Spelling transparency and its impact on dyslexic and unimpaired children's memory for words.

The phonologically transparent Persian orthography is normally transcribed with two distinct spellings; words spelled with vowels (letters) transcribed as a fixed part of the spelling (transparent) and words spelled with vowels (diacritics) omitted (opaque). Three groups of Persian readers, namely developmental dyslexics (n=29, mean age=9.4, SD=1.