The Clinical Blurring-Speed Study

Abstract

The accidental discovery that dyslexics have two blurring speeds led to the realization that the Staten Island, Queens and blind blurring-speed studies were contaminated by unknown mixtures of diagnostic sequential blurring speeds (SBS) versus compensatory single-targeting blurring speeds (STS). In retrospect, it appeared highly likely that the unwitting measurement of STS rather than SBS significantly contributed to the older dyslexic Group II blurring speeds in the Staten Island study, the “overlap” blurring speeds in the Queens Study, the DD recognition speeds in the blind blurring-speed study, and a majority of the so-called paradoxical blurring speeds characterizing the data to date. In a bilateral effort to improve the diagnostic accuracy of the blurring-speed methodology while testing the validity of the Staten Island blurring-speed study, the author initiated a new clinical study aimed at the statistical evaluation of SBS versus STS in DD versus normal controls.