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Journal of Deaf Studies and Deaf Education Advance Access published online on April 6, 2006
The Journal of Deaf Studies and Deaf Education, doi:10.1093/deafed/enj038
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received December 16, 2005
Revised March 7, 2006
Accepted March 14, 2006

Article

Subitizing, Magnitude Representation, and Magnitude Retrieval in Deaf and Hearing Adults

Rebecca Bull 1 *, Gary Blatto-Vallee 2, and Megan Fabich 2

1 University of Aberdeen
2 National Technical Institute for the Deaf, Rochester Institute of Technology

* To whom correspondence should be addressed.
Rebecca Bull, E-mail: r.bull{at}abdn.ac.uk


  Abstract

This study examines basic number processing (subitizing, automaticity, and magnitude representation) as the possible underpinning of mathematical difficulties often evidenced in deaf adults. Hearing and deaf participants completed tasks to assess the automaticity with which magnitude information was activated and retrieved from long-term memory (using a Stroop-like paradigm to assess congruity effects), the representational format of magnitude information (by analysis of distance and Spatial Numerical Association of Response Codes effects), and the ability to rapidly enumerate small sets (subitizing). Both groups showed distance effects taken to indicate the use of a visual-spatial analog number line representing approximate quantity. Furthermore, both groups showed similar patterns of performance on the subitizing tasks and showed similar amounts of interference in an analysis of congruity effects. This is taken as evidence against the notion that idiosyncratic differences in basic number processing account for mathematical difficulties experienced by deaf individuals.


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