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Journal of Deaf Studies and Deaf Education Advance Access originally published online on April 6, 2006
The Journal of Deaf Studies and Deaf Education 2006 11(3):289-302; 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

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

Rebecca Bull

University of Aberdeen

Gary Blatto-Vallee and Megan Fabich

National Technical Institute for the Deaf, Rochester Institute of Technology

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.

Correspondence should be sent to Rebecca Bull, School of Psychology, William Guild Building, University of Aberdeen, Aberdeen, Scotland AB24 2UB, UK (e-mail: r.bull{at}abdn.ac.uk).

Received December 16, 2005; revised March 7, 2006; accepted March 14, 2006


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