Forthcoming:

Opfer, J. E., & Siegler, R. S. (in press). Development of quantitative thinking. In K. Holyoak and R. Morrison (Eds.), Oxford Handbook of Thinking and Reasoning. [24.pdf]

Ratcliff, R., Love, J., Thompson, C. A., & Opfer, J.E. (in press). Children are not like older adults: A diffusion model analysis of developmental change in speeded responses. Child Development. [23.pdf]

2011

Opfer, J. E., Siegler, R.S., & Young, C.J. (2011). The powers of noise-fitting: Reply to Barth and Paladino. Developmental Science, 14, 1194 - 1204. [22.pdf]

Opfer, J. E., & Furlong, E. E. (2011). How numbers bias preschoolers' spatial search. Journal of Cross-Cultural Psychology, 42, 682-695. [21.pdf]

Opfer, J. E., & Sloutsky, V. M. (2011). On the design and function of rational arguments. Behavioral and Brain Sciences, 34, 85-86. [20.pdf]

Thompson, C. A., & Opfer, J. E. (2011). Learning Linear Spatial-Numeric Associations Improves Memory for Numbers. In L. Carlson, C. Hölscher and T. Shipley (Eds.), Proceedings of the XXXIII Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum.

Young, C. J., & Opfer, J. E. (2011). Psychophysics of numerical representation: A unified approach to single- and multi-digit magnitude estimation. Journal of Psychology, 219, 58-63. [19.pdf]

Young, C. J., Marciani, F., Opfer, J. E. (2011). Linear Numerical Magnitude Representations Aid Memory for Single Numbers. In L. Carlson, C. Hölscher and T. Shipley (Eds.), Proceedings of the XXXIII Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum.

2010

Kanayet, F., Opfer, J. E., & Cunningham, W. A. (2010). Electrophysiological evidence for multiple representations of number in the human brain. In S. Ohlsson & R. Catrambone (Eds.), Proceedings of the XXXII Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum.

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, 13, 761 - 771. [18.pdf]

Opfer, J. E., & Gelman, S. A. (2010). Development of the animate-inanimate distinction. In U. Goswami (Ed.), Wiley-Blackwell Handbook of Childhood Cognitive Development (pp. 213 - 238). [17.pdf]

Tang, Y., Young, C. J., Myung, J. I., Pitt, M. A., & Opfer, J. E. (2010). Optimal inference and feedback for representational change. In S. Ohlsson & R. Catrambone (Eds.), Proceedings of the XXXII Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum.

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, 81, 1768-1786. [16.pdf]

2009

Bulloch, M. J., & Opfer, J. E. (2009). What makes relational reasoning smart? Revisiting the relational shift in cognitive development. Developmental Science, 12, 114 - 122. [15.pdf]

Furlong, E. E., & Opfer, J. E. (2009). Cognitive constraints on how economic rewards affect cooperation. Psychological Science, 20, 11 - 16. [14.pdf]

Opfer, J. E., & Bulloch, M. J. (2009). Concept development. In E. Anderman & L. Anderman (Eds.), Psychology of Classroom Learning: An Encyclopedia. Detroit: Macmillan Reference.

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. [13.pdf]

2008

Opfer, J. E., & Doumas, L. A. A. (2008). Analogy and conceptual change. Behavioral and Brain Sciences, 31, 35. [12.pdf]

Opfer, J. E., & DeVries, J. (2008). Representational change and magnitude estimation: Why young children can make more accurate salary comparisons than adults. Cognition, 108, 843 - 849. [11.pdf]

Opfer, J. E., & Thompson, C. A. (2008). The trouble with transfer: Insights from microgenetic changes in the representation of numerical magnitude. Child Development, 79, 790 - 806.[10.pdf]

Thompson, C. A., & Opfer, J. E. (2008). Costs and benefits of representational change: Effect of context on age and sex differences in magnitude estimation. Journal of Experimental Child Psychology, 101, 20 - 51. [09.pdf]

2007

Opfer, J. E., & Bulloch, M. J. (2007). Causal relations drive young children's induction, naming, and categorization. Cognition, 105, 207-217. [08.pdf]

Opfer, J. E., & Siegler, R. S. (2007). Representational change and children's numerical estimation. Cognitive Psychology, 55, 169-195. [07.pdf]

Opfer, J. E., & Thompson, C. A. (2007). What is the trouble with transfer? In McNamara, D. S., &  Trafton, G. (Eds.), Proceedings of the XXIX Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum.

Opfer, J. E., Thompson, C. A., & DeVries, J. M. (2007). Why children make "better" estimates of fractional magnitude than adults. In McNamara, D. S., & Trafton, G. (Eds.), Proceedings of the XXIX Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum.

2006

Opfer, J. E., & Devries, J. (2006). How adults acquire children's representation of numeric quantity. Proceedings of the Fifth International Conference on Development and Learning, Bloomington, IN.

Opfer, J. E., & Thompson, C. A. (2006). Even early representations of numerical magnitude are spatially organized: Evidence for a directional magnitude bias in pre-reading preschoolers. In Sun, R., & Miyaki, N. (Eds.), Proceedings of the XXVIII Annual Conference of the Cognitive Science Society. Mahwah, NJ: Erlbaum

2005

Thompson, C. A., & Opfer, J. E. (2005). Everyday constraints on learning: Children's and adults' development of the major-minor distinction. In Bara, B. G., Barsalou, L.W., & Bucciarelli, M. (Eds.), Proceedings of the XXVII Annual Conference of the Cognitive Science Society, 2184-2189. Mahwah, NJ: Erlbaum.

Opfer, J. E., & Siegler, R. S. (2005). Microgenetic changes in representations of numerical magnitude. In Bara, B. G., Barsalou, L.W., & Bucciarelli, M. (Eds.), Proceedings of the XXVII Annual Conference of the Cognitive Science Society, 2184-2189. Mahwah, NJ: Erlbaum.

2004

Opfer, J. E., & Siegler, R. S. (2004). Revisiting preschoolers' living things concept: A microgenetic analysis of conceptual change in basic biology. Cognitive Psychology, 49, 301-332. 06.pdf

2003

Siegler, R. S., & Opfer, J. E. (2003). The development of numerical estimation: Evidence for multiple representations of numerical quantity. Psychological Science, 14, 237 - 243. 05.pdf

Opfer, J. E. (2003). Life, liveliness, and living kinds: How young children think about the biological world [Review of Young children's naive thinking about the biological world]. International Journal of Behavioral Development, 27, 375 - 380. 04.pdf

2002

Opfer, J. E. (2002). Identifying living and sentient kinds from dynamic information: The case of goal-directed versus aimless autonomous movement in conceptual change. Cognition, 86, 97 - 122. 03.pdf

Gelman, S. A., & Opfer, J. E. (2002). Development of the animate-inanimate distinction. In U. Goswami (Ed.), Blackwell Handbook of Childhood Cognitive Development (pp. 151 - 166). Oxford, UK: Blackwell. 02.pdf

2001

Opfer, J. E., & Gelman, S. A. (2001). Children's and adults' models for predicting teleological action: The development of a biology-based model. Child Development, 72, 1367 - 1381. 01.pdf

Concepts & Learning Lab

Psychology Building 255

1835 Neil Avenue

Columbus, OH 43210 614.292.8941