Table 4.
Results for test‐retest and intra‐trial reliability
| Experimental task | Test‐retest reliability and agreementa | Intra‐trial reliability and agreement: First 5 s vs. last 5 s of trial in controlsb | ||
|---|---|---|---|---|
| ICCA,1 | Bias (limits of agreement) | ICCA,1 | Bias (limits of agreement) | |
| Repetitive finger tapping (RFT) | ||||
| Velocity (v) | ||||
| v mean, cm.s−1 | 0.72 | 1.1 (−2.1, 4.3) | 0.71 | 0.5 (−0.8, 1.9) |
| Δv, cm.s−2 | 0.17 | −0.01 (−0.3, 0.3) | — | — |
| Frequency (f) | ||||
| f mean, cycles.s−1 | 0.12 | 0.4 (−0.1, 0.8) | 0.91 | 0.08 (−0.03, 0.19) |
| Δf, cycles.s−2 | 0.19 | −0.02 (−0.05, 0.01) | — | — |
| Amplitude (A) | ||||
| A mean, cm | 0.40 | −0.08 (−1.0, 0.9) | 0.48 | −0.02 (−0.7, 0.7) |
| ΔA, cm.s−1 | −0.01 | 0.05 (−0.03, 0.12) | — | — |
| Interruptions of rhythm | ||||
| Hesitations, no.cycle−1 | 0.18 | −0.4 (−1.0, 0.1) | 0.42 | −0.04 (−0.3, 0.2) |
| Halts, % of time | 0.90 | −3.1 (−8.6, 2.3) | — | — |
| Alternating hand movements (AHM) | ||||
| Velocity (v) | ||||
| v mean, cm.s−1 | 0.22 | −7.8 (−30.0, 14.3) | 0.76 | 4.8 (−4.2, 13.8) |
| Δv, cm.s−2 | 0.17 | −0.8 (−2.3, 0.7) | — | — |
| Frequency (f) | ||||
| f mean, cycles.s−1 | 0.59 | 0.1 (−0.1, 0.4) | 0.81 | −0.004 (−0.1, 0.1) |
| Δf, cycles.s−2 | −0.01 | 0.01 (−0.02, 0.04) | — | — |
| Amplitude (A) | ||||
| A mean, cm | 0.25 | −4.2 (−9.8, 1.4) | 0.82 | −3.8 (−6.5, −1.0) |
| ΔA, cm.s−1 | 0.07 | −0.02 (−0.6, 0.6) | — | — |
| Interruptions of rhythm | ||||
| Hesitations, no.cycle−1 | 0.11 | −0.2 (−1.0, 0.5) | 0.41 | −0.7 (−1.6, 0.2) |
| Halts, % of time | 0.21 | −1.1 (−3.3, 1.1) | — | −1.6 (−3.9, 0.6) |
Δ, change; ICCA,1, intraclass correlation coefficient for absolute agreement.
a
Based on N = 21 for RFT and N = 20 for AHM.
b
Based on N = 53 for RFT and AHM. Reported variables were assumed to be constant over the time course of a trial in controls. Variables Δv, Δf, and ΔA were excluded from this analysis, because the 5‐second segments were considered too short to quantify changes in velocity, frequency, and amplitude.