; disadvantages; vertebrate species; limb preference; eye bias |
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Abstract |
Research on a growing number of vertebrate species has shown that the left and right sides of the brain process information in different ways and that lateralized brain function is expressed in both specific and broad aspects of behaviour. This paper reviews the available evidence relating strength of lateralization to behavioural/cognitive performance. It begins by considering the relationship between limb preference and behaviour in humans and primates from the perspectives of direction and strength of lateralization. In birds, eye preference is used as a reflection of brain asymmetry and the strength of this asymmetry is associated with behaviour important for survival (e.g., visual discrimination of food from non-food and performance of two tasks in parallel). The same applies to studies on aquatic species, mainly fish but also tadpoles, in which strength of lateralization has been assessed as eye preferences or turning biases. Overall, the empirical evidence across vertebrate species points to the conclusion that stronger lateralization is advantageous in a wide range of contexts. Brief discussion of interhemispheric communication follows together with discussion of experiments that examined the effects of sectioning pathways connecting the left and right sides of the brain, or of preventing the development of these left-right connections. The conclusion reached is that degree of functional lateralization affects behaviour in quite similar ways across vertebrate species. Although the direction of lateralization is also important, in many situations strength of lateralization matters more. Finally, possible interactions between asymmetry in different sensory modalities is considered. |
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Symmetry |
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Series Volume |
9 |
Series Issue |
4 |
Edition |
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ISSN |
2073-8994 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
6167 |
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