Summary
Intonation is one of the prosodic features manifested acoustically in the fundamental
frequency (f0). Intonation abnormality is common and prominent in the speech of persons
with Parkinson's disease (PD). The current research investigated acoustically five
intonational features including f0 declination, f0 resetting, sentence stress, terminal
fall, and syntactic prejunctural fall in 20 PD participants, receiving Lee Silverman
Voice Treatment (LSVT)-LOUD alone, or combined with transcranial magnetic stimulation
delivered to the left or right primary laryngeal motor cortex. The results revealed
that f0 declination, sentence stress, and terminal fall changed significantly from
pre- to post-treatment, and the changes of declination and terminal fall were maintained
at the follow-up evaluations. The observed changes in intonation were attributed to
LSVT alone, which caused large changes of f0 magnitude. f0 resetting and syntactic
prejunctural fall did not change significantly following treatment, probably because
these intonational features need very precise fine motor control of the intrinsic
laryngeal muscles to make small-range, rapid f0 adjustments, which were not improved
by LSVT in the present PD participants. Difficulties with syntactic processing previously
reported in PD may have also contributed to the lack of improvement in resetting and
prejunctural fall, since these f0 features are used to mark syntactic boundaries within
utterances.
Key Words
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Article info
Publication history
Published online: January 15, 2021
Accepted:
December 15,
2020
Footnotes
Declaration of Interests: none.
Funding: Dr. Shalini Narayana received the Michael J. Fox Foundation for Parkinson Research, Therapeutic Pipeline award.
Identification
Copyright
© 2020 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
