Table 1 Normative values of formant frequencies in male groups of iRBD, PD and HC.

From: Articulatory undershoot of vowels in isolated REM sleep behavior disorder and early Parkinson’s disease

 

iRBD

PD

HC

 

mean/SD (range)

mean/SD (range)

mean/SD (range)

F1/a/ (Hz)

548/43 (448−627)

548/53 (452−676)

582/49 (497−667)

F2/a/ (Hz)

1331/78 (448−627)

1328/81 (1172−1567)

1350/86 (1119−1535)

F1/i/ (Hz)

331/16 (300−376)

332/18 (293−380)

348/23 (304−408)

F2/i/ (Hz)

1980/108 (1680−2179)

1931/128 (1703−2190)

2012/103 (1750−2226)

F1/u/ (Hz)

331/19 (294−377)

337/20 (295/401)

340/20 (299−405)

F2/u/ (Hz)

770/64 (661−957)

786/52 (680−894)

762.9/54 (666−903)

  1. iRBD, isolated rapid eye movement sleep behaviour disorder, PD Parkinson’s disease, HC Healthy control, F1 First formant frequency, F2 Second formant frequency
Back to article page