1. Karmanova, I.G., Evolution of Sleep, Basel: Karger, 1982.
2. Gallup, G.G., Tonic Immobility: The Role of Fear and Predation, Psychol. Res., 1977, vol. 27, pp. 41–61.
3. Sanberg, P.R., Bunsey, M.D., Giordano, M., and Norman, A.B., The Catalepsy Test: Its Ups and Downs, Behav. Neurosci., 1988, vol. 102, pp. 748–759.
4. Klemm, W.R., Behavioral Inhibition, Brainstem Mechanisms of Behavior, Klemm, W.R. and Vertes, R.P., Eds., New York: Wiley, 1990, pp. 497–553.
5. Dixon, A.K., Ethological Strategies for Defense in Animals and Humans: Their Role in Some Psychiatric Disorders, Br. J. Med. Psychol., 1998, vol. 71, pp. 417–445.