1. Melzack, R. Sci. Am. 266, 120–128 (1992).
2. Sunderland, S. Nerves and Nerve Injuries (Saunders, Philadelphia, 1959).
3. Ramachandran, V. S. Proc. Natl. Acad. Sci. USA 90, 10413–10420 (1993).
4. Ramachandran, V. S. in Neuronal Group Selection (eds Sporns, O., Tononi, G. & Edelman, G.) (Academic Press, San Diego, 1994).
5. Franz, E. A., Zelaznik, H. N. & McCabe, G. Acta Psychol. 77, 137–151 (1991).