| Records |
| Author |
Milo, R.; Itzkovitz, S.; Kashtan, N.; Levitt, R.; Alon, U. |
| Title |
Response to Comment on “Network Motifs: Simple Building Blocks of Complex Networks” and “Superfamilies of Evolved and Designed Networks” |
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Journal Article |
| Year |
2004 |
Publication  |
Science |
Abbreviated Journal |
Science |
| Volume |
305 |
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5687 |
Pages |
1107d |
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10.1126/science.1100519 |
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Equine Behaviour @ team @ |
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5031 |
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| Author |
Milo, R.; Shen-Orr, S.; Itzkovitz, S.; Kashtan, N.; Chklovskii, D.; Alon, U. |
| Title |
Network Motifs: Simple Building Blocks of Complex Networks |
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Journal Article |
| Year |
2002 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
298 |
Issue |
5594 |
Pages |
824-827 |
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Complex networks are studied across many fields of science. To uncover their structural design principles, we defined “network motifs,” patterns of interconnections occurring in complex networks at numbers that are significantly higher than those in randomized networks. We found such motifs in networks from biochemistry, neurobiology, ecology, and engineering. The motifs shared by ecological food webs were distinct from the motifs shared by the genetic networks of Escherichia coli and Saccharomyces cerevisiae or from those found in the World Wide Web. Similar motifs were found in networks that perform information processing, even though they describe elements as different as biomolecules within a cell and synaptic connections between neurons in Caenorhabditis elegans. Motifs may thus define universal classes of networks. This approach may uncover the basic building blocks of most networks. |
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10.1126/science.298.5594.824 |
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Equine Behaviour @ team @ |
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5032 |
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Milo, R.; Itzkovitz, S.; Kashtan, N.; Levitt, R.; Shen-Orr, S.; Ayzenshtat, I.; Sheffer, M.; Alon, U. |
| Title |
Superfamilies of Evolved and Designed Networks |
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Journal Article |
| Year |
2004 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
303 |
Issue |
5663 |
Pages |
1538-1542 |
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Complex biological, technological, and sociological networks can be of very different sizes and connectivities, making it difficult to compare their structures. Here we present an approach to systematically study similarity in the local structure of networks, based on the significance profile (SP) of small subgraphs in the network compared to randomized networks. We find several superfamilies of previously unrelated networks with very similar SPs. One superfamily, including transcription networks of microorganisms, represents “rate-limited” information-processing networks strongly constrained by the response time of their components. A distinct superfamily includes protein signaling, developmental genetic networks, and neuronal wiring. Additional superfamilies include power grids, protein-structure networks and geometric networks, World Wide Web links and social networks, and word-adjacency networks from different languages. |
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10.1126/science.1089167 |
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Equine Behaviour @ team @ |
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5033 |
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Artzy-Randrup, Y.; Fleishman, S.J.; Ben-Tal, N.; Stone, L. |
| Title |
Comment on “Network Motifs: Simple Building Blocks of Complex Networks” and “Superfamilies of Evolved and Designed Networks” |
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Journal Article |
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2004 |
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Science |
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Science |
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305 |
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5687 |
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1107c |
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10.1126/science.1099334 |
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Equine Behaviour @ team @ |
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5037 |
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Silk, J.B.; Alberts, S.C.; Altmann, J. |
| Title |
Social Bonds of Female Baboons Enhance Infant Survival |
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Journal Article |
| Year |
2003 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
302 |
Issue |
5648 |
Pages |
1231-1234 |
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Among nonhuman primates, females often form strong bonds with kin and other group members. These relationships are thought to have adaptive value for females, but direct effects of sociality on fitness have never been demonstrated. We present 16 years of behavioral data from a well-studied population of wild baboons, which demonstrate that sociality of adult females is positively associated with infant survival, an important component of variation in female lifetime fitness. The effects of sociality on infant survival are independent of the effects of dominance rank, group membership, and environmental conditions. Our results are consistent with the evidence that social support has beneficial effects on human health and well-being across the life span. For humans and other primates, sociality has adaptive value. |
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10.1126/science.1088580 |
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Equine Behaviour @ team @ |
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5151 |
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| Author |
Schmidt, M.; Lipson, H. |
| Title |
Distilling Free-Form Natural Laws from Experimental Data |
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Journal Article |
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2009 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
324 |
Issue |
5923 |
Pages |
81-85 |
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For centuries, scientists have attempted to identify and document analytical laws that underlie physical phenomena in nature. Despite the prevalence of computing power, the process of finding natural laws and their corresponding equations has resisted automation. A key challenge to finding analytic relations automatically is defining algorithmically what makes a correlation in observed data important and insightful. We propose a principle for the identification of nontriviality. We demonstrated this approach by automatically searching motion-tracking data captured from various physical systems, ranging from simple harmonic oscillators to chaotic double-pendula. Without any prior knowledge about physics, kinematics, or geometry, the algorithm discovered Hamiltonians, Lagrangians, and other laws of geometric and momentum conservation. The discovery rate accelerated as laws found for simpler systems were used to bootstrap explanations for more complex systems, gradually uncovering the “alphabet” used to describe those systems. |
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10.1126/science.1165893 |
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no |
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Equine Behaviour @ team @ |
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5264 |
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| Author |
Hamilton, C.R.; Vermeire, B.A. |
| Title |
Complementary hemispheric specialization in monkeys |
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Journal Article |
| Year |
1988 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
242 |
Issue |
4886 |
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1691-1694 |
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Twenty-five split-brain monkeys were taught to discriminate two types of visual stimuli that engage lateralized cerebral processing in human subjects. Differential lateralization for the two kinds of discriminations was found; the left hemisphere was better at distinguishing between tilted lines and the right hemisphere was better at discriminating faces. These results indicate that lateralization of cognitive processing appeared in primates independently of language or handedness. In addition, cerebral lateralization in monkeys may provide an appropriate model for studying the biological basis of hemispheric specialization. |
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no |
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Equine Behaviour @ team @ |
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5342 |
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| Author |
Warneken, F.; Tomasello, M. |
| Title |
Altruistic Helping in Human Infants and Young Chimpanzees |
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Journal Article |
| Year |
2006 |
Publication |
Science |
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311 |
Issue |
5765 |
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1301-1303 |
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Human beings routinely help others to achieve their goals, even when the helper receives no immediate benefit and the person helped is a stranger. Such altruistic behaviors (toward non-kin) are extremely rare evolutionarily, with some theorists even proposing that they are uniquely human. Here we show that human children as young as 18 months of age (prelinguistic or just-linguistic) quite readily help others to achieve their goals in a variety of different situations. This requires both an understanding of others' goals and an altruistic motivation to help. In addition, we demonstrate similar though less robust skills and motivations in three young chimpanzees. |
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no |
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Equine Behaviour @ team @ |
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5607 |
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Goodson, J.L.; Schrock, S.E.; Klatt, J.D.; Kabelik, D.; Kingsbury, M.A. |
| Title |
Mesotocin and Nonapeptide Receptors Promote Estrildid Flocking Behavior |
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Journal Article |
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2009 |
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Science |
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325 |
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5942 |
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862-866 |
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Proximate neural mechanisms that influence preferences for groups of a given size are almost wholly unknown. In the highly gregarious zebra finch (Estrildidae: Taeniopygia guttata), blockade of nonapeptide receptors by an oxytocin (OT) antagonist significantly reduced time spent with large groups and familiar social partners independent of time spent in social contact. Opposing effects were produced by central infusions of mesotocin (MT, avian homolog of OT). Most drug effects appeared to be female-specific. Across five estrildid finch species, species-typical group size correlates with nonapeptide receptor distributions in the lateral septum, and sociality in female zebra finches was reduced by OT antagonist infusions into the septum but not a control area. We propose that titration of sociality by MT represents a phylogenetically deep framework for the evolution of OT’s female-specific roles in pair bonding and maternal functions. |
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10.1126/science.1174929 |
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no |
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Equine Behaviour @ team @ |
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5646 |
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Gesquiere, L.R.; Learn, N.H.; Simao, M.C.M.; Onyango, P.O.; Alberts, S.C.; Altmann, J. |
| Title |
Life at the Top: Rank and Stress in Wild Male Baboons |
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Journal Article |
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2011 |
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Science |
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333 |
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6040 |
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357-360 |
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In social hierarchies, dominant individuals experience reproductive and health benefits, but the costs of social dominance remain a topic of debate. Prevailing hypotheses predict that higher-ranking males experience higher testosterone and glucocorticoid (stress hormone) levels than lower-ranking males when hierarchies are unstable but not otherwise. In this long-term study of rank-related stress in a natural population of savannah baboons (Papio cynocephalus), high-ranking males had higher testosterone and lower glucocorticoid levels than other males, regardless of hierarchy stability. The singular exception was for the highest-ranking (alpha) males, who exhibited both high testosterone and high glucocorticoid levels. In particular, alpha males exhibited much higher stress hormone levels than second-ranking (beta) males, suggesting that being at the very top may be more costly than previously thought. |
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10.1126/science.1207120 |
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Equine Behaviour @ team @ |
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5655 |
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