1. Silk, J.B. Science 317, 1347–1351 (2007).
2. Dunbar, R.I.M. Evol. Anthropol. 6, 178–190 (1998).
3. Buchanan, T.W., Tranel, D. & Adolphs, R. in The Human Amygdala (eds. Whalen, P.J. & Phelps, E.A.) 289–318 (Guilford, New York, 2009).
4. Adolphs, R. Annu. Rev. Psychol. 60, 693–716 (2009).
5. Freese, J.L. & Amaral, D.G. in The Human Amygdala (eds. Whalen, P.J. & Phelps, E.A.) 3–42 (Guilford Press, New York, 2009).