Table 3.
Neural correlates of total brow furrowing and total smiling across trials.
| MNI coordinates | ||||||
|---|---|---|---|---|---|---|
| All trials | Side | Cluster size | T-score | x | y | z |
| AUs 4 and 6/7 | ||||||
| Precentral gyrus | L | 116 | 3.52 | −62 | 2 | 33 |
| Precentral gyrus | R | 54 | 3.06 | 56 | −2 | 38 |
| AUs 12 and 6/7 | ||||||
| Precentral gyrus | R | 222 | 3.36 | 57 | −3 | 38 |
| Precentral gyrus | L | 108 | 3.21 | −57 | −2 | 32 |
| Precentral gyrus | L | 22 | 2.89 | −44 | −14 | 52 |
Structural neuroimaging analyses revealed regions in which larger gray matter volume was associated with greater total brow furrowing (AUs 4 and 6/7) and greater total smiling (AUs 12 and 6/7) across trials (controlling for age, sex, and total intracranial volume). MNI coordinates provided for each cluster’s maximum T-score (P < .005, uncorrected, k > 10).