Pharmaceutical and neurosurgical treatments reliably ameliorate the cardinal motor symptoms in PD but, they often yield inconsistent outcomes for speech and voice disorders, with some studies showing exacerbation of pre-treatment deficits. Therefore, it is crucial to develop and optimize novel approaches that could simultaneously improve speech and voice deficits in PD and facilitate existing behavioral interventions. This project will investigate the immediate and short-term effects of multiple sessions of HD-tDCS over the left SMA on speech and voice deficits in PD.
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Voice loudness measures
Timeframe: Acoustic measures related to voice loudness will be measured at baseline, immediately after the last session of stimulation, one week and one month after the las stimulation session.
Fundamental frequency measures
Timeframe: Fundamental frequency (F0), jitter (Cycle-to-cycle voice F0 perturbation) and harmonic to noise ration will be calculated for each participant.
Accuracy of syllable repetition
Timeframe: Accuracy rate for syllable repetition will be measured at baseline, immediately after the last session of stimulation, one week and one month after the las stimulation session.
Speech rate
Timeframe: Speech rate will be measured at baseline, immediately after the last session of stimulation, one week and one month after the las stimulation session.
Speech rate stability
Timeframe: Speech rate stability will be measured at baseline, immediately after the last session of stimulation, one week and one month after the las stimulation session.