1. CRESPI, L. P. 1942 Quantitative variation of incentive and performance in the white rats. Amer. J. Psychol., 55, 467-517.
2. Di Lollo, V. 1964 Runway performance in relation to runway-goal-box similarity and changes in incentive amount. J. comp. physiol. Psychol., 58, 327-329.
3. DUFORT, R. H., & KIMBLE, G. A. 1956 Changes in response strength with changes in the amount of reinforcement. J. exp. Psychol., 51, 185-191.
4. GOODRICH, K. P. 1960 Running speed and drinkrate as functions of sucrose concentration and amount of consummatory activity. J. comp. physiol. Psychol., 53, 245-250.
5. GUILD, R. E. 1960 Incentive motivation in satiated rats. J. comp. physiol. Psychol., 53, 351-358.