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LSVT eila ppt


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Research Findings- LSVT

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LSVT eila ppt

  1. 1. Changes in Vocal Loudness Following LSVT <ul><li>Ramig, Sapir, and Countryman (2001) compared changes in vocal loudness following LSVT </li></ul><ul><li>Purpose - investigate whether extraneous factors are responsible for the improvement in the voice and speech of individuals who received LSVT – expected fluctuation of voice symptoms with the course of PD, and familiarity with testing procedures </li></ul><ul><li>Increased loudness = a positive treatment outcome </li></ul><ul><li>Hypothesis- if increased intensity is measured in patients who received LSVT, but is not in the untreated groups, then this change is more likely to be treatment-related. </li></ul>
  2. 2. Participants, Study design and method <ul><li>3 groups: </li></ul><ul><li>14 participants with PD-received LSVT </li></ul><ul><li>14 participants with PD –no treatmt </li></ul><ul><li>14 neurologically normal (NN) </li></ul><ul><li>treatment protocol in the study followed the known LSVT protocol </li></ul><ul><li>SPL of four different speech tasks were recorded: </li></ul><ul><li>(1) six repetitions of sustained phonation of the vowel “ah” </li></ul><ul><li> (2) reading of the “Rainbow Passage” </li></ul><ul><li>(3) a free-topic monologue </li></ul><ul><li>(4) description of the “Cookie Theft Picture” </li></ul><ul><li>Three recording intervals: before the PD group commenced therapy, immediately after the treatment period, and six months after the treatment for the PD group had ended. </li></ul>
  3. 3. Results and Conclusion <ul><li>Results indicated a significant increase in SPL from baseline to post-treatment measurements in the PD group that received LSVT. </li></ul><ul><li>When compared to the NN group, participants in the LSVT group demonstrated post-treatment a significantly higher SPL for the sustained vowel and the reading tasks. </li></ul><ul><li>Significantly higher SPL for all tasks six months post treatment for the LSVT group when compared to the PD group that did not received treatment. </li></ul><ul><li>The participants in the two untreated groups maintained a relatively stable SPL throughout the measurement intervals. </li></ul><ul><li>Conclusion- the significant increase in SPL for the LSVT group, together with the relatively stable SPL that was measured for the untreated participants, indicate that the increase in SPL is treatment-specific </li></ul>
  4. 4. Changes in Vowel Articulation Following LSVT <ul><li>Sapir, Spielman, Ramig, Story, and Fox (2007) investigated changes in vowel articulation following LSVT </li></ul><ul><li>Purpose- investigate the relationship between improvement in speech clarity and intelligibility following LSVT and articulatory movements. </li></ul><ul><li>Hypothesis- LSVT influences the movement of the articulators which leads to improvement in speech clarity and intelligibility </li></ul><ul><li>The researchers measured: </li></ul><ul><ul><li>Changes in the first and second formants (F1 and F2) of vowels- have great importance in the perception of vowels </li></ul></ul><ul><ul><li>The ratio F2i/F2u as a measurement of changes in articulatory function </li></ul></ul><ul><ul><li>Changes in vowel triangle area (VTA) - vowels in dysarthric speech tend to become centralized due to limited movement of the articulators, individuals with PD will show a greater VTA post-LSVT. </li></ul></ul><ul><ul><li>perceptual component- compared listeners’ ratings of “vowel goodness” before and after LSVT- the quality of the vowels produced by PD participants would be considered as poor pre-treatment, and so improvement in vowel articulation post-LSVT will result in the listener perceiving vowel productions following LSVT as better. </li></ul></ul>
  5. 5. Participants, Research Design and Method <ul><li>3 groups: </li></ul><ul><li>14 participants with PD-received LSVT </li></ul><ul><li>15 participants with PD –no treatment </li></ul><ul><li>14 neurologically normal (NN) </li></ul><ul><li>Treatment protocol in the study followed the known LSVT protocol </li></ul><ul><li>The researchers measured vocal on three different days before the onset of treatment for the treatment group, and on two different days immediately following the termination of LSVT. </li></ul><ul><li>participants read 3 phrases and the vowel in one word from each of these phrases (‘key’, ‘stew’, and ‘Bobby’) was used for analysis : /i/, /u/, and /a/. </li></ul>
  6. 6. Results and Conclusion <ul><li>Results indicated changes in the means F2u, F2i/F2u, SPLi, SPLu, and SPLa only in the treatment group </li></ul><ul><li>These changes included increase in vocal SPL, and a change in the values of F2u and F2i/F2u towards the values of the healthy participants </li></ul><ul><li>Perceptual vowel ratings - the post treatment vowels that were produced by the LSVT group were rated as better than those produced pretreatment </li></ul><ul><li>A correlation between changes in “vowel goodness” ratings and changes in the acoustic variables before and after treatment= improvement in SPL and change toward normal values of vowel acoustics correlated with post treatment vowels being rated as better. </li></ul><ul><li>Conclusion- in the lack of change in the control group and the positive changes in the treatment group, the effects observed in the treatment group are treatment-specific. </li></ul><ul><li>Explaining the results- deficits in facial muscle activity were minimized as a result of LSVT and effected the change in F2u values. The authors also suggest that LSVT could have improved the range of tongue movement, which was exhibited by F2u changes. </li></ul>