Dyslexic and normal readers' eye movements.

Authors:
  • RORichard K. Olson
    Richard K. Olson
  • RKReinhold Kliegl
    Reinhold Kliegl
  • BDBrian J. Davidson
    Brian J. Davidson
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Abstract
Dyslexic and normal readers' eye movements were compared while tracking a moving fixation point and in reading. Contrary to previous reports, the dyslexic and normal readers did not differ in their number of saccades, percentage of regressions, or stability of fixations in the tracking task. Thus, defective oculomotor control was not associated with or a causal factor in dyslexia, and the dyslexics' abnormal eye movements in reading must be related to differences in higher cognitive processes. However, individual differences in oculmotor efficiency, independent of reading ability, were found within both the dyslexic and normal groups, and these differences were correlated in reading and tracking tasks.