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(302) Anatomy and neurochemistry of the pair bond.   Young LJ, Murphy Young AZ and Hammock EAD.   2005.   Journal of Comparative Neurology, volume 493, pages 51-57.

(303) The "Trust Hormone"  Oxytocin makes you believe.   Nature, volume 435, 2 June 2005, front cover.    Trust in oxytocin.   Nature, volume 435, 2 June 2005, page xiii.    Comment. Brain trust.   Damasio A.   2005.   Nature, volume 435, pages 571-572.   Reference to (291), "Oxytocin increases trust in humans.   Kosfeld M, Heinrichs M, Zak PJ, Fischbacher U and Fehr E.   2005.   Nature, volume 435, pages 673-676", in which study there was no attempted disproof of the "double-blind" design.

(304) Evolution of indirect reciprocity.   Nowak MA and Sigmund K.   2005.   Nature, volume 437, pages 1291-1298.   

(305) Evolution of cooperation through indirect reciprocity.   Leimar O and Hammerstein P.   2001.   Proceedings of the Royal Society of London. Series B, volume 268, pages 745-753.

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(308) Eusociality: origin and consequences.   Wilson EO and Hölldobler B.   2005.   Proceedings of the National Academy of Sciences of the United States of America, volume 102, pages 13367-13371.

(309) Activity of tonically active neurons in the monkey putamen during initiation and holding of movement.   Lee IH, Seitz AR and Assad JA.   2006.   Journal of Neurophysiology, volume 95, pages 2391-2403.

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