How Reliably Are Visual Differences Found in Dyslexics?

Abstract

Duration of visible persistence was measured in 35 control and 35 dyslexic, subjects on 3 occasions to determine the reliability of previously reported , differences between the groups on this measure. Analyses of the data revealed significant differences between the two groups in the coefficient of regression of spatial frequency on visible persistence and the regression coefficient of individuals showed high consistency across occasions. These findings suggest that visual differences between dyslexic and control subjects are both robust and reliable.