APA Dictionary of Psychology

a type of dyslexia that is marked by an inability to sound out the individual letters and syllables of words (see phonics) and is supposedly due to difficulty with sound–symbol correspondences. There is, however, no reliable empirical evidence for this form of dyslexia. See also dyseidetic dyslexia. [proposed in 1973 by U.S. psychologist Elena Boder (1907–1995)]