Table 2. Summary of the effect size, cluster size, and MNI coordinates of brain locations where the highest (voxelwise-corrected P<0.05) increase in absolute CBF and significant differences in rCBF were observed.
| Structure | t-value | No. of voxels 2 × 2 × 2 mm3 | x | y | z |
|---|---|---|---|---|---|
| CBFMorphine (post−pre)>CBFPlacebo (post−pre) | |||||
| Cerebellum (IX, tonsil) | 5.74 | 3041 | 50 | 36 | 19 |
| Pregenual ACC | 5.31 | 1534 | 52 | 78 | 45 |
| Right frontal operculum | 5.37 | 529 | 26 | 73 | 42 |
| Left cerebellum crus | 5.03 | 133 | 58 | 21 | 15 |
| Right temporal pole | 5.12 | 119 | 28 | 65 | 16 |
| Brainstem, pons | 4.96 | 159 | 47 | 51 | 30 |
| CBFAlcohol (post−pre)>CBFPlacebo (post−pre) | |||||
| Left precentral | 4.75 | 100 | 63 | 55 | 69 |
| Left fusiform | 4.89 | 75 | 69 | 51 | 22 |
| Right hippocampus | 4.74 | 72 | 30 | 42 | 36 |
| Left premotor | 4.94 | 52 | 57 | 62 | 70 |
| Left cingulate cortex | 4.70 | 50 | 52 | 52 | 60 |
| Left occipital pole | 4.82 | 45 | 61 | 15 | 35 |
| Right premotor | 4.60 | 36 | 39 | 63 | 67 |
| Left prim. somatosensory | 4.60 | 15 | 73 | 59 | 58 |
| rCBFMorphine (post−pre)>rCBFAlcohol (post−pre) | |||||
| Cerebellum | 6.77 | 11473 | 29 | 25 | 11 |
| ACC | 4.53 | 582 | 47 | 83 | 39 |
| rCBFMorphine (post−pre)<rCBFAlcohol (post−pre) | |||||
| Left primary motor, somatosensory, and lateral occipital | 5.07 | 2141 | 72 | 62 | 44 |
| Left occipitotemporal | 5.20 | 1257 | 67 | 32 | 37 |
| Right hippocampus | 5.99 | 1085 | 29 | 53 | 27 |
| Left hippocampus | 5.07 | 619 | 63 | 45 | 30 |
| Left putamen | 4.14 | 83 | 59 | 61 | 40 |
| Left superior temporal | 4.20 | 69 | 73 | 49 | 34 |
| Right lateral occipital | 4.02 | 62 | 22 | 31 | 48 |
ACC, anterior cingulate cortex; CBF, cerebral blood flow; MNI, Montreal Neurological Institute; rCBF, relative CBF.