Perci: a method for rating palatal efficiency.

This paper describes a new, simple technique for instantaneously rating velopharyngeal competency during speech. The instrument, designed on the basis of data obtained from aerodynamic studies, provides an index of palatopharyngeal closure. Results from model studies and 75 cleft palate subjects demonstrate how the instrument is used to differentiate between problems related to velopharyngeal closure and those resulting from other variables which often influence the performance of speakers with cleft palate.