Isolating global and specific factors in developmental dyslexia: a study based on the rate and amount model (RAM)

Experimental Brain Research
Pierluigi ZoccolottiDonatella Spinelli

Abstract

Using the reading-age match approach, research on developmental dyslexia focuses on specific (e.g., phonological) deficits and disregards the possible role of global influences in determining the disturbance. In the present study, we set out to investigate the role of both global and specific factors in Italian developmental dyslexics using the rate-amount model (RAM; Faust et al. in Psychol Bull 125:777-799, 1999). Vocal reaction times (RT) in naming pictures, words and non-words of varying length were measured in a group of 26 sixth- to eighth-grade dyslexics and 81 age-matched control readers. Dyslexics' raw RTs showed greater lexicality (longer RTs to non-words than words) and length (longer RTs to long stimuli than short ones) effects than controls'. We found that one global factor predicted most individual variation in naming words and non-words, but not pictures. When data transformations, effective in controlling for the global factor, were applied to the data, the greater lexicality effect in dyslexics vanished, due to the influence of the global factor and not a specific failure in the non-lexical reading procedure. Conversely, the greater length effect in dyslexics persisted. Overall, dyslexics' reading performance w...Continue Reading

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Citations

Feb 4, 2010·Cognitive Neuropsychology·Donatella SpinelliPierluigi Zoccolotti
Aug 3, 2013·Cognitive Neuropsychology·Mara TrentaPierluigi Zoccolotti
Mar 23, 2011·Child Neuropsychology : a Journal on Normal and Abnormal Development in Childhood and Adolescence·Despina PaiziPierluigi Zoccolotti
Oct 4, 2011·Child Neuropsychology : a Journal on Normal and Abnormal Development in Childhood and Adolescence·Gloria Di Filippo, Pierluigi Zoccolotti
Oct 18, 2013·Experimental Brain Research·Marialuisa MartelliPierluigi Zoccolotti
Dec 3, 2008·Developmental Science·Gloria Di FilippoJohannes C Ziegler
Oct 12, 2013·Dyslexia : the Journal of the British Dyslexia Association·Susana AraújoAlexandra Reis
Apr 23, 2015·Scandinavian Journal of Psychology·Miguel LázaroCristina Burani
May 6, 2016·Frontiers in Psychology·Christina MarxStefan Hawelka
Jul 27, 2010·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Eva Marinus, Peter F de Jong
Mar 9, 2011·Neuropsychologia·Chiara Valeria MarinelliPierluigi Zoccolotti
Jul 28, 2009·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Maria De LucaPierluigi Zoccolotti
Aug 7, 2010·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Paola AngelelliClaudio Luzzatti
Aug 28, 2020·Cognitive Neuropsychology·Pierluigi Zoccolotti
Jul 27, 2017·Experimental Brain Research·Maria De LucaPierluigi Zoccolotti
Mar 9, 2018·Frontiers in Psychology·Gloria Di Filippo, Pierluigi Zoccolotti

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