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. Author manuscript; available in PMC: 2013 Oct 15.
Published in final edited form as: Psychol Sci. 2013 Aug 6;24(10):2013–2019. doi: 10.1177/0956797613482944

Figure 1.

Figure 1

Training and transfer effects in Experiment 1. A. Improvement in non-symbolic approximate arithmetic performance over ten sessions. The vertical axis indicates the numerical distance between the correct answer and the alternative in a log scale. As participants progressed, they required more difficult comparisons to maintain 70-85% accuracy as indicated by lower log difference values. Solving a 1:2 ratio is equivalent to solving a log difference value of 1. A 2:3 ratio is roughly equivalent to a log difference value of 0.59. B. The standardized gain scores for symbolic math and vocabulary. Positive gain scores indicate better post-test compared to pre-test scores. On average, ANS training group solved 9.3 more problems correctly and the control group solved 0.3 more problems correctly after training. Error bar represents the standard error of the mean.