An MRIbased crosslinguistic study of sibilant fricatives

About This Presentation

Title:

An MRIbased crosslinguistic study of sibilant fricatives

Description:

sagittal. scan duration. TR. TE. slice thickness and spacing ... mid-sagittal slice. tongue shape. palatalization index = front cavity area = Results ... – PowerPoint PPT presentation

Number of Views:91

Avg rating:3.0/5.0

Slides: 22

Provided by: caviUni

Category:

more less

Transcript and Presenter's Notes

Title: An MRIbased crosslinguistic study of sibilant fricatives

1
An MRI-based cross-linguistic study of sibilant
fricatives

Martine Toda 1,2 Kiyoshi Honda 1
1 ATR, Human Information Science Laboratories,
Japan.
2 Laboratoire de Phonétique et Phonologie UMR
7018, Université Paris III / CNRS, France.

2
Sibilant fricatives

Fricatives produced with clenched teeth (or the
upper teeth close to the lower lip)
(Ladefoged and Maddieson, 1996)
Acoustically characterized by a loud frication
noise (Shadle, 1985)
Distinguished each other by their noise spectrum
(Harris, 1958)

3
Sibilants a consonantal subsystem
Sibilant fricatives in Toda (a Dravidian language
spoken in India), Ladefoged and Maddieson (1996,
p.160)
4
Aims of the study

To examine
how sibilants are contrasted with each other in
articulation
and
how the articulatory space is delimited by
phonological features

5
Method
6
Languages, sibilants and subjects
2 sibilants systems
7
MRI data acquisition

Sibilant fricatives
Sustained fricatives
Supine position
Teeth
tongue and lips kept tightly close to teeth

The Shimadzu-Marconi ECLIPSE 1.5T scanner at
ATRs Brain Activity Imaging Center
8
Redeeming teeth
original MRI data
merging teeth and articulatory data
sibilants

extracted teeth shape
teeth
upper teeth lower teeth
extraction helped by rough hand tracing
The three data sets are manually fitted in Intage
rv (KGT Inc.) Estimated precision 0.25
mm and 0.5
9
Articulatory measurements
place of articulation
tongue shape
mid-sagittal slice
10
Results
11
s
12
sj and ?

J.
Ch.
Ch.
Sw.
J.
13
? and ?

Ch.
Fr.
En.
Fr.
Ch.
Sw.
14
Discussion
15
Feature specification and articulatory space
16
Redundant feature specification
17
Inventory size and articulatory space
18
Conclusion
19
Summary

/s/ front, /sj and ?/ long constriction, /? and
?/ back and /?/ shorter constriction than /?/ in
3 sibilants languages
Articulatory space split into smaller parts when
a feature (dimension) is consistent
Articulation specified for all consistent
features even when redundant
Size of articulatory space do not directly depend
on inventory size

20
Further challenges