Table 1.
List of the 33 models considered to describe the effect of the three joint angles Ak, k = 1, 2, 3 on the firing rates of neurons. The notation s(.) is a spline basis with 4 non-parametric degrees of freedom. The notation s(Aj) * s(Ak) means that the main effects s(Aj), s(Ak), and their interaction s(Aj): s(Ak) are included in the model.
| Index | Model description | Variations |
|---|---|---|
| 1 | gi = β0i | |
| 2–4 | gi = β0i + s(Aj) | j = 1, 2, 3 |
| 5–6 | gi = β0i + s(Aj) + s(Ak) | (j, k) = (1, 2), (2, 3) |
| 7–8 | gi = β0i + s(Aj) * s(Ak) | (j, k) = (1, 2), (2, 3) |
| 9–11 | gi = β0i + s(Ȧj) | j = 1, 2, 3 |
| 12–14 | gi = β0i + s(Aj) * s(Ȧj) | j = 1, 2, 3 |
| 15–18 | gi = β0i + s(Aj) * s(Ȧj) + s(Ak) | (j, k) = (1, 2), (2, 1), (2, 3), (3, 2) |
| 19–22 | gi = β0i + s(Aj) * s(Ak) + s(Ȧk) | (j, k) = (1, 2), (2, 1), (2, 3), (3, 2) |
| 23–25 | gi = β0i + s(Aj) + s(Ȧj) | j = 1, 2, 3 |
| 26–27 | gi = β0i + s(Aj) * s(Ȧj) + s(Ak) * s(Ȧk) | (j, k) = (1, 2), (2, 3) |
| 28–31 | gi = β0i + s(Aj) + s(Ȧj) + s(Ak) | (j, k) = (1, 2), (2, 1), (2, 3), (3, 2) |
| 32–33 | gi = β0i + s(Aj) * s(Ak) + s(Ȧj) + s(Ȧk) | (j, k) = (1, 2), (2, 3) |