Meaningful feedback to occluded V1 is improved by increasing local information in the surround

Revina, Yulia; Petro, Lucy S.; Denk-Florea, Cristina; Blum, Sebastian; Kriegeskorte, Nikolaus; Muckli, Lars

doi:10.1167/16.12.572

Journal of Vision

2016

DOI: 10.1167/16.12.572

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Meaningful feedback to occluded V1 is improved by increasing local information in the surround

Yulia Revina

Lucy S. Petro

Cristina Denk-Florea

et al.

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“…We have previously demonstrated (unpublished observations, Revina et al, 2016) that this feedback and 450 feedforward similarity depends on the amount of surrounding scene information. This is because removing 451 the scene surround outside the feedforward quadrant removes the contextual surrounding feedback, which 452 drives this similarity effect.…”

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Cortical feedback signals generalise across different spatial frequencies of feedforward inputs

2018

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Primary visual cortex (V1) has small receptive fields and processes feedforward information at a fine-18 grained spatial scale, whereas higher visual areas have larger, spatially invariant receptive fields. Therefore, 19 feedback could provide coarse information about the global scene structure or alternatively recover fine-20 grained structure by targeting small receptive fields in V1. We tested if feedback signals generalise across 21 different spatial frequencies of feedforward inputs, or if they are tuned to the spatial scale of the visual 22 scene. Using a partial occlusion paradigm, functional magnetic resonance imaging (fMRI) and multivoxel 23 pattern analysis (MVPA) we investigated whether feedback to V1 contains coarse or fine-grained 24 information by manipulating the spatial frequency of the scene surround outside an occluded image portion. 25We show that feedback transmits both coarse and fine-grained information as it carries information about 26 both low (LSF) and high spatial frequencies (HSF

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confidence: 91%

Cortical feedback signals generalise across different spatial frequencies of feedforward inputs

2018

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Meaningful feedback to occluded V1 is improved by increasing local information in the surround

Cited by 1 publication

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Cortical feedback signals generalise across different spatial frequencies of feedforward inputs

Cortical feedback signals generalise across different spatial frequencies of feedforward inputs

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