Recent Publications (for full list, click here):

Kim, D. & Opfer, J.E. (2017). A unified framework for bounded and unbounded numerical estimation. Developmental Psychology, 53, 1088-1097. [.pdf]

Tosto, M.G., Garon-Carrier, G., Gross, S., Petrill, S.A., Boivin, M., Malykh, S., Malki, K., Hart, S.A., Thompson, L., Karadaghi, R., Yakovlev, N., Tikhomirova, T., Opfer, J.E., Mazzocco, M.M.M., Dionne, G., Brendgen, M., Vitaro, F., Tremblay, R.E., Plomin, R., & Kovas, Y. (2017). Number sense and mathematics: Which, when and how? Developmental Psychology, 53, 1924-1939. [.pdf]

Opfer, J. E., Thompson, C. A., & Kim, D. (2016). Free versus anchored numerical estimation: A unified approach. Cognition, 149, 11-17. [.pdf]

Kanayet, F. J., Opfer, J. E., & Cunningham, W. A. (2014). The value of numbers in economic rewards. Psychological Science. [.pdf]

McCrink, K., & Opfer, J. E. (2014). Development of spatial-numerical associations. Current Directions in Psychological Science. [.pdf]

Opfer, J. E., & Martens, M. M. (2012). Learning without representational change: Development of numerical estimation in individuals with Williams' Syndrome. Developmental Science. [.pdf]

Opfer, J. E., Nehm, R., & Ha, M. (2012). Cognitive foundations for science assessment design: Knowing what students know about evolution. Journal of Research in Science Teaching, 49, 744-777. [.pdf]

Opfer, J. E., & Siegler, R. S. (2012). Development of quantitative thinking. In K. Holyoak and R. Morrison (Eds.), Oxford Handbook of Thinking and Reasoning. [.pdf]

Ratcliff, R., Love, J., Thompson, C. A., & Opfer, J.E. (2012). Children are not like older adults: A diffusion model analysis of developmental change in speeded responses. Child Development, 83, 367-381. [.pdf]

Opfer, J. E., & Furlong, E. E. (2011). How numbers bias preschoolers' spatial search. Journal of Cross-Cultural Psychology. [.pdf]

Opfer, J. E., Siegler, R.S., & Young, C.J. (2011). The powers of noise-fitting: Reply to Barth and Paladino. Developmental Science. [.pdf]

Young, C. J., & Opfer, J. E. (2011). Psychophysics of numerical representation: A unified approach to single- and multi-digit magnitude estimation. Journal of Psychology. [.pdf]

Opfer, J. E., Thompson, C. A., & Furlong, E. E. (2010). Early development of spatial-numeric associations: Evidence from spatial and quantitative performance of preschoolers. Developmental Science. [.pdf]

Thompson, C. A., & Opfer, J. E. (2010). How 15 hundred is like 15 cherries: Effect of progressive alignment on representational changes in numerical cognition. Child Development. [.pdf]