Research Article
A Preliminary Report on Disordered Speech with Deep Brain Stimulation in Individuals with Parkinson's Disease
Table 3
Vocal perturbation for vowel phonation with and without stimulation.
| Participant | Variable | Stimulation on | Stimulation off |
| F1 | Jitter (%) | 7.69 | 2.35 | Shimmer (%) | 5.69 | 5.79 | HNR (dB) | 10.12 | 19.46 | M4 | Jitter (%) | 2.22 | 1.17 | Shimmer (%) | 16.57 | 8.52 | HNR (dB) | 14.01 | 18.06 | M5 | Jitter (%) | 0.43 | 0.44 | Shimmer (%) | 1.24 | 5.15 | HNR (dB) | 24.44 | 21.12 | M8 | Jitter (%) | 0.22 | 0.27 | Shimmer (%) | 0.80 | 0.77 | HNR (dB) | 27.33 | 31.49 | M9 | Jitter (%) | 0.58 | 0.62 | Shimmer (%) | 5.60 | 6.66 | HNR (dB) | 20.33 | 19.23 | M10 | Jitter (%) | 1.53 | 2.59 | Shimmer (%) | 8.36 | 12.78 | HNR (dB) | 16.57 | 13.37 |
|
|
HNR: harmonics-to-noise ratio; higher values reflect better performance. Higher jitter and shimmer percentages are reflective of greater perturbation or vocal unsteadiness.
|