| ultrasound {assist} | R Documentation |
Ultrasound imaging of the tongue shape
Description
The 'ultrasound' data frame has 1,215 rows and 4 columns of data from an ultrasound experiment
Usage
data(ultrasound)
Details
A Russian speaker produced the consonant sequence, /gd/, in three different linguistic environments: '2words', 'cluster' and 'Schwa', with three replications for each environment. 15 points from each of 9 slices of toungue curves separated by 30 ms (milliseconds) are extracted. Therefore, in total there are 15*9*3*3=1,215 observations.
Format
The data frame contains the following columns:
height a numeric vector of toungue height in mm
length a numeric vector of toungue length in mm
time a numeric vector of time in ms
env a factor with three levels: 1 2 and 3 for environment '2words', 'cluster' and 'Schwa' respectively
Source
Phonetics-Phonology Lab of New York University.
references
Davidson, L. (2006). Comparing Tongue Shapes from Ultrasound Imaging Using Smoothing Spline Analysis of Variance. Journal of the Acoustical Society of America 120, 407-415.