The impact of central sparing on the word-length effect in hemianopia

ABSTRACT

Studies suggest that a word-length effect of up to 160 ms/letter distinguishes hemianopic dyslexia from pure alexia. However, partial preservation of central vision is common in right hemianopia, but its effects on single-word reading are unknown. Eighteen healthy subjects read single words with a gaze-contingent right hemianopia simulation that varied the degree of central sparing. Mean reading onset time declined with small degrees of central sparing, but the word-length effect did not decrease until sparing exceeded 3.15°. We next evaluated the effects of font size. Effects of central sparing were constant when expressed in number of letters, with a decline in word-length effect beginning as sparing approached 4 letters. We conclude that the effects of central sparing on mean reading onset time and the word-length effect are distinct. We provide diagnostic word-length criteria for discriminating between pure alexia and hemianopic dyslexia with various degrees of central sparing.

KEYWORDS:

• Alexia
• font
• hemianopic dyslexia
• macular sparing
• reading

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

J.B. was supported by a Canada Research Chair [grant number 950-228984]; and the Marianne Koerner Chair in Brain Diseases.