1. Berkley, M. A., Kling, J. W.: A small animal table coupler with vertical movement compensation. Physiol. and Behavior 2, 315?316 (1967).
2. Beyra, M., Voisin, M. F., Duchesne, M.: Influence de l'illumination ambiante et des param�tres de la stimulation �lectrique sur le comportement d'autostimulation du rat. Arch. intern. Physiol. Biochem. 77, 348?350 (1969a).
3. ? ? ?: Influence des param�tres de la stimulation �lectrique sur le comportement d'autostimulation du rat. J. Physiol. (Paris) 61, Suppl. 2, 223 (1969b).
4. Bollinger, S. F., Gerall, A. A.: Intracranial self-stimulation and impedance as functions of electrode and stimulus source. Amer. J. Physiol. 220, 264?269 (1971).
5. Geivers, H., Nuyens, R., Vansteenbergen, R., Wauquier, A.: Fully automatic stimulator used in self-stimulation experiments for studying behavioural patterns in the rat. (In preparation.)