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Are children with developmental dyslexia all the same? A cluster analysis with more than 300 cases

Giofré, D, Toffalini, E, Provazza, S, Calcagni, A, Altoe, G and Roberts, DJ (2019) Are children with developmental dyslexia all the same? A cluster analysis with more than 300 cases. Dyslexia, 25 (3). pp. 284-295. ISSN 1076-9242

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Open Access URL: https://doi.org/10.1002/dys.1629 (Published version)


Reading is vital to every aspect of modern life, exacerbated by reliance of the internet, email, and social media on the written medium. Developmental dyslexia (DD) characterizes a disorder in which the core deficit involves reading. Traditionally, DD is thought to be associated with a phonological impairment. However, recent evidence has begun to suggest that the reading impairment in some individuals is provoked by a visual processing deficit. In this paper, we present WISC‐IV data from more than 300 Italian children with a diagnosis of DD to investigate the manifestation of phonological and visual subtypes. Our results indicate the existence of two clusters of children with DD. In one cluster, the deficit was more pronounced in the phonological component, while both clusters were impaired in visual processing. These data indicate that DD may be an umbrella term that encompasses different profiles. From a theoretical perspective, our results demonstrate that dyslexia cannot be explained in terms of an isolated phonological deficit alone; visual impairment plays a crucial role. Moreover, general rather than specific accounts of DD are discussed.

Item Type: Article
Uncontrolled Keywords: 1303 Specialist Studies in Education, 1701 Psychology, 1702 Cognitive Sciences
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RJ Pediatrics > RJ101 Child Health. Child health services
Divisions: Psychology (from Sep 2019)
Publisher: Wiley
Related URLs:
Date Deposited: 02 Oct 2019 10:17
Last Modified: 04 Sep 2021 08:48
DOI or ID number: 10.1002/dys.1629
URI: https://researchonline.ljmu.ac.uk/id/eprint/11438
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