Dr Benjamin de Haas and Sam recently published a study in Scientific Reports using illusory contour and amodal completion (occlusion) stimuli to map population receptive fields in early visual cortex. The signals are very weak but they correspond spatially very well to normal retinotopic maps. We suspect that what these experiments were really mapping is spatially selective attention cued to the position of the mapping stimuli. We thank Rebecca Tyrwhitt-Drake who did the original experiments for her student research project.
de Haas B, & Schwarzkopf DS (2018). Spatially selective responses to Kanizsa and occlusion stimuli in human visual cortex. Scientific Reports 8: 611.