Two components of the Indo-Arabic numerical size effect

Add time:07/26/2019    Source:sciencedirect.com

In the symbolic number comparison task, the size effect (better performance for small than for large numbers) is usually interpreted as the result of the more general ratio effect, in line with Weber's law. In alternative models, the size effect might be a result of stimulus frequency: smaller numbers are more frequent, and more frequent stimuli are easier to process. It has been demonstrated earlier, that in artificial new number digits, the size effect reflects the frequencies of those digits. In the present work we investigate whether frequency also directs the size effect in Indo-Arabic numbers, in which notation, unlike in new symbols, the frequencies are already firmly established for the participants. We found that frequency has an effect on the size effect in Indo-Arabic notation, but this influence is limited. However, this limited size effect change is acquired fast at the beginning of the session. We argue that these results are more in line with the frequency-based accounts of the size effect.

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