The SAGE Handbook of Dyslexia is a comprehensive overview of a complex field. It is a rich, critical assessment of past and present theory and current research, which also looks to the future. The editors have brought together key figures from the international academic world - both researchers and practitioners - to examine the relationships between theoretical paradigms, research and practice, and to map new areas of research.

Exploring Heterogeneity in Developmental Dyslexia: A Longitudinal Investigation

Exploring Heterogeneity in Developmental Dyslexia: A Longitudinal Investigation

Exploring heterogeneity in developmental dyslexia: A longitudinal investigation

This chapter is about:

  • individual differences among dyslexic children;
  • the nature of phonological and surface dyslexia; and
  • the longitudinal stability of subtypes.


Children and adults with developmental dyslexia are characterized by moderate to severe difficulties learning to read and spell printed words (Fletcher et al., 2007). Dyslexic children are often viewed in research studies, review papers and theoretical papers as a homogeneous group of individuals suffering from a fairly circumscribed set of deficits, usually phonologically based. Although this perspective captures much of the truth about dyslexic children as a group (i.e., they usually fare poorly on tests of phonological decoding, such as the ability to pronounce orthographically correct non-words, such as ...

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