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Motor-Learning-Based Adjustment of Ambulatory Feedback on Vocal Loudness for Patients With Parkinson's Disease

  • Joakim Gustafsson
    Correspondence
    Address correspondence and reprint requests to Joakim Gustafsson, Division of Speech and Language Pathology, B69, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Huddinge, 141 86 Stockholm, Sweden.
    Affiliations
    Division of Speech and Language Pathology, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden

    Department of Speech and Language Pathology, Karolinska University Hospital, Stockholm, Sweden
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  • Sten Ternström
    Affiliations
    Department of Speech, Music and Hearing, School of Computer Science and Communication, KTH Royal Institute of Technology, Stockholm, Sweden
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  • Maria Södersten
    Affiliations
    Division of Speech and Language Pathology, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden

    Department of Speech and Language Pathology, Karolinska University Hospital, Stockholm, Sweden
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  • Ellika Schalling
    Affiliations
    Division of Speech and Language Pathology, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden

    Department of Speech and Language Pathology, Karolinska University Hospital, Stockholm, Sweden
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      Summary

      Objectives

      To investigate how the direct biofeedback on vocal loudness administered with a portable voice accumulator (VoxLog) should be configured, to facilitate an optimal learning outcome for individuals with Parkinson's disease (PD), on the basis of principles of motor learning.

      Study Design

      Methodologic development in an experimental study.

      Methods

      The portable voice accumulator VoxLog was worn by 20 participants with PD during habitual speech during semistructured conversations. Six different biofeedback configurations were used, in random order, to study which configuration resulted in a feedback frequency closest to 20% as recommended on the basis of previous studies.

      Results

      Activation of feedback when the wearer speaks below a threshold level of 3 dB below the speaker's mean voice sound level in habitual speech combined with an activation time of 500 ms resulted in a mean feedback frequency of 21.2%.

      Conclusions

      Settings regarding threshold and activation time based on the results from this study are recommended to achieve an optimal learning outcome when administering biofeedback on vocal loudness for individuals with PD using portable voice accumulators.

      Key Words

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