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Titolo:
The effect of contrast on reading speed in dyslexia
Autore:
OBrien, BA; Mansfield, JS; Legge, GE;
Indirizzi:
Univ Minnesota, Dept Psychol, Minneapolis, MN 55455 USA Univ Minnesota Minneapolis MN USA 55455 sychol, Minneapolis, MN 55455 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 14, volume: 40, anno: 2000,
pagine: 1921 - 1935
SICI:
0042-6989(2000)40:14<1921:TEOCOR>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
COHERENT MOTION DETECTION; LOW-VISION; POOR READERS; DISABLED READERS; VISUAL-SEARCH; SENSITIVITY; PSYCHOPHYSICS; DISABILITY; LUMINANCE; CHILDREN;
Keywords:
dyslexia; contrast; reading;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: O'Brien, BA 154 Canton St, Providence, RI 02908 USA 154 Canton St Providence RI USA 02908 rovidence, RI 02908 USA
Citazione:
B.A. O'Brien et al., "The effect of contrast on reading speed in dyslexia", VISION RES, 40(14), 2000, pp. 1921-1935

Abstract

Contrast coding has been reported to differ between dyslexic and normal readers. Dyslexic readers require higher levels of contrast to detect sinewave gratings for certain spatiotemporal conditions, and dyslexic readers showfaster visual search at low contrast. We investigated whether these differences in early contrast coding generalize to reading performance by measuring reading speed as a function of text contrast for dyslexic children and adults and for age-matched controls. Contrast affected reading performance of dyslexic and normal readers similarly. For both groups, reading speed wasrelatively constant between 100 and 2% contrast, and decreased rapidly below 2% contrast. This pattern of results held true for both children and adults, for text with and without sentence context, across a range of character sizes, and for reading aloud and reading silently. We conclude that earlier findings of group differences in contrast effects on grating detection or visual search tasks do not generalize to reading. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 12:56:29