Instrumental Modification of Hypernasal Voice Quality in Retarded Children: Case Reports

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Abstract
A bioelectric system for detecting and measuring voice parameters, The Oral Nasal Acoustic Ratio (TONAR), was used to explore its potential for reducing nasality in three mentally retarded children with hypernasality. All three reduced their hypernasality during a three-week treatment period. Concomitant improvements in speech intelligibility occurred in two of the children. While replication studies are definitely warranted, the findings strongly suggest that many educable mentally retarded children do have the potential for modifying their hypernasality and that TONAR appears to have significant clinical potential for such children.

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