Limits...
Hemispheric specialization in dogs for processing different acoustic stimuli.

Siniscalchi M, Quaranta A, Rogers LJ - PLoS ONE (2008)

Bottom Line: The left hemisphere uses learned patterns and responds to familiar stimuli.Nevertheless, conspecific vocalizations are not always processed by the left hemisphere, since the right hemisphere is used for processing vocalizations when they elicit intense emotion, including fear.These findings suggest that the specialisation of the left hemisphere for intraspecific communication is more ancient that previously thought, and so is specialisation of the right hemisphere for intense emotions.

View Article: PubMed Central - PubMed

Affiliation: Department of Animal Production, University of Bari, Bari, Italy. m.siniscalchi@veterinaria.uniba.it

ABSTRACT
Considerable experimental evidence shows that functional cerebral asymmetries are widespread in animals. Activity of the right cerebral hemisphere has been associated with responses to novel stimuli and the expression of intense emotions, such as aggression, escape behaviour and fear. The left hemisphere uses learned patterns and responds to familiar stimuli. Although such lateralization has been studied mainly for visual responses, there is evidence in primates that auditory perception is lateralized and that vocal communication depends on differential processing by the hemispheres. The aim of the present work was to investigate whether dogs use different hemispheres to process different acoustic stimuli by presenting them with playbacks of a thunderstorm and their species-typical vocalizations. The results revealed that dogs usually process their species-typical vocalizations using the left hemisphere and the thunderstorm sounds using the right hemisphere. Nevertheless, conspecific vocalizations are not always processed by the left hemisphere, since the right hemisphere is used for processing vocalizations when they elicit intense emotion, including fear. These findings suggest that the specialisation of the left hemisphere for intraspecific communication is more ancient that previously thought, and so is specialisation of the right hemisphere for intense emotions.

Show MeSH

Related in: MedlinePlus

Laterality index (LI).LI for the head-orienting response of each dog to playbacks over the first 7 presentations: a score of 1.0 represents exclusive head turning to the left side and −1.0 exclusive head turning to the right side; * = P<0.01 (two-tailed t-tests).
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC2553184&req=5

pone-0003349-g003: Laterality index (LI).LI for the head-orienting response of each dog to playbacks over the first 7 presentations: a score of 1.0 represents exclusive head turning to the left side and −1.0 exclusive head turning to the right side; * = P<0.01 (two-tailed t-tests).

Mentions: Regarding the Laterality Index determined for the head-orienting response, a significant main effect of stimulus was observed (F(3,39) = 22.954, p = 0.000): post-hoc analysis (Fisher's Protected LSD) revealed that this main effect of stimulus was due to the response to the “thunderstorm” sounds being different from the responses to all other sounds (P<0.01 for all comparison between thunderstorm and the other stimuli), as can be seen from Figure 3. For Isolation and Disturbance call types, subjects consistently turned their head to the right side (Isolation call: t(13) = −3.172, P = 0.007; Disturbance call: t(13) = −3.238, P = 0.006, two-tailed t-tests) and, although there was a trend for the same side orienting bias for the Play call (t(13) = −2.048, P = 0.061, two-tailed t-tests), this was not significant. Nevertheless, as shown in Figure 3, dogs showed a comparable head orienting response for all three call types. In contrast, a significant head orienting response to the left side was found when dogs attended to playbacks of “thunderstorm” (t(13) = 6.505, P = 0.000, two-tailed t-tests).


Hemispheric specialization in dogs for processing different acoustic stimuli.

Siniscalchi M, Quaranta A, Rogers LJ - PLoS ONE (2008)

Laterality index (LI).LI for the head-orienting response of each dog to playbacks over the first 7 presentations: a score of 1.0 represents exclusive head turning to the left side and −1.0 exclusive head turning to the right side; * = P<0.01 (two-tailed t-tests).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2553184&req=5

pone-0003349-g003: Laterality index (LI).LI for the head-orienting response of each dog to playbacks over the first 7 presentations: a score of 1.0 represents exclusive head turning to the left side and −1.0 exclusive head turning to the right side; * = P<0.01 (two-tailed t-tests).
Mentions: Regarding the Laterality Index determined for the head-orienting response, a significant main effect of stimulus was observed (F(3,39) = 22.954, p = 0.000): post-hoc analysis (Fisher's Protected LSD) revealed that this main effect of stimulus was due to the response to the “thunderstorm” sounds being different from the responses to all other sounds (P<0.01 for all comparison between thunderstorm and the other stimuli), as can be seen from Figure 3. For Isolation and Disturbance call types, subjects consistently turned their head to the right side (Isolation call: t(13) = −3.172, P = 0.007; Disturbance call: t(13) = −3.238, P = 0.006, two-tailed t-tests) and, although there was a trend for the same side orienting bias for the Play call (t(13) = −2.048, P = 0.061, two-tailed t-tests), this was not significant. Nevertheless, as shown in Figure 3, dogs showed a comparable head orienting response for all three call types. In contrast, a significant head orienting response to the left side was found when dogs attended to playbacks of “thunderstorm” (t(13) = 6.505, P = 0.000, two-tailed t-tests).

Bottom Line: The left hemisphere uses learned patterns and responds to familiar stimuli.Nevertheless, conspecific vocalizations are not always processed by the left hemisphere, since the right hemisphere is used for processing vocalizations when they elicit intense emotion, including fear.These findings suggest that the specialisation of the left hemisphere for intraspecific communication is more ancient that previously thought, and so is specialisation of the right hemisphere for intense emotions.

View Article: PubMed Central - PubMed

Affiliation: Department of Animal Production, University of Bari, Bari, Italy. m.siniscalchi@veterinaria.uniba.it

ABSTRACT
Considerable experimental evidence shows that functional cerebral asymmetries are widespread in animals. Activity of the right cerebral hemisphere has been associated with responses to novel stimuli and the expression of intense emotions, such as aggression, escape behaviour and fear. The left hemisphere uses learned patterns and responds to familiar stimuli. Although such lateralization has been studied mainly for visual responses, there is evidence in primates that auditory perception is lateralized and that vocal communication depends on differential processing by the hemispheres. The aim of the present work was to investigate whether dogs use different hemispheres to process different acoustic stimuli by presenting them with playbacks of a thunderstorm and their species-typical vocalizations. The results revealed that dogs usually process their species-typical vocalizations using the left hemisphere and the thunderstorm sounds using the right hemisphere. Nevertheless, conspecific vocalizations are not always processed by the left hemisphere, since the right hemisphere is used for processing vocalizations when they elicit intense emotion, including fear. These findings suggest that the specialisation of the left hemisphere for intraspecific communication is more ancient that previously thought, and so is specialisation of the right hemisphere for intense emotions.

Show MeSH
Related in: MedlinePlus