(2501) Resolution limit in community detection.   Fortunato S and Barthélemy M.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 36-41.

(2502) Differential fitness costs of reproduction between the sexes.   Penn DJ and Smith KR.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 553-558.

(2503) Identification of a population of sleep-active cerebral cortex neurons.   Gerashchenko D, Wisor JP, Burns D, Reh RK, Shiromani PJ, Sakurai T, de la Iglesia HO and Kilduff TS.   2008.   Proceedings of the National Academy of Sciences of the United States of America, volume 105, pages 10227-10232.

(2504) Multiple circuits relaying primate parallel visual pathways to the middle temporal area.   Nassi JJ and Callaway EM.   2006.   Journal of Neuroscience, volume 26, pages 12789-12798.

(2505) Testosterone is associated with mating success but not attractiveness or masculinity in human males.   Peters M, Simmons LW and Rhodes G.   2008.   Animal Behaviour, volume 76, pages 297-303.

(2506) Triadic postconflict affiliation in captive chimpanzees: does consolation console?   Koski SE and Sterck EHM.   2007.   Animal Behaviour, volume 73, pages 133-142.

(2507) Vocal premotor activity in the superior colliculus.   Sinha SR and Moss CF.   2007.   Journal of Neuroscience, volume 27, pages 98-110.

(2508) PET and MRI show differences in cerebral asymmetry and functional connectivity between homo- and heterosexual subjects.   Savic I and Lindström P.   2008.   Proceedings of the National Academy of Sciences of the United States of America, volume 105, pages 9403-9408.   With reference to the causal analysis, a study at one point in time does not enable the authors to discount a process such as learning that takes place over time.

(2509) The natural order of events: how speakers of different languages represent events nonverbally.   Goldin-Meadow S, So WC, Ozyürek A and Mylander C.   2008.   Proceedings of the National Academy of Sciences of the United States of America, volume 105, pages 9163-9168.

(2510) Uncoupling of behavioral and autonomic responses after lesions of the primate orbitofrontal cortex.   Reekie YL, Braesicke K, Man MS and Roberts AC.   2008.   Proceedings of the National Academy of Sciences of the United States of America, volume 105, pages 9787-9792.