Table 4.

Neural correlates of facial behavior across trials.

				MNI coordinate
All trials	Side	Cluster size	T-score	x	y	z
Total facial behavior (all AUs combined)
Precentral Gyrus	L	128	3.32	−57	−2	32
Precentral Gyrus	R	37	2.99	58	−2	39
AU 1
Precentral gyrus	L	92	3.49	−58	12	21
Precentral gyrus	R	72	3.24	56	−2	22
Precentral gyrus	L	11	2.98	−54	8	3
AU 2
Precentral gyrus	L	225	3.41	−56	8	16
Precentral gyrus	R	14	2.90	54	−3	21
AU 4
Precentral gyrus	L	57	2.91	−60	3	30
AU 6/7
Precentral gyrus	L	100	3.13	−62	0	34
Precentral gyrus	R	108	3.12	54	−3	40
Precentral gyrus	L	50	3.04	−44	−14	52
AU 12
Precentral gyrus*	R	208	4.09	63	−3	30
Precentral gyrus	L	18	2.85	−56	−3	30

Structural neuroimaging analyses revealed that greater total facial behavior and greater single AU activity across trials (controlling for age, sex, and total intracranial volume) correlated with larger gray matter volume in the primary motor cortex. MNI coordinates are provided for the maximum T-score for the cluster (P < .005, uncorrected, k > 10).

^*Denotes significance at p_FWE < 0.05.