Descriptor
| Case Studies | 1 |
| Early Childhood Education | 1 |
| Genetics | 1 |
| Heredity | 1 |
| Language Handicaps | 1 |
| Phonology | 1 |
| Speech Handicaps | 1 |
| Voice Disorders | 1 |
Author
| Lewis, Barbara A. | 1 |
Publication Type
| Journal Articles | 1 |
| Reports - Research | 1 |
Education Level
Audience
| Researchers | 1 |
Location
Laws, Policies, & Programs
Assessments and Surveys
What Works Clearinghouse Rating
Peer reviewedLewis, Barbara A. – Journal of Speech and Hearing Disorders, 1990
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)
Descriptors: Case Studies, Early Childhood Education, Genetics, Heredity
