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Gepubliceerd in: Psychological Research 3/2016

15-12-2015 | Original Article

Processing multi-digit numbers: a translingual eye-tracking study

Auteurs: Julia Bahnmueller, Stefan Huber, Hans-Christoph Nuerk, Silke M. Göbel, Korbinian Moeller

Gepubliceerd in: Psychological Research | Uitgave 3/2016

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Abstract

The present study aimed at investigating the underlying cognitive processes and language specificities of three-digit number processing. More specifically, it was intended to clarify whether the single digits of three-digit numbers are processed in parallel and/or sequentially and whether processing strategies are influenced by the inversion of number words with respect to the Arabic digits [e.g., 43: dreiundvierzig (“three and forty”)] and/or by differences in reading behavior of the respective first language. Therefore, English- and German-speaking adults had to complete a three-digit number comparison task while their eye-fixation behavior was recorded. Replicating previous results, reliable hundred-decade-compatibility effects (e.g., 742_896: hundred-decade compatible because 7 < 8 and 4 < 9; 362_517: hundred-decade incompatible because 3 < 5 but 6 > 1) for English- as well as hundred-unit-compatibility effects for English- and German-speaking participants were observed, indicating parallel processing strategies. While no indices of partial sequential processing were found for the English-speaking group, about half of the German-speaking participants showed an inverse hundred-decade-compatibility effect accompanied by longer inspection time on the hundred digit indicating additional sequential processes. Thereby, the present data revealed that in transition from two- to higher multi-digit numbers, the homogeneity of underlying processing strategies varies between language groups. The regular German orthography (allowing for letter-by-letter reading) and its associated more sequential reading behavior may have promoted sequential processing strategies in multi-digit number processing. Furthermore, these results indicated that the inversion of number words alone is not sufficient to explain all observed language differences in three-digit number processing.
Voetnoten
1
Note that these results have to be treated with caution. In the stimulus set used, hundred-decade-compatibility was confounded with overall numerical distance. More precisely, hundred-decade compatible number pairs had, on average, a larger numerical distance than hundred-decade incompatible number pairs (419 vs. 349 respectively). As large overall numerical distance and compatible number pairs both lead to a better performance, it is not clear whether the more pronounced hundred-decade-compatibility effect can be attributed solely to the manipulation of hundred-decade-compatibility.
 
2
As we are dealing with relative probabilities, the probability for fixating unit digits is identical to 1 – the combined probabilities of hundreds and tens being fixated which leads to identical statistics as presented for the univariate ANOVA run on relative TRT on the unit digit.
 
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Metagegevens
Titel
Processing multi-digit numbers: a translingual eye-tracking study
Auteurs
Julia Bahnmueller
Stefan Huber
Hans-Christoph Nuerk
Silke M. Göbel
Korbinian Moeller
Publicatiedatum
15-12-2015
Uitgeverij
Springer Berlin Heidelberg
Gepubliceerd in
Psychological Research / Uitgave 3/2016
Print ISSN: 0340-0727
Elektronisch ISSN: 1430-2772
DOI
https://doi.org/10.1007/s00426-015-0729-y

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