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Conducting a Comprehensive Voice Assessment in Parkinson’s Disease - page 10 / 22

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INSTRUMENTATION…CONT’D

V.  Oral Scope                 –  Solid/rigid glass rod provides  excellent picture

VI. Nasal Scope -           --  Flexible fiber optic cable - helps identify vocal  

                                            pathology  during connected speech

VII. Flexible Endoscope --  Reveals velar, pharyngeal & tongue movement   

                                             contributing to vocal tremor

VIII. Spectrography       -- Measures degree of tremor  during phonation       

                                         -- Reveals irregular pitch periods    

                                                -- Vocal Folds may appear normal at rest in PD;

                                                --- Identifies incomplete vocal fold closure or  

                                            “bowing” – can cause breathiness & reduced

                                              loudness.

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