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Psychological Science|November 29, 2008
Cognitive constraints on how economic rewards affect cooperationEllen E Furlong, John E OpferChild Development|November 17, 2010
How 15 hundred is like 15 cherries: effect of progressive alignment on representational changes in numerical cognitionClarissa A Thompson, John E OpferCognitive Psychology|September 3, 2004
Revisiting preschoolers' living things concept: a microgenetic analysis of conceptual change in basic biologyJohn E Opfer, Robert S SieglerChild Development|May 21, 2008
The trouble with transfer: insights from microgenetic changes in the representation of numerical magnitudeJohn E Opfer, Clarissa A ThompsonPsychological Science|May 14, 2003
The development of numerical estimation: evidence for multiple representations of numerical quantityRobert S Siegler, John E OpferDevelopmental Science|October 31, 2012
Learning without representational change: development of numerical estimation in individuals with Williams syndromeJohn E Opfer, Marilee A MartensDevelopmental Science|September 3, 2011
The powers of noise-fitting: reply to Barth and PaladinoJohn E Opfer, Robert S Siegler, Christopher J YoungDevelopmental Science|August 18, 2010
Early development of spatial-numeric associations: evidence from spatial and quantitative performance of preschoolersJohn E Opfer, Clarissa A Thompson, Ellen E FurlongPsychological Science|June 25, 2014
The value of numbers in economic rewardsFrank J Kanayet, John E Opfer, William A CunninghamChild Development|December 23, 2011
Children are not like older adults: a diffusion model analysis of developmental changes in speeded responsesRoger Ratcliff, Jessica Love, Clarissa A Thompson, et al.Pageof 6