Table 2.

Summary of selected acoustic measures expected to reflect speech characteristics of Parkinson's disease (PD) and/or linguistic differences between American English (AE) and Korean: acoustic vowel space (AVS), voice onset time (VOT), normalized pairwise variability index for vocalic intervals (nPVI-V), and articulation rate (AR).

Measure	Related characteristics of PD	Related linguistic differences between AE and Korean
		AE	Expected weight	Korean
AVS	Reduced	11 or 12 monophthongs	>	7 monophthongs
VOT	Reduced	2 cognates (voiced, voiceless)	<	3 cognates (lax, aspirated, tense)
nPVI-V	Slightly reduced to normal	Stress-timed	>	Syllable-timed
AR	Normal to fast	Similar	=	Similar