Table 1.
Brain regions significantly correlated with digit span (all in the left hemisphere)
| Analysis 1 | Co-ordinates (peak voxels) |
Z-score | ||
|---|---|---|---|---|
| Digit span | x | y | z | |
| Posterior | ||||
| Superior temporal gyrus (posterior) | –66 | –32 | 6 | Inf |
| Heschl's gyrus (A1) | –54 | –20 | 14 | 7.84 |
| Superior temporal gyrus (anterior) | –58 | 0 | –2 | 7.67 |
| Superior temporal sulcus (posterior) | –60 | –44 | 6 | 7.19 |
| Middle temporal gyrus | –64 | –46 | –8 | 6.97 |
| Mid | ||||
| Posterior insula (long insula gyrus) | –38 | –10 | 4 | 7.83 |
| Anterior insula (short insula gyrus) | –36 | 16 | –8 | 6.56 |
| Anterior | ||||
| Inferior frontal gyrus (ventral pre-motor) | –62 | 6 | 18 | 6.36 |
| Inferior frontal gyrus (pars orbitalis) | –50 | 42 | –10 | 6.01 |
| Inferior frontal gyrus (pars triangularis) | –48 | 36 | 2 | 5.86 |
| Sub-cortical | ||||
| Body of caudate | –20 | –28 | 18 | Inf |
| Head of caudate | –14 | 16 | 6 | 7.46 |
| Analysis 2 | ||||
| Superior temporal gyrus (posterior) | –66 | –32 | 4 | 5.26 |
| Analysis 3 | ||||
| Superior temporal gyrus (posterior) | –56 | –26 | 12 | 5.15 |
Coordinates are in MNI space. Z-scores are significant at P < 0.05 after correction for multiple comparisons across the whole brain. The location and extent of these activations are illustrated in Fig. 3.