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Assessing Dyslexia at Six Year of Age
15:00

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Published on: May 1, 2020

Developmental letter position dyslexia.

Naama Friedmann1, Einav Rahamim

  • 1Language and Brain Lab, School of Education, Tel Aviv University, Tel Aviv 69978, Israel. naamafr@post.tau.ac.il

Journal of Neuropsychology
|April 1, 2009
PubMed
Summary
This summary is machine-generated.

Developmental letter position dyslexia (LPD) is identified in Hebrew speakers, revealing a specific deficit in encoding letter order within words. This finding distinguishes it from acquired LPD and highlights a unique challenge in reading development.

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Area of Science:

  • Cognitive Neuroscience
  • Developmental Psychology
  • Linguistics

Background:

  • Letter position dyslexia (LPD) is a peripheral reading disorder characterized by errors in letter sequencing within words.
  • Previously, LPD has only been documented in its acquired form, typically following brain injury.
  • The existence of developmental LPD has not been previously established.

Purpose of the Study:

  • To investigate the presence and characteristics of developmental letter position dyslexia (LPD) in Hebrew-speaking individuals.
  • To explore the specific types of reading errors and their impact in developmental LPD.
  • To determine if letter position encoding is a distinct function within the visual orthographic system.

Main Methods:

  • A cohort of 11 Hebrew-speaking individuals with developmental dyslexia were assessed.
  • A battery of tests was employed, including reading aloud, lexical decision, same-different decision, definition tasks, and letter naming.
  • Error patterns were analyzed to identify specific deficits in letter order processing.

Main Results:

  • Individuals with developmental LPD exhibited a deficit in encoding letter positions within words, leading to underspecified representations.
  • Errors predominantly occurred with adjacent middle letters, especially when the transposition formed a valid word.
  • Participants did not display deficits in output processing or phonemic awareness.

Conclusions:

  • The findings support the existence of a distinct letter position encoding function within the orthographic visual analyzer.
  • Developmental LPD is characterized by selective deficits in letter order, separate from letter identification or word binding.
  • This study establishes developmental LPD as a distinct entity within the spectrum of reading disorders.