Recent Publications (for full list, click here):

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]

Bulloch, M. J., & Opfer, J. E. (2009). What makes relational reasoning smart? Revisiting the relational shift in cognitive development. Developmental Science, 12, 114 - 122. [.pdf]

Furlong, E. E., & Opfer, J. E. (2009). Cognitive constraints on how economic rewards affect cooperation. Psychological Science, 20, 11 - 16.[.pdf]

Siegler, R. S., Thompson, C. A., & Opfer, J. E. (2009). The logarithmic-to-linear shift: One learning sequence, many tasks, many time scales. Mind, Brain, and Education, 3, 143 -  150. [.pdf]