Highly accurate retinotopic maps of the physiological blind spot in human visual cortex |
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| Authors: | Poutasi W. B. Urale Alexander M. Puckett Ashley York Derek Arnold D. Samuel Schwarzkopf |
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| Affiliation: | 1. School of Optometry & Vision Science, University of Auckland, Auckland New Zealand ; 2. School of Psychology, University of Queensland, Brisbane Queensland, Australia ; 3. Queensland Brain Institute, University of Queensland, Brisbane Queensland, Australia ; 4. Experimental Psychology, University College London, London United Kingdom |
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| Abstract: | ![]()
The physiological blind spot is a naturally occurring scotoma corresponding with the optic disc in the retina of each eye. Even during monocular viewing, observers are usually oblivious to the scotoma, in part because the visual system extrapolates information from the surrounding area. Unfortunately, studying this visual field region with neuroimaging has proven difficult, as it occupies only a small part of retinotopic cortex. Here, we used functional magnetic resonance imaging and a novel data‐driven method for mapping the retinotopic organization in and around the blind spot representation in V1. Our approach allowed for highly accurate reconstructions of the extent of an observer’s blind spot, and out‐performed conventional model‐based analyses. This method opens exciting opportunities to study the plasticity of receptive fields after visual field loss, and our data add to evidence suggesting that the neural circuitry responsible for impressions of perceptual completion across the physiological blind spot most likely involves regions of extrastriate cortex—beyond V1. |
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| Keywords: | blind spot population receptive fields primary visual cortex retinotopy reverse correlation scotoma vision loss |
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