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  • Position
  • Assistant professor Cognitive Psychology
  • Institute
  • Vrije Universiteit

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The Visual System: Retinotopic Maps and Population Receptive Fields

With fMRI, we measure thousands of neurons in each voxel. Because neurons with similar receptive fields are close together on the retinotopic map, each population of neurons measured in a single fMRI voxel will have similar receptive fields. This means that it is possible to chart, for each voxel, its population receptive field, or pRF, i.e. the region of visual space that the voxel’s neural tissue analyses (see figure, right). We estimate these population receptive fields to thoroughly understand how the visual system encodes information. Recent studies using this novel encoding-model approach emphasize the flexibility of information encoding in the retinotopic maps, changing due to things such as attention, etc. Thus, they bring us closer to a low-level understanding of the neuronal underpinnings of cognitive phenomena.