摘要：Participants orally solved two-digit addition problems that were visually
presented. The problems either were carries (e.g., 39 + 48) or no-carries (e.g.,
34 + 53). As predicted by the triple-code model of Dehaene (1992; Dehaene &
Cohen, 1995), (a) no-carries were solved by separately adding the units and the
tens so that sums with small tens and large units (e.g., 32 + 16 = 48) were not
solved faster than sums with large tens and small units (e.g., 23 + 61 = 84),
even though problem size is much larger for the latter sum. Moreover, (b)
carries were found to be solved with the aid of “semantic elaboration” on the
number line: The logarithm of the correct sum was a more important predictor for
carries than for no-carries, even though both types of problems were matched for
problem size. These findings were found when the numbers were presented under
each other (Experiment 1), next to each other (Experiment 2) and far from each
other (Experiment 3).
关键词：two-digit addition problems, semantic elaboration, carry and no-carry problems
