Physical similarity or numerical representation counts in same-different, numerical comparison, physical comparison, and priming tasks?

Li Zhang, Ziqiang Xin, Tingyong Feng, Yinghe Chen & Denes Szűcs
Recent studies have highlighted the fact that some tasks used to study symbolic number representations are confounded by judgments about physical similarity. Here, we investigated whether the contribution of physical similarity and numerical representation differed in the often-used symbolic same-different, numerical comparison, physical comparison, and priming tasks. Experiment 1 showed that subjective physical similarity was the best predictor of participants' performance in the same-different task, regardless of simultaneous or sequential presentation. Furthermore, the contribution of...
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