H.-C. Nuerk

University of Tuebingen, Tübingen, Baden-Württemberg, Germany

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Publications (8)5.17 Total impact

  • S. Huber, K. Moeller, H.-C. Nuerk
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    ABSTRACT: Recent evidence indicated that fraction pair type determined whether a particular fraction is processed holistically, componentially or in a hybrid manner. Going beyond previous studies, we investigated how participants adapt their processing of fractions not only to fraction type, but also to experimental context. To examine adaptation in fraction processing, we recorded participants' eye-fixation behaviour in a fraction magnitude comparison task. Participants' eye fixation behaviour indicated componential processing of fraction pairs with common components for which the decision-relevant components are easy to identify. Importantly, we observed that fraction processing was adapted to experimental context: Evidence for componential processing was stronger, when experimental context allowed valid expectations about which components are decision-relevant. Taken together, we conclude that fraction processing is adaptive beyond the comparison of different fraction types, because participants continuously adjust to the experimental context in which fractions are processed.
    Acta Psychologica 05/2014; 148:37-48. · 2.26 Impact Factor
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    ABSTRACT: Basic numerical representations are seen as the building block for the successful development of more complex numerical and arithmetic competencies. Extending previous studies focusing on improving basic numerical representations by means of embodied training schemes, the current study focused on an embodied training of children's place-value understanding. In this vein, 49 secondgraders were trained on solving a number line estimation task by stepping on different fields of a dance mat allowing for separate estimations of tens and units with more effort needed to step on the tens. In a partially randomized cross-over design, two control conditions were used to controll for training effects caused exclusively by the numerical content trained or the use of the dance mat. Interestingly, results revealed specific training effects after both the embodied and the control conditions. However, training effects were significantly more pronounced after the embodied training, thereby providing further evidence for the benefit of an embodied training of the place-value structure of the Arabic number system.
    Zeitschrift Fur Erziehungswissenschaft. 01/2014; 17(2):257-277.
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    E. Klein, S. Huber, H. C. Nuerk, K. Moeller
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    ABSTRACT: The operational momentum effect (OM) indicates an association of mental addition with a rightward spatial bias whereas subtraction is associated with a leftward bias. To evaluate the assumed attentional origin of the OM effect we not only evaluated participants' relative estimation error in a task requiring them to locate addition and subtraction results on a given number line but also their eye-fixation behaviour. Furthermore, to investigate the situatedness of spatial-numerical associations the orientation of the number line (left-to-right vs. right-to left) was manipulated. OM biases in participants' explicit number line estimations and more implicit eye-fixation behaviour are integrated into a two-process hypothesis of the OM effect suggesting a first rough spatial anticipation followed by an evaluation/correction process. This account is not only capable of accounting for the results observed for participants' relative estimation error but is also corroborated by the eye-fixation results. Importantly, the fact that all effects were found independent of the orientation of the number line indicates that spatial-numerical associations such as the OM effect may not be hard-wired associations of spatial and numerical representations but rather reflect influences of situatedness on numerical cognition.
    Quarterly journal of experimental psychology (2006) 01/2014; · 1.82 Impact Factor
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    ABSTRACT: Multi-digit number processing is ubiquitous in our everyday life – even in school, multi-digit numbers are computed from the first year onward. Yet, many problems children and adults have are about the relation of different digits (for instance with fractions, decimals, or carry effects in multi-digit addition). Cognitive research has mainly focused on single-digit processing, and there is no comprehensive review of the different multi-digit number processing types and effects. The current review aims to fill this gap. First, we argue that effects observed in single-digit tasks cannot simply be transferred to multi-digit processing. Next, we list 16 effect types and processes which are specific for multi-digit number processing. We then discuss the development of multi-digit number processing, its neurocognitive correlates, its cultural or language-related modulation, and finally some models for multi-digit number processing. We finish with conclusions and perspectives about where multi-digit number processing research may or should be heading in following years.
    Journal of Psychology. 01/2011; 219:3-22.
  • Prävention und Rehabilitation. 01/2009; 21:121-136.
  • K. Moeller, H.-C. Nuerk, K. Willmes
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    ABSTRACT: Over the last years, evidence has accumulated that the magnitude of two-digit numbers is not only represented as one holistic entity, but also decomposed for tens and units. Recently, Zhang and Wang (2005) suggested such separate processing may be due to the presence of external representations of numbers, whereas holistic processing became more likely when one of the to-be-compared numbers was already internalised. The latter conclusion essentially rested on unit-based null effects. However, Nuerk and Willmes (2005) argued that unfavourable stimulus selection may provoke such null effects and misleading conclusions. Therefore, we tested the conclusion of Zhang and Wang for internal standards with a modified stimulus set. We observed reliable unit-based effects in all conditions contradicting the holistic model. Thus, decomposed representations of tens and units can also be demonstrated for internal standards. We conclude that decomposed magnitude processing of multidigit numbers does not rely on external representations. Rather, even when two-digit numbers are internalised, the magnitudes of tens and units seem to be (also) represented separately.
    European Journal of Cognitive Psychology 01/2009; 21(5):672-685. · 1.09 Impact Factor
  • H.-C. Nuerk, K. Willmes
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    ABSTRACT: Zahlen werden nicht als eine Entität verarbeitet. Eine häufige Beobachtung im klinischen Alltag ist, dass Patienten bestimmte Aufgaben mit Zahlen problemlos ausführen können, während ihnen andere einfache Aufgaben große Schwierigkeiten bereiten. So können beispielsweise Pa tienten mit Läsionen im Versorgungsgebiet der linken Arteria cerebri media im Allgemeinen Größenvergleiche zwischen arabischen Zahlen noch ohne Fehler ausführen, während sie gleichzeitig unfähig sind, selbst einfachste Zahlen sicher zu benennen.
  • Article: Akalkulie
    K. Willmes, H.-C. Nuerk
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    ABSTRACT: In diesem Kapitel werden — orientiert an einem prominenten Verarbeitungsmodell für die Zahlenverarbeitung und das Rechnen — aufgrund einer Hirnschädigung erworbene oder entwicklungsbedingte Rechenstörungen behandelt. Exemplarisch wird demonstriert, wie man eine schlüssige Interpretation für das bei einer Patientin mit Akalkulie gefundene fMRT-Aktivierungsmuster geben kann, wenn man Kenntnisse über modellgeleitete Aktivierungsstudien bei gesunden Probanden, Informationen über die individuelle Hirnläsion und über das individuelle Beeinträchtigungsmuster zusammenführt.