Table 3.
Changes of tremor intensity (i.e., power of EMG signals) during the audio-visual task.
| Patient | Muscle | fPEAK(fAVG) | Pre-task (0–90 s) | A-V200 task (90 s–EoT) | Post-task early (EoT–400 s) | Post-task late (400–500 s) |
|---|---|---|---|---|---|---|
| PPEAK(PAVG) | PPEAK(PAVG) | PPEAK(PAVG) | PPEAK(PAVG) | |||
| 1 | R-flex | 4.8 (4.6) | 83 (50) | 4250 (1118) | 1975 (296) | – |
| 2 | R-flex | 4.9 (4.9) | – | 14,130 (1405) | 9834 (2704) | 1703 (376) |
| 3 | L-ext | 5.8 (5.8) | 380 (181) | 1755 (912) | 349 (260) | 265 (70) |
| 4 | L-ext | 4.2 (4.2) | – | 800 (296) | 266 (100) | – |
| 5 | R-ext | 4.9 (5.1) | 2686 (819) | 8022 (2240) | 3686 (501) | – |
| 6 | L-opp | 3.9 (3.9) | – | 14,759 (4286) | – | – |
| 7 | L-flex | 4.9 (4.9) | – | 9563 (2937) | 4314 (1552) | – |
| 8 | L-flex | 4.2 (4.2) | – | 7393 (838) | – | – |
| 9 | R-opp | 4.3 (4.2) | 1981 (719) | 8806 (2963) | 1222 (231) | – |
| 10 | L-ext | 5.5 (5.3) | – | 1244 (86) | 145 (35) | 109 (41) |
| 11 | L-opp | 3.9 (3.9) | – | 2907 (267) | – | – |
| 12 | R-opp | 3.5 (3.5) | – | 135 (56) | – | – |
Pre-task refers to a period of 90 s without stimuli preceding the audio-visual task (A-V200). Post-task early refers to the first time period without stimuli after the task end (from End-of-Task (EoT) to 400 s counting from the start of the EMG recording); post-task late refers to the last part of the period without stimuli (from 400 to the end of EMG recording). We listed only the activity of the most-affected muscle. Tremor frequency, when tremor was present, did not change throughout the task. The intensity of tremor significantly increased during the task in all subjects.
fPEAK = peak frequency; fAVG = average frequency; PPEAK = tremor power peak; PAVG = tremor power average; “–“ refers to absence of tremor activity at EMG.
Note that given the randomized presentation of the visual and auditory stimuli, the EoT time differed among subjects (ranging from 127 to 198 s).