(71) Some certainty for the " zone of uncertainty"? Exploring the function of the zona incerta.   Mitrofanis J.   2005.   Neuroscience, volume 130, pages 1-15.

(72) Attack and defense in rodents as ethoexperimental models for the study of emotion.   Blanchard RJ and Blanchard DC.   1989.   Progress In Neuro-Psychopharmacology and Biological Psychiatry, volume 13, supplement, pages S3-S14.

(73) Concise Oxford Textbook of Medicine. Ledingham JGG and Warrell DA, Editors.   Oxford University Press.   2000.

(74) Neuronal activity throughout the primate mediodorsal nucleus of the thalamus during oculomotor delayed-responses. 1. Cue-, delay-, and response-period activity.   Watanabe Y and Funahashi S.   2004.   Journal of Neurophysiology, volume 92, pages 1738-1755.

(75) Evolution on the level of communities.   Wilson D.   1976.   Science, volume 192, pages 1358-1360.

(76) A direct input from the amygdala to the thalamus and the cerebral cortex.   Krettek JE and Price JL.   1974.   Brain Research, volume 67, pages 169-174.

(77) Developmental cheating in the social bacterium Myxococcus xanthus.   Velicer GJ, Kroos L and Lenski RE.   2000.   Nature, volume 404, pages 598-601.    Comment. Bacterial cheaters.   Strassmann JE.   2000.   Nature, volume 404, pages 555-556.

(78) The evolution of altruistic behaviour.   Hamilton WD.   1963.   The American Naturalist, volume 97, pages 354-356.

(79) The evolution of reciprocal altruism.   Trivers R.   1971.   The Quarterly Review of Biology, volume 46, pages 35-57.

(80) Altruistic punishment in humans.   Fehr E and Gachter S.   2002.   Nature, volume 415, pages 137- 140.