Fig. 1.

The connectivity model space to be used in the MEG and ECoG datasets. A) The source loci in bilateral primary auditory cortex (A1), STG and IFG, based on Garrido, Kilner, Kiebel, et al., (2009). B) The full model from Phillips et al. (2015) which provided an optimal parsimonious fit of the data. C) The subset of models studied here as intracranial electrodes have limited coverage of sources in the full model. The models are illustrated in order of complexity, beginning with a simple forward (bottom-up) connection between the two nodes and progress by adding modulated connections (dashed connections), backward (top-down) connections and the prediction inputs acting on the highest node. D) We defined four families of models, with variation across families shown in red. All MEG models include sensory input to A1 with intrinsic A1 connectivity and bidirectional connectivity between A1 and STG. Model family L12 includes the 12 models in C) for the left hemisphere whilst keeping full connectivity on the right hemisphere. Model family L12-RInput repeats L12 models and also includes a right frontal expectancy input. R12 and R12-LInput families include homologous models on the opposite hemispheres.