1. BOURNE, L. E. Discrimination learning, information processes and other approaches. Paper presented at a symposium on “Concept attainment: several approaches,” Amer. Psychol. Assn., St. Louis, 1962.
2. CANTOR, J. H. Amount of pretraining as a factor in stimulus predifferentiation and performance set. J. exp. Psychol., 1955, 50, 180–184.
3. GLANZER, M. Systematic operations. Paper presented at a symposium on “Concept attainment: several approaches,” Amer. Psychol. Assn., St. Louis, 1962.
4. GOSS, A. E. Early behaviorism and verbal mediating responses. Amer. Psychologist, 1961, 16, 285–298. (a)
5. GOSS, A. E. Verbal mediating responses and concept formation. Psychol. Rev., 1961, 68, 248–274. (b)