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Hemispheric lateralization of arithmetic facts and magnitude processing for two-digit numbers

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posted on 21.01.2021, 11:07 authored by Stefanie Jung, Korbinian MoellerKorbinian Moeller, Hans-Otto Karnath, Elise Klein
In the human brain, a (relative) functional asymmetry (i.e., laterality; functional and performance differences between the two cerebral hemispheres) exists for a variety of cognitive domains (e.g., language, visual-spatial processing, etc.). For numerical cognition, both bi-lateral and unilateral processing has been proposed with the retrieval of arithmetic facts postulated as being lateralized to the left hemisphere. In this study, we aimed at evaluating this claim by investigating whether processing of multiplicatively related triplets in a number bisection task (e.g., 12_16_20) in healthy participants (n = 23) shows a significant advantage when transmitted to the right hemisphere only as compared to transmission to the left hemisphere. As expected, a control task revealed that stimulus presentation to the left or both visual hemifields did not increase processing disadvantages of unit-decade incompatible number pairs in magnitude comparison. For the number bisection task, we replicated the multiplicativity effect. However, in contrast to the hypothesis deriving from the triple code model, we did not observe significant hemispheric processing asymmetries for multiplicative items. We suggest that participants resorted to keep number triplets in verbal working memory after perceiving them only very briefly for 150 ms. Rehearsal of the three numbers was probably slow and time-consuming so allowing for interhemispheric communication in the meantime. We suggest that an effect of lateralized presentation may only be expected for early effects when the task is sufficiently easy.

Funding

German Research Foundation (KL 2788/2-1 and KA 1258/24-1)

Margarete von Wrangell Fellowship (European Social Fund and the Ministry of Science, Research and the Arts Baden-Württemberg)

History

School

  • Science

Department

  • Mathematics Education Centre

Published in

Frontiers in Human Neuroscience

Volume

14

Publisher

Frontiers Media

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Frontiers Media under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

27/02/2020

Publication date

2020-03-24

Copyright date

2020

ISSN

1662-5161

eISSN

1662-5161

Language

en

Depositor

Prof Korbinian Moeller. Deposit date: 19 January 2021

Article number

88