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Journal of Deaf Studies and Deaf Education Advance Access originally published online on February 16, 2007
The Journal of Deaf Studies and Deaf Education 2007 12(3):362-372; doi:10.1093/deafed/enm002
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The Hands Have It: Number Representations in Adult Deaf Signers

Marjolein Korvorst

University Hospital, RWTH Aachen University

Hans-Christoph Nuerk

Paris-Lodron University Salzburg

Klaus Willmes

University Hospital and Interdisciplinary Center of Clinical Research, RWTH Aachen University


  Abstract

This study examines a wide range of numerical representations (i.e., quantity, knowledge of multiplication facts, and use of parity information) in adult deaf signers. We introduce a modified version of the number bisection task, with sequential stimulus presentation, which allows for a systematic examination of mathematical skills in deaf individuals in different modalities (number signs in streaming video vs. Arabic digit displays). Reaction times and accuracy measures indicated that deaf signers make use of several representations simultaneously when bisecting number triplets, paralleling earlier findings in hearing individuals. Furthermore, some differences were obtained between the 2 display modalities, with effects being less prominent in the Arabic digit mode, suggesting that mathematical abilities in deaf signers should be assessed in their native sign language.

Correspondence should be sent to Marjolein Korvorst, Section Neuropsychology, Department of Neurology, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany (e-mail: korvorst{at}neuropsych.rwth-aachen.de).

Received August 24, 2006; revised January 7, 2007; accepted January 12, 2007


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