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Prather, J.F.; Peters, S.; Nowicki, S.; Mooney, R. |
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Title |
Precise auditory-vocal mirroring in neurons for learned vocal communication |
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Journal Article |
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2008 |
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Nature |
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Nature |
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451 |
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7176 |
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305-310 |
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Abstract |
Brain mechanisms for communication must establish a correspondence between sensory and motor codes used to represent
the signal. One idea is that this correspondence is established at the level of single neurons that are active when the
individual performs a particular gesture or observes a similar gesture performed by another individual. Although neurons
that display a precise auditory–vocal correspondence could facilitate vocal communication, they have yet to be identified.
Here we report that a certain class of neurons in the swamp sparrow forebrain displays a precise auditory–vocal
correspondence. We show that these neurons respond in a temporally precise fashion to auditory presentation of certain
note sequences in this songbird’s repertoire and to similar note sequences in other birds’ songs. These neurons display
nearly identical patterns of activity when the bird sings the same sequence, and disrupting auditory feedback does not alter
this singing-related activity, indicating it is motor in nature. Furthermore, these neurons innervate striatal structures
important for song learning, raising the possibility that singing-related activity in these cells is compared to auditory
feedback to guide vocal learning. |
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Nature Publishing Group |
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0028-0836 |
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10.1038/nature06492 |
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no |
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Equine Behaviour @ team @ |
Serial |
5062 |
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Author |
Nagy, M.; Akos, Z.; Biro, D.; Vicsek, T. |
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Title |
Hierarchical group dynamics in pigeon flocks |
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Journal Article |
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Year |
2010 |
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Nature |
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Nature |
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Volume |
464 |
Issue |
7290 |
Pages |
890-893 |
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Abstract |
Animals that travel together in groups display a variety of fascinating motion patterns thought to be the result of delicate local interactions among group members1, 2, 3. Although the most informative way of investigating and interpreting collective movement phenomena would be afforded by the collection of high-resolution spatiotemporal data from moving individuals, such data are scarce4, 5, 6, 7 and are virtually non-existent for long-distance group motion within a natural setting because of the associated technological difficulties8. Here we present results of experiments in which track logs of homing pigeons flying in flocks of up to 10 individuals have been obtained by high-resolution lightweight GPS devices and analysed using a variety of correlation functions inspired by approaches common in statistical physics. We find a well-defined hierarchy among flock members from data concerning leading roles in pairwise interactions, defined on the basis of characteristic delay times between birds’ directional choices. The average spatial position of a pigeon within the flock strongly correlates with its place in the hierarchy, and birds respond more quickly to conspecifics perceived primarily through the left eye—both results revealing differential roles for birds that assume different positions with respect to flock-mates. From an evolutionary perspective, our results suggest that hierarchical organization of group flight may be more efficient than an egalitarian one, at least for those flock sizes that permit regular pairwise interactions among group members, during which leader–follower relationships are consistently manifested. |
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Macmillan Publishers Limited. All rights reserved |
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0028-0836 |
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10.1038/nature08891 |
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Equine Behaviour @ team @ |
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5111 |
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Chittka, L.; Dyer, A. |
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Title |
Cognition: Your face looks familiar |
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Journal Article |
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2012 |
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Nature |
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Nature |
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481 |
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7380 |
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154-155 |
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Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. |
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0028-0836 |
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10.1038/481154a |
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Equine Behaviour @ team @ |
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5494 |
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Author |
Moon, C.; Baldridge, M.T.; Wallace, M.A.; Burnham, C.-A.D.; Virgin, H.W.; Stappenbeck, T.S. |
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Title |
Vertically transmitted faecal IgA levels determine extra-chromosomal phenotypic variation |
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Journal Article |
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2015 |
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Nature |
Abbreviated Journal |
Nature |
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Volume |
521 |
Issue |
7550 |
Pages |
90-93 |
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Phenotype |
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The proliferation of genetically modified mouse models has exposed phenotypic variation between investigators and institutions that has been challenging to control1-5. In many cases, the microbiota is the presumed culprit of the variation. Current solutions to account for phenotypic variability include littermate and maternal controls or defined microbial consortia in gnotobiotic mice6,7. In conventionally raised mice, the microbiome is transmitted from the dam2,8,9. Here we show that microbially–driven dichotomous fecal IgA levels in WT mice within the same facility mimic the effects of chromosomal mutations. We observed in multiple facilities that vertically-transmissible bacteria in IgA-Low mice dominantly lowered fecal IgA levels in IgA-High mice after cohousing or fecal transplantation. In response to injury, IgA-Low mice showed increased damage that was transferable by fecal transplantation and driven by fecal IgA differences. We found that bacteria from IgA-Low mice degraded the secretory component (SC) of SIgA as well as IgA itself. These data indicate that phenotypic comparisons between mice must take into account the non-chromosomal hereditary variation between different breeders. We propose fecal IgA as one marker of microbial variability and conclude that cohousing and/or fecal transplantation enables analysis of progeny from different dams. |
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Department of Pathology and Immunology, Washington University School of Medicine, St Louis, Missouri 63110, USA. |
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eng |
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no |
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Equine Behaviour @ team @ |
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6005 |
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Rizzolatti, G.; Fogassi, L.; Gallese, V. |
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Title |
Neurophysiological mechanisms underlying the understanding and imitation of action |
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Journal Article |
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Year |
2001 |
Publication |
Nature Reviews Neuroscience |
Abbreviated Journal |
Nat Rev Neurosci |
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Volume |
2 |
Issue |
9 |
Pages |
661-670 |
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Abstract |
What are the neural bases of action understanding? Although this capacity could merely involve visual analysis of the action, it has been argued that we actually map this visual information onto its motor representation in our nervous system. Here we discuss evidence for the existence of a system, the ‘mirror system’, that seems to serve this mapping function in primates and humans, and explore its implications for the understanding and imitation of action. |
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1471-003x |
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10.1038/35090060 |
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Equine Behaviour @ team @ |
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5013 |
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