Results of multiple regression analyses performed to test whether the BOLD signal changes with age were a consequence of structural and performance differences
| β | t | p | |
|---|---|---|---|
| [−30, 24, 0] IFG SI–SO parameter estimate | |||
| R2 = 0.220 | |||
| Gray matter adjusted volume IFG | 0.233 | 0.87 | 0.390 |
| White matter adjusted volume IFG | 0.253 | 1.13 | 0.267 |
| SI stay–SO stay RT | −0.047 | −0.29 | 0.774 |
| SI stay–SO stay accuracy | 0.106 | 0.66 | 0.512 |
| Age | −0.378 | −1.70 | 0.099 |
| [36, 45, 30] Superior RLPFC SOSI–Color switch parameter estimate | |||
| R2 = 0.135 | |||
| Gray matter adjusted volume RLPFC | −0.206 | −0.83 | 0.412 |
| White matter adjusted volume RLPFC | 0.038 | 0.21 | 0.832 |
| SOSI switch–Color switch RT | −0.030 | −0.15 | 0.880 |
| SOSI switch–Color switch accuracy | 0.075 | 0.42 | 0.681 |
| Age | −0.466 | −1.99 | 0.055 |
Measures of performance, adjusted volumes of gray and white matter, and age were entered together. The results showed that the association between BOLD and age remained marginally significant when taking into account structural and performance parameters.