Fig. 3.

Fixed versus mixed RSA. (A) Fixed RSA: a brain RDM is compared to a model RDM which is constructed from the model features. The model features are extracted from the images and the RDM is constructed using the pairwise dissimilarities between the model features. (B) Mixed RSA: a brain RDM is compared to a model RDM which is constructed from mixed model features obtained via receptive field modelling (see also Fig. 2). There is first a training phase in which the receptive field models are estimated for each voxel (similar to Kay et al. (2008)). In the testing phase, using the learned receptive field models, voxel responses to new stimuli are predicted. Then the RDM of the predicted voxel responses is compared with the RDM of the actual measured brain (voxel) responses.