Case studies are presented of four children, age four to six, with severe phonological disorders, demonstrating three generations of family members with speech/language problems. An autosomal dominant mode, a multifactorial-polygenic model, and a sex-specific threshold model for expression are discussed. (Author/JDD)

Forty-eight subjects (grades 1-12) with phonological disorders were identified and categorized into either Residual or Delayed groups and performance was compared with that of 24 normal individuals on various speech and language parameters. Results indicated that voice disorders, deficits in expressive language, and hearing problems occurred more…