Brown et al. (1997) described a family with autosomal dominant nonsyndromic postlingual hearing loss. Affected individuals experienced progressive hearing loss beginning in the second to fourth decades, eventually making use of amplification mandatory. The family was of northern ... Brown et al. (1997) described a family with autosomal dominant nonsyndromic postlingual hearing loss. Affected individuals experienced progressive hearing loss beginning in the second to fourth decades, eventually making use of amplification mandatory. The family was of northern European extraction living in Iowa.