Interactive per-participant cortical surface viewers
In this study, participants estimated the number of dots in briefly presented clouds, while the range of presented numerosities switched between a narrow and a wide range across blocks. Numerosity receptive-field models were fitted to 3T fMRI responses, yielding a preferred numerosity (μ) for every point on each participant's cortical surface, separately for the two range conditions.
Each viewer below shows, on the participant's own (inflatable) cortical surface: the preferred numerosity (μ, nipy_spectral colormap) in the narrow and wide conditions, the tuning width (σ in log space, viridis colormap) and the cross-validated explained variance of the encoding model (cvR², plasma colormap). Three models are included: model 3 (receptive-field shift fitted freely per voxel, whole brain), model 31 (the paper's winning model, with fixed tuning-width scaling) and model 14 (tuning width free per voxel); models 31 and 14 were fitted only within the right numerosity parietal cortex (NPCr) and are shown only there. The white contour on every map marks NPCr. Vertices are colored where cvR² > 0 and 5 ≤ μ ≤ 25. A collapsible panel in each viewer shows an interactive per-voxel scatter of μ and σ (narrow vs wide) for all three models; selecting a model or parameter there also switches the brain map shown.
In a viewer, rotate with the mouse, press i/f to inflate or flatten the surface (“flat” here means fully inflated, not a cut-open flatmap), and press +/− to step through the maps. Viewers are built with pycortex.