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. 2022 Jan 19;12:1019. doi: 10.1038/s41598-022-05128-8

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© The Author(s) 2022

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(a) Stimulus waveform. (b) Average waveform brainstem response to [da] in individuals with PD (red) and age- and gender-matched controls (black). The pre-stimulus period (− 10 to 0 ms) and the response period (0 to 60 ms) are shown. (c) Bar graph demonstrating between-group differences in RMS amplitude for the pre-stimulus and response periods. The error and shaded error bars represent the standard error. Note: *p < 0.01.