Spatial frequency processing in scene-selective cortical regions

NeuroImage
Louise KauffmannC Peyrin

Abstract

Visual analysis begins with the parallel extraction of different attributes at different spatial frequencies. Low spatial frequencies (LSF) convey coarse information and are characterized by high luminance contrast, while high spatial frequencies (HSF) convey fine details and are characterized by low luminance contrast. In the present fMRI study, we examined how scene-selective regions-the parahippocampal place area (PPA), the retrosplenial cortex (RSC) and the occipital place area (OPA)-responded to spatial frequencies when contrast was either equalized or not equalized across spatial frequencies. Participants performed a categorization task on LSF, HSF and non-filtered scenes belonging to two different categories (indoors and outdoors). We either left contrast across scenes untouched, or equalized it using a root-mean-square contrast normalization. We found that when contrast remained unmodified, LSF and NF scenes elicited greater activation than HSF scenes in the PPA. However, when contrast was equalized across spatial frequencies, the PPA was selective to HFS. This suggests that PPA activity relies on an interaction between spatial frequency and contrast in scenes. In the RSC, LSF and NF elicited greater response than HSF s...Continue Reading

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Citations

Mar 5, 2016·NeuroImage·Frederik S KampsDaniel D Dilks
Sep 29, 2015·Social Cognitive and Affective Neuroscience·Yuqi You, Wen Li
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Jun 3, 2020·Brain Sciences·François OrliacNicolas Poirel
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Nov 19, 2019·Frontiers in Neural Circuits·Stephen RamanoëlAngelo Arleo
Nov 17, 2020·Frontiers in Human Neuroscience·Kamil VlcekPetr Marusic

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