| Records |
| Author |
Schwarz, S.; Marr, I.; Farmer, K.; Graf, K.; Stefanski, V.; Krueger, K. |
| Title |
Does Carrying a Rider Change Motor and Sensory Laterality in Horses? |
Type |
Journal Article |
| Year |
2022 |
Publication |
Animals |
Abbreviated Journal |
Animals |
| Volume |
12 |
Issue |
8 |
Pages |
992 |
| Keywords |
laterality; horse; rider; sensory laterality; motor laterality; novel object; side preference |
| Abstract |
Laterality in horses has been studied in recent decades. Although most horses are kept for riding purposes, there has been almost no research on how laterality may be affected by carrying a rider. In this study, 23 horses were tested for lateral preferences, both with and without a rider, in three different experiments. The rider gave minimal aids and rode on a long rein to allow the horse free choice. Firstly, motor laterality was assessed by observing forelimb preference when stepping over a pole. Secondly, sensory laterality was assessed by observing perceptual side preferences when the horse was confronted with (a) an unfamiliar person or (b) a novel object. After applying a generalised linear model, this preliminary study found that a rider increased the strength of motor laterality (p = 0.01) but did not affect sensory laterality (p = 0.8). This suggests that carrying a rider who is as passive as possible does not have an adverse effect on a horse�s stress levels and mental state. |
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Equine Behaviour @ team @ |
Serial |
6667 |
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| Author |
Giljov, A.; Karenina, K. |
| Title |
Differential roles of the right and left brain hemispheres in the social interactions of a free-ranging ungulate |
Type |
Journal Article |
| Year |
2019 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
168 |
Issue |
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Pages |
103959 |
| Keywords |
Laterality; Hemispheric specialization; Brain asymmetry; Eye preference; Ungulate; Bovid |
| Abstract |
Despite the abundant empirical evidence on lateralized social behaviours, a clear understanding of the relative roles of two brain hemispheres in social processing is still lacking. This study investigated visual lateralization in social interactions of free-ranging European bison (Bison bonasus). The bison were more likely to display aggressive responses (such as fight and side hit), when they viewed the conspecific with the right visual field, implicating the left brain hemisphere. In contrast, the responses associated with positive social interactions (female-to-calf bonding, calf-to-female approach, suckling) or aggression inhibition (fight termination) occurred more likely when the left visual field was in use, indicating the right hemisphere advantage. The results do not support either assumptions of right-hemisphere dominance for control of various social functions or hypotheses about simple positive (approach) versus negative (withdrawal) distinction between the hemispheric roles. The discrepancy between the studies suggests that in animals, the relative roles of the hemispheres in social processing may be determined by a fine balance of emotions and motivations associated with the particular social reaction difficult to categorize for a human investigator. Our findings highlight the involvement of both brain hemispheres in the control of social behaviour. |
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0376-6357 |
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Equine Behaviour @ team @ |
Serial |
6587 |
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| Author |
Rogers, L.J. |
| Title |
A Matter of Degree: Strength of Brain Asymmetry and Behaviour |
Type |
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| Year |
2017 |
Publication |
Symmetry |
Abbreviated Journal |
Symmetry |
| Volume |
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Issue |
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Pages |
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| Keywords |
functional asymmetry; strength of lateralization; direction of lateralization; advantages; disadvantages; vertebrate species; limb preference; eye bias |
| 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 |
| Series Volume |
9 |
Series Issue |
4 |
Edition |
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2073-8994 |
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Equine Behaviour @ team @ |
Serial |
6167 |
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| Author |
Siniscalchi, M.; Padalino, B.; Lusito, R.; Quaranta, A. |
| Title |
Is the left forelimb preference indicative of a stressful situation in horses? |
Type |
Journal Article |
| Year |
2014 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
107 |
Issue |
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Pages |
61-67 |
| Keywords |
Animal welfare; Ethology; Horse; Limb preference; Physiology |
| Abstract |
Abstract Evidence for behavioural and brain lateralisation is now widespread among the animal kingdom; lateralisation of limb use (pawedness) occurs in several mammals including both feral and domestic horses. We investigated limb preferences in 14 Quarter Horse during different motor tasks (walking, stepping on and off a step, truck loading and unloading). Population lateralisation was observed in two tasks: horses preferentially used their left forelimb during truck loading and stepping off a step. The results also revealed that horses showed higher scores for anxious behaviours during truck loading suggesting that the use of the left forelimb in this task may reflect the main role of the right hemisphere in control of behaviour during stressful situation. |
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0376-6357 |
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Equine Behaviour @ team @ |
Serial |
6041 |
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| Author |
Méary, D.; Li, Z.; Li, W.; Guo, K.; Pascalis, O. |
| Title |
Seeing two faces together: preference formation in humans and rhesus macaques |
Type |
Journal Article |
| Year |
2014 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
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Issue |
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Pages |
1-13 |
| Keywords |
Humans; Rhesus macaques; Preferences; Faces; Eye-tracking |
| Abstract |
Humans, great apes and old world monkeys show selective attention to faces depending on conspecificity, familiarity, and social status supporting the view that primates share similar face processing mechanisms. Although many studies have been done on face scanning strategy in monkeys and humans, the mechanisms influencing viewing preference have received little attention. To determine how face categories influence viewing preference in humans and rhesus macaques (Macaca mulatta), we performed two eye-tracking experiments using a visual preference task whereby pairs of faces from different species were presented simultaneously. The results indicated that viewing time was significantly influenced by the pairing of the face categories. Humans showed a strong bias towards an own-race face in an Asian–Caucasian condition. Rhesus macaques directed more attention towards non-human primate faces when they were paired with human faces, regardless of the species. When rhesus faces were paired with faces from Barbary macaques (Macaca sylvanus) or chimpanzees (Pan troglodytes), the novel species’ faces attracted more attention. These results indicate that monkeys’ viewing preferences, as assessed by a visual preference task, are modulated by several factors, species and dominance being the most influential. |
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Springer Berlin Heidelberg |
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English |
Summary Language |
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1435-9448 |
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no |
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Equine Behaviour @ team @ |
Serial |
5790 |
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| Author |
Siniscalchi, M.; Sasso, R.; Pepe, A.M.; Dimatteo, S.; Vallortigara, G.; Quaranta, A. |
| Title |
Catecholamine plasma levels following immune stimulation with rabies vaccine in dogs selected for their paw preferences |
Type |
Journal Article |
| Year |
2010 |
Publication |
Neuroscience Letters |
Abbreviated Journal |
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| Volume |
476 |
Issue |
3 |
Pages |
142-145 |
| Keywords |
Physiology; Behavior; Lateralization; Catecholamines; Paw preference; Neuro-immune-modulation |
| Abstract |
Epinephrine and norepinephrine plasma levels were assessed in dogs in relation to paw preference following an immune challenge with rabies vaccine. The results showed that both catecholamines increased after the vaccine administration, confirming the main role of the sympathetic nervous system in the modulation activity between the brain and the immune system. Moreover, ambidextrous dogs showed a significantly higher increase of epinephrine levels 8 days after immunization with respect to right- and left-pawed dogs, suggesting that the biological activity of this molecule could be key for a different immune response with regard to laterality. |
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0304-3940 |
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no |
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Equine Behaviour @ team @ |
Serial |
5788 |
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| Author |
Quaranta, A.; Siniscalchi, M.; Frate, A.; Vallortigara, G. |
| Title |
Paw preference in dogs: relations between lateralised behaviour and immunity |
Type |
Journal Article |
| Year |
2004 |
Publication |
Behavioural Brain Research |
Abbreviated Journal |
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| Volume |
153 |
Issue |
2 |
Pages |
521-525 |
| Keywords |
Paw preference; Lateralisation; Immunity; Dog |
| Abstract |
Paw use in a task consisting of the removal of a piece of adhesive paper from the snout was investigated in 80 mongrel and pure-bred domestic dogs (Canis familiaris). Population lateralisation was observed, but in opposite directions in the two sexes (animals were not desexed): males preferentially used their left paw, females their right paw. The relationship between immune function and paw preference was then investigated. Some immune parameters (total number of white blood cells including lymphocytes, granulocytes and monocytes; leukocyte formula; total proteins; γ-globulins) were investigated in a sample of left-pawed (n=6), right-pawed (n=6) and ambidextrous (n=6) dogs. The results showed that the percentage of lymphocytes was higher in left-pawed than in right-pawed and ambidextrous dogs, whereas granulocytes percentage was lower in left-pawed than in right-pawed and ambidextrous dogs. Moreover, total number of lymphocytes cells was higher in left-pawed than in right-pawed and ambidextrous dogs, whereas the number of γ-globulins was lower in left-pawed than in right-pawed and ambidextrous dogs. These findings represent the first evidence that brain asymmetry modulates immune responses in dogs. |
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Edition |
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0166-4328 |
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no |
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Equine Behaviour @ team @ |
Serial |
5783 |
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| Author |
Austin, N.P.; Rogers, L.J. |
| Title |
Lateralization of agonistic and vigilance responses in Przewalski horses (Equus przewalskii) |
Type |
Journal Article |
| Year |
2014 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
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| Volume |
151 |
Issue |
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Pages |
43-50 |
| Keywords |
Behavioural lateralization: Eye preference; Limb preference; Aggression; Vigilance; Reactivity; Przewalski horses |
| Abstract |
tEye and limb preferences were scored in the closest undomesticated relative of Equuscaballus using the same methods as used previously to study laterality in feral horses.Observations were made of 33 Przewalski horses (Equus ferus przewalskii) (male N = 20,female N = 13) living under natural social conditions on a large reserve in France. Signifi-cant left-eye/side biases were found in agonistic interactions within harem bands (M ± SEbias to left 58% ± 0.01 for threats, P < 0.001; 68% ± 0.05 for attacks; P < 0.001) and in stallionfights (threats, 52% ± 0.01 left, P < 0.001; attacks, 63% ± 0.02 left, P < 0.001): as many as 80%of the horses were significantly lateralized in attack responses within harem bands. Lat-erality of vigilance was measured as lifting up the head from grazing and turning it to theleft or right side: a directional bias to the left was found (M ± SE 53% ± 0.02 left, P < 0.001).Side bias in reactivity was calculated as the percent of head lifts above the level of thewithers on the left or right side and this was also left side biased (M ± SE 73% ± 0.03 left,P < 0.001). These results indicate right-hemisphere specialization for control of aggressionand responses to novelty. The left bias in attack scores within harem bands was strongerin males than females (P = 0.024) and in immature than adult horses (P = 0.032). Immaturehorses were also more strongly lateralized than adults in vigilance scores (P = 0.022), whichmay suggest that experience reduces these side biases. Our results show that Przewalskihorses exhibit left eye preferences, as do feral horses, and do so even more strongly thanferal horses. Considering feral and Przewalski horses together, we deduce that ancestralhorses had similar lateral biases. Also similar to feral horses, the Przewalski horses showedno significant forelimb preference at the group level or in the majority of horses at theindividual level, confirming the hypothesis that previously reported limb preferences indomestic breeds are entrained or generated by breed-specific selection. |
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0168-1591 |
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no |
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Equine Behaviour @ team @ |
Serial |
5768 |
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| Author |
Cochet, H.; Byrne, R.W. |
| Title |
Evolutionary origins of human handedness: evaluating contrasting hypotheses |
Type |
Journal Article |
| Year |
2013 |
Publication |
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Abbreviated Journal |
Animal Cognition |
| Volume |
16 |
Issue |
4 |
Pages |
531-542 |
| Keywords |
Hand preference; Hemispheric specialization; Communicative gestures; Evolution of language; Nonhuman primates; Human children |
| Abstract |
Variation in methods and measures, resulting in past dispute over the existence of population handedness in nonhuman great apes, has impeded progress into the origins of human right-handedness and how it relates to the human hallmark of language. Pooling evidence from behavioral studies, neuroimaging and neuroanatomy, we evaluate data on manual and cerebral laterality in humans and other apes engaged in a range of manipulative tasks and in gestural communication. A simplistic human/animal partition is no longer tenable, and we review four (nonexclusive) possible drivers for the origin of population-level right-handedness: skilled manipulative activity, as in tool use; communicative gestures; organizational complexity of action, in particular hierarchical structure; and the role of intentionality in goal-directed action. Fully testing these hypotheses will require developmental and evolutionary evidence as well as modern neuroimaging data. |
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Springer-Verlag |
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English |
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1435-9448 |
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no |
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Equine Behaviour @ team @ |
Serial |
5691 |
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Austin, N.P.; Rogers, L.J. |
| Title |
Limb preferences and lateralization of aggression, reactivity and vigilance in feral horses, Equus caballus |
Type |
Journal Article |
| Year |
2012 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
| Volume |
83 |
Issue |
1 |
Pages |
239-247 |
| Keywords |
aggression; behavioural asymmetry; Equus caballus; eye preference; feral horse; limb preference; reactivity; side bias |
| Abstract |
Observational field studies were conducted on two remote populations of feral horses in Australia to determine whether lateralization is a characteristic of Equus caballus as a species or results from handling by humans. Group 1 had been feral for two to five generations and Group 2 for 10–20 generations. In both groups, left-side biases were present during agonistic interactions and in reactivity and vigilance. Therefore, as in other vertebrates, the right hemisphere appears to be specialized to control agonistic behaviour and responses to potential threats. The leftwards bias was stronger in measures of behaviour involving more aggression and reactivity. Preferences to place one forelimb in front of the other during grazing were also determined. No population bias of forelimb preference was found, suggesting that such limb preferences present in domestic horses may be entrained. Since stronger individual limb preferences were found in immature than in adult feral horses, limb preference may be modified by maturation or experience in the natural habitat. Stronger limb preference was associated significantly with elevated attention to the environment but only in younger feral horses. No sex differences in lateralization were found. The findings are evidence that horses show visual lateralization, as in other vertebrates, not dependent on handling by humans. Limb preference during grazing, by contrast, does appear to depend on experience. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5651 |
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