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Dissociation between exact and approximate addition in developmental dyslexia.

Xiujie Yang¹, Xiangzhi Meng¹

¹School of Psychological and Cognitive Sciences, Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, 100871, China; The PKU-PolyU Center for Child Development and Learning, Peking University, Beijing, 100871, China.

Research in Developmental Disabilities

|June 17, 2016

Summary

Children with dyslexia show intact approximate arithmetic but struggle with exact calculation, impacting both symbolic and non-symbolic tasks. This suggests a specific deficit in precise mental arithmetic for these children.

Keywords:

Approximation Dyslexia Exact calculation Number sense Phonological processing

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Assessing Dyslexia at Six Year of Age

Assessing Dyslexia at Six Year of Age

Published on: May 1, 2020

Area of Science:

Cognitive psychology
Developmental psychology
Neuroscience

Background:

Number sense and language are crucial for numerical representation and calculation.
Dyslexia is characterized by phonological processing deficits.
Previous research links number sense to approximate arithmetic and language to exact calculation.

Purpose of the Study:

To investigate exact calculation abilities in children with dyslexia.
To compare exact and approximate addition performance between children with and without dyslexia.
To explore the relationship between linguistic skills and exact calculation.

Main Methods:

Compared reaction time and accuracy in exact and approximate addition tasks.
Used both symbolic (Arabic digits) and non-symbolic (dot arrays) stimuli.
Included typically developing children and children with dyslexia.

Main Results:

No significant differences in reaction time between groups.
No differences in approximate addition accuracy.
Children with dyslexia exhibited significantly lower accuracy in exact addition for both symbolic and non-symbolic tasks.
Linguistic performance correlated with exact calculation abilities.

Conclusions:

Children with dyslexia have a specific deficit in exact mental arithmetic.
Approximate calculation abilities appear relatively preserved in children with dyslexia.
Exact calculation impairment in dyslexia may be linked to language processing difficulties.