1. Hebb, D.O. (1949) The Organization of Behavior, Wiley
2. Hayek, F.A. (1952) The Sensory Order, University of Chicago Press
3. Kandel, E.R. (1991) in Principles of Neural Science (Kandel, E.R., Schwartz, J.H. and Jessell, T.M., eds), pp. 1009–1031, Prentice Hall