1. Dement, W., Science, 131, 1705 (1960).
2. Dement, W., paper presented at the annual meeting, Assoc. Psychophysical. Study of Sleep, Chicago (March 1962).
3. Berger, R. J., Science, 134, 840 (1961).
4. Jacobson, A., Kales, A., Lehmann, D., and Hoedemaker, F. S., Exp. Neurol., 10, 418 (1964).
5. Dement, W., Science and Psychoanalysis, 7, edit. by Masserman, J. (Grune Stratton, Inc., New York, 1964).