Research Article
A Preliminary Report on Disordered Speech with Deep Brain Stimulation in Individuals with Parkinson's Disease
Table 5
Ratios of mean (and standard deviation) vowel RMS to mean stop closure RMS as an index of spirantization with and without stimulation.
| | Participant | Syllable | Ratio stim on | Ratio stim off |
| | F1 | /pə/ | 3.43 : 1 | 1.86 : 1 | | /tə/ | 9.60 : 1 | 5.50 : 1 | | /kə/ | 4.30 : 1 | 3.00 : 1 | | M4 | /pə/ | 13.67 : 1 | 12.50 : 1 | | /tə/ | 16.67 : 1 | 11.50 : 1 | | /kə/ | 10.50 : 1 | 6.25 : 1 | | M5 | /pə/ | 2.93 : 1 | 3.69 : 1 | | /tə/ | 9.25 : 1 | 9.15 : 1 | | /kə/ | 5.00 : 1 | 3.91 : 1 | | M8 | /pə/ | 31.00 : 1 | 18.00 : 1 | | /tə/ | 16.00 : 1 | 19.50 : 1 | | /kə/ | 12.50 : 1 | 13.50 : 1 | | M9 | /pə/ | 2.56 : 1 | 22.75 : 1 | | /tə/ | 3.59 : 1 | 12.20 : 1 | | /kə/ | 1.77 : 1 | 11.50 : 1 | | M10 | /pə/ | 7.89 : 1 | 7.60 : 1 | | /tə/ | 7.43 : 1 | 6.00 : 1 | | /kə/ | 6.86 : 1 | 5.20 : 1 |
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A higher value for the ratio reflects less severe spirantization.
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