Fig. 1.

All models contained 4 neuronal sources (far left). A, the left HG [MNI coordinates (−42, − 22, 7)]; B, the right HG (46, − 14, 8]); C, the left STG (−61, − 32, 8); D, the right STG (59, − 25, 8). The 4 models used in the DCM analysis were, from left-to-right: 1) the initial model derived from Garrido et al. (15); 2) left-sided model; 3) right-sided model; 4) fully connected model. Model 4 explained the observed data (comprising 3 deviant ERFs) better than the other models, across both stimulus classes. Connections between regions that are not allowed to be modulated by differences in auditory stimuli (standards and deviants) are dashed (gray); this includes inputs into both primary auditory cortices (dashed black). Connections between regions that are allowed to vary between standard and deviant stimuli are shown as sold black lines. This characteristic differentiates the 4 basic models.