Dyslexia and rapid visual processing: a commentary.

It has been suggested that dyslexia is the result of a deficit in rapid sensory processing. Several methods have been used to assess this with regards to vision: temporal contrast sensitivity, visual persistence, temporal order judgments, temporal acuity, and coherent motion. Here we examine these methods. We find that several of them--visual persistence, temporal order judgments, and coherent motion--are poorly suited to evaluating the dynamic aspects of vision. In the case of temporal contrast sensitivity and temporal acuity the results from these tests either are conflicting or provide little support for an impairment. As far as vision is concerned there is little evidence for a specifically temporal deficit.