Table 2.
F1 and F2 frequency values for /a/, /i/, and /u/ at measured during the initial 250 msec and at the middle point of production, for Individuals with Parkinson’s disease with their deep-brain stimulators turned on at their normal therapeutic levels and turned off, and for normal control subjects
| Condition | /a/ | /i/ | /u/ | |||
| Initial | Middle | Initial | Middle | Initial | Middle | |
| Off – F1 | 670.7 (81) | 635.6 (77) | 310.8 (20) | 342.4 (45) | 338.0 (39) | 360.9 (56) |
| On – F1 | 656.6 (84) | 653.2 (95) | 312.4 (34) | 329.0 (30) | 332.5 (39) | 332.5 (37) |
| Nor – F1 | 708.7 (76) | 649.7 (96) | 364.8 (123) | 306.2 (24) | 335.4 (28) | 329.4 (42) |
| Off – F2 | 1157.2 (51) | 1090.5 (150) | 2364.7 (215) | 2159.1 (218) | 860.5 (113) | 851.4 (153) |
| On – F2 | 1103.6 (58) | 1145.2 (90) | 2112.9 (258) | 2238.0 (209) | 896.2 (140) | 813.4 (133) |
| Nor – F2 | 1183.2 (85) | 1252.0 (148) | 2403.0 (120) | 2239.0 (183) | 957.1 (139) | 981.5 (165) |