Naming Speed

Learning and Individual Differences

Volume 18, Issue 2, 2nd Quarter 2008, Pages 224-236     Source 

Naming speed in dyslexia and dyscalculia

Edith Willburgera, , , Barbara Fusseneggera, Kristina Molla, Guilherme Wooda and Karin Landerlb

aUniversity of Salzburg, Austria

bUniversity of Tübingen, Germany

Received 15 May 2007;  revised 7 January 2008;  accepted 21 January 2008.  Available online 11 February 2008. 


In four carefully selected samples of 8- to 10-year old children with dyslexia (but age adequate arithmetic skills), dyscalculia (but age adequate reading skills), dyslexia/dyscalculia and controls a domain-general deficit in rapid automatized naming (RAN) was found for both dyslexia groups. Dyscalculic children exhibited a domain-specific deficit in rapid naming of quantities. This finding is in line with recent assumptions that dyscalculia is associated with a neurobiological deficit in the processing of numerosities. In the dyslexia/dyscalculia group, RAN deficits were additive, that is, the dyslexia/dyscalculia group exhibited the sum of the deficits found in the dyslexia only and dyscalculia only groups. This finding suggests that the cognitive bases of dyslexia and dyscalculia are independent from each other. Within the naming speed paradigm no differential impact of special demands on the executive functions inhibition and shifting was found for any of the four groups.

Keywords: Rapid naming; Dyslexia; Dyscalculia; Comorbidity; Executive functions

Article Outline

1. Methods

1.1. Participants

2. Tasks

2.1. Tasks and procedure

2.1.1. Reading

2.1.2. Arithmetic

2.1.3. Attention

2.2. RAN tasks

2.3. RAN tasks with additional EF-demands

2.3.1. Object-inhibition

2.3.2. Quantity-inhibition

2.3.3. Object-shifting

2.3.4. Object-inhibition-shifting

3. Results

3.1. Attention

3.2. RAN tasks

3.3. RAN tasks with additional EF-demands

4. Discussion

5. Conclusions



Corresponding author. Department of Psychology, University of Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria.