The Effects of Practice on the Concurrent Performance of a Speech and Postural Task in Persons with Parkinson Disease and Healthy Controls
Table 3
Articulatory acoustic measures for /ɔ ɪ/ diphthong at acquisition and retention phases for each group.
Acquisition (Baseline)
Acquisition (Ending)
Retention 48 hrs
Retention 1 week
Block 1
Block 7
Block 1
Block 1
mean (SD)
mean (SD)
mean (SD)
mean (SD)
/ɔ ɪ/ duration (sec)
HY group
0.11 (0.03)
0.09 (0.04)
0.10 (0.03)
0.10 (0.03)
AM group
0.11 (0.05)
0.11 (0.04)
0.11 (0.04)
0.11 (0.04)
PD group
0.12 (0.03)
0.11 (0.02)
0.12 (0.02)
0.12 (0.03)
/ɔ ɪ/ F1 ext (Hz)
HY group
87.17 (60.83)
66.83 (84.08)
63.17 (44.42)
56.83 (77.75)
AM group
108.66 (66.39)
75.67 (45.25)
61.67 (77.00)
59.00 (68.50)
PD group
78.67 (80.83)
74.16 (48.33)
44.50 (56.12)
47.67 (24.67)
/ɔ ɪ/ F2 ext (Hz)
HY group
1066.00 (404.83)
938.17 (331.63)
997.33 (332.00)
915.00 (404.08)
AM group
1062.67 (302.67)
966.33 (248.08)
967.33 (273.92)
914.67 (231.17)
PD group
859.67 (219.00)
807.67 (290.00)
864.67 (268.33)
810.00 (308.17)
/ɔ ɪ/ F1 slope (Hz/ms)
HY group
−0.78 (0.46)
−0.80 (1.01)
−0.67 (0.52)
−0.65 (1.12)
AM group
−0.89 (1.34)
−0.70 (0.68)
−0.49 (1.20)
−0.76 (1.14)
PD group
−0.68 (0.96)
−0.70 (0.47)
−0.30 (0.70)
−0.39 (0.63)
/ɔ ɪ/ F2 slope (Hz/ms)
HY group
9.72 (3.20)
9.96 (4.22)
10.77 (4.58)
9.65 (4.93)
AM group
11.19 (6.16)
9.64 (4.68)
10.13 (4.79)
10.96 (3.76)
PD group
7.11 (2.62)*
7.41 (2.67)
6.96 (1.04)
6.44 (3.46)
HY group: healthy young adult controls; AM group: healthy age-matched controls; PD group: persons with PD. All values: median (interquartile range). Significant difference between groups.
