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Author |
Ramsden, S.; Richardson, F.M.; Josse, G.; Thomas, M.S.C.; Ellis, C.; Shakeshaft, C.; Seghier, M.L.; Price, C.J. |
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Title |
Verbal and non-verbal intelligence changes in the teenage brain |
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Journal Article |
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Year |
2011 |
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Nature |
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advance online publication |
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Intelligence quotient (IQ) is a standardized measure of human intellectual capacity that takes into account a wide range of cognitive skills1. IQ is generally considered to be stable across the lifespan, with scores at one time point used to predict educational achievement and employment prospects in later years1. Neuroimaging allows us to test whether unexpected longitudinal fluctuations in measured IQ are related to brain development. Here we show that verbal and non-verbal IQ can rise or fall in the teenage years, with these changes in performance validated by their close correlation with changes in local brain structure. A combination of structural and functional imaging showed that verbal IQ changed with grey matter in a region that was activated by speech, whereas non-verbal IQ changed with grey matter in a region that was activated by finger movements. By using longitudinal assessments of the same individuals, we obviated the many sources of variation in brain structure that confound cross-sectional studies. This allowed us to dissociate neural markers for the two types of IQ and to show that general verbal and non-verbal abilities are closely linked to the sensorimotor skills involved in learning. More generally, our results emphasize the possibility that an individual’s intellectual capacity relative to their peers can decrease or increase in the teenage years. This would be encouraging to those whose intellectual potential may improve, and would be a warning that early achievers may not maintain their potential. |
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Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. |
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1476-4687 |
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10.1038/nature10514 |
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Equine Behaviour @ team @ |
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5422 |
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Author |
Potts, W.K.; Manning, C.J.; Wakeland, E.K. |
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Title |
Mating patterns in seminatural populations of mice influenced by MHC genotype |
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1991 |
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Nature |
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Nature |
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352 |
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6336 |
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619-621 |
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10.1038/352619a0 |
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Equine Behaviour @ team @ |
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5424 |
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Author |
Barton, N. |
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Title |
Evolutionary biology: The geometry of adaptation |
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Journal Article |
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1998 |
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Nature |
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Nature |
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395 |
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6704 |
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751-752 |
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0028-0836 |
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10.1038/27338 |
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Equine Behaviour @ team @ |
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5469 |
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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 |
Apicella, C.L.; Marlowe, F.W.; Fowler, J.H.; Christakis, N.A. |
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Title |
Social networks and cooperation in hunter-gatherers |
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Journal Article |
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2012 |
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Nature |
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481 |
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7382 |
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497-501 |
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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/nature10736 |
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Equine Behaviour @ team @ |
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5577 |
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Ferrero, D.M.; Moeller, L.M.; Osakada, T.; Horio, N.; Li, Q.; Roy, D.S.; Cichy, A.; Spehr, M.; Touhara, K.; Liberles, S.D. |
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Title |
A juvenile mouse pheromone inhibits sexual behaviour through the vomeronasal system |
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Journal Article |
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Year |
2013 |
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Nature |
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502 |
Issue |
7471 |
Pages |
368-371 |
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Pheromone Olfactory receptors |
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Abstract |
Animals display a repertoire of different social behaviours. Appropriate behavioural responses depend on sensory input received during social interactions. In mice, social behaviour is driven by pheromones, chemical signals that encode information related to age, sex and physiological state1. However, although mice show different social behaviours towards adults, juveniles and neonates, sensory cues that enable specific recognition of juvenile mice are unknown. Here we describe a juvenile pheromone produced by young mice before puberty, termed exocrine-gland secreting peptide 22 (ESP22). ESP22 is secreted from the lacrimal gland and released into tears of 2- to 3-week-old mice. Upon detection, ESP22 activates high-affinity sensory neurons in the vomeronasal organ, and downstream limbic neurons in the medial amygdala. Recombinant ESP22, painted on mice, exerts a powerful inhibitory effect on adult male mating behaviour, which is abolished in knockout mice lacking TRPC2, a key signalling component of the vomeronasal organ2, 3. Furthermore, knockout of TRPC2 or loss of ESP22 production results in increased sexual behaviour of adult males towards juveniles, and sexual responses towards ESP22-deficient juveniles are suppressed by ESP22 painting. Thus, we describe a pheromone of sexually immature mice that controls an innate social behaviour, a response pathway through the accessory olfactory system and a new role for vomeronasal organ signalling in inhibiting sexual behaviour towards young. These findings provide a molecular framework for understanding how a sensory system can regulate behaviour. |
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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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Equine Behaviour @ team @ |
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5732 |
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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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Abstract |
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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0028-0836 |
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Equine Behaviour @ team @ |
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6005 |
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Author |
Welsh Da, |
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Title |
The life of Sable Island's wild horses |
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Journal Article |
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1973 |
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Nature Canada |
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2 |
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7-14 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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1701 |
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