1. W. R. Adey,Studies of Hippocampal Electrical Activity During Approach Learning, in:Brain Mechanisms and Learning (Eds. A. Fessard, R.W. Gerard and J. Konorski; Blackwell, Oxford 1961), p. 577–588.
2. A. Arduini andM. G. Arduini,Effect of Drugs and Metabolic Alterations on Brain Stem Arousal Mechanism, J. Pharmac. exp. Ther.110, 76–85 (1954).
3. M. A. B. Brazier,The Electrical Activity of the Nervous System (MacMillan, New York 1958), p. 186–192.
4. R. A. Breen andJ. L. McGaugh,Facilitation of Maze Learning with Posttrail Injections of Picrotoxin, J. comp. physiol. Psychol.54, 498–501 (1961).
5. W. H. Calhoun,Effect of Level of External Stimulation on Rate of Learning and Interaction of this Effect with Strychnine Treatment in Mice, Psychol. Rep.18, 715–722 (1966).