Objective
Athetoid cerebral palsy is a nonprogressive disorder, due to hypoxic injury or jaundice in basal ganglia, characterized by impairment of postural reflexes, arrhythmical involuntary movements, and dysarthria. Dysarthria is a group of motor speech disorder resulting from a disturbance of motor control of the speech mechanism. The purpose of this study is to evaluate the acoustic characteristics of dysarthria in athetoid cerebral palsy.

Method
We investigated the acoustic characteristics of dysarthria in 8 male patients with athetoid cerebral palsy and 6 males as a control group using Computerized Speech Laboratory (i.e., Multi-Dimensional Voice Program (MDVP), Visi-Pitch, and Electroglottography) and Nasometer.

Results
In the MDVP analysis, average fundamental frequency, jitter, and shimmer are significantly increased in patient group as compared to control group (p＜0.05). In the Visi-Pitch analysis, maximal phonation and diadochokinetic rate are significantly decreased in patient group (p＜0.05). The athetoid cerebral palsied patients have many pitch breaks. Nasalance is not significantly decreased in patient group in comparision with control group.

Conclusion
We think that average fundamental frequency, jitter and shimmer are increased and maximal phonation time and diadochokinetic rate are decreased in athetoid cerebral palsied patients.