(2181) Spectral statistics in natural scenes predict hue, saturation, and brightness.   Long F, Yang Z and Purves D.   2006.   Proceedings of the National Academy of Sciences of the United States of America, volume 103, pages 6013-6018.

(2182) Serotonergic and nonseotonergic neurons in the dorsal raphe nucleus send collateralized projections to both the vestibular nuclei and the central amygdaloid nucleus.   Halberstadt AL and Balaban CD.   2006.   Neuroscience, volume 140, pages 1067-1077.

(2183) Dissociable roles of the posterior parietal and the prefrontal cortex in manipulation and monitoring processes.   Champod AS and Petrides M.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 14837-14842.

(2184) Color contrast processing in human striate cortex.   Kentridge RW, Heywood CA and Weiskrantz L.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 15129-15131.

(2185) The faculty of language: what is it, who has it, and how did it evolve?   Hauser MD, Chomsky N and Fitch WT.   2002.   Science, volume 298, pages 1569-1579.

(2186) Sex in the morning or in the evening? Females adjust daily mating patterns to the intensity of sexual harassment.   Løvlie H and Pizzari T.   2007.   The American Naturalist, volume 170, E1-13.

(2187) Nonhuman primate event-related potentials indexing covert shifts of attention.   Woodman GF, Kang MS, Rossi AF and Schall JD.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 15111-15116.

(2188) Resting-state networks in the infant brain.   Fransson P, Skiöld B, Horsch S, Nordell A, Blennow M, Lagercrantz H and Aden U.   2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 15531-15536.

(2189) Going beyond panaceas.   Ostrom E, Janssen MA and Anderies JM.    2007.   Proceedings of the National Academy of Sciences of the United States of America, volume 104, pages 15176-15178.

(2190) The decline of cross-species intersensory perception in human infants.   Lewkowicz DJ and Ghazanfar AA.   2006.   Proceedings of the National Academy of Sciences of the United States of America, volume 103, pages 6771-6774.   Where were the parents during the test procedures? Was the differential effect of separation anxiety on different age groups considered?