<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Dunbar, R I M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Bridging the bonding gap: the transition from primates to humans.</style></title><secondary-title><style face="normal" font="default" size="100%">Philos Trans R Soc Lond B Biol Sci</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Philos. Trans. R. Soc. Lond., B, Biol. Sci.</style></alt-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Adaptation, Physiological</style></keyword><keyword><style  face="normal" font="default" size="100%">Animal communication</style></keyword><keyword><style  face="normal" font="default" size="100%">Animals</style></keyword><keyword><style  face="normal" font="default" size="100%">Biological Evolution</style></keyword><keyword><style  face="normal" font="default" size="100%">Ecology</style></keyword><keyword><style  face="normal" font="default" size="100%">Endorphins</style></keyword><keyword><style  face="normal" font="default" size="100%">Grooming</style></keyword><keyword><style  face="normal" font="default" size="100%">Humans</style></keyword><keyword><style  face="normal" font="default" size="100%">Laughter</style></keyword><keyword><style  face="normal" font="default" size="100%">Primates</style></keyword><keyword><style  face="normal" font="default" size="100%">Social Behavior</style></keyword><keyword><style  face="normal" font="default" size="100%">Social Environment</style></keyword><keyword><style  face="normal" font="default" size="100%">Time Factors</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">07/2012</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">367</style></volume><pages><style face="normal" font="default" size="100%">1837-46</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Primate societies are characterized by bonded social relationships of a kind that are rare in other mammal taxa. These bonded relationships, which provide the basis for coalitions, are underpinned by an endorphin mechanism mediated by social grooming. However, bonded relationships of this kind impose constraints on the size of social groups that are possible. When ecological pressures have demanded larger groups, primates have had to evolve new mechanisms to facilitate bonding. This has involved increasing the size of vocal and visual communication repertoires, increasing the time devoted to social interaction and developing a capacity to manage two-tier social relationships (strong and weak ties). I consider the implications of these constraints for the evolution of human social communities and argue that laughter was an early evolutionary innovation that helped bridge the bonding gap between the group sizes characteristic of chimpanzees and australopithecines and those in later hominins.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">1597</style></issue><custom1><style face="normal" font="default" size="100%">&lt;p&gt;http://www.ncbi.nlm.nih.gov/pubmed/22641822?dopt=Abstract&lt;/p&gt;
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