We subjectively perceive our visual field with high fidelity, yet large peripheral distortions can go unnoticed and peripheral objects can be difficult to identify (crowding). A recent paper proposed a model of the mid-level ventral visual stream in which neural responses were averaged over an area of space that increased as a function of eccentricity (scaling). Human participants could not discriminate synthesised model images from each other (they were metamers) when scaling was about half the retinal eccentricity. This result implicated ventral visual area V2 and approximated “Bouma’s Law” of crowding. It has subsequently been interpreted as a link between crowding zones, receptive field scaling, and our rich perceptual experience. However, participants in this experiment never saw the original images. We find that participants can easily discriminate real and model-generated images at V2 scaling. Lower scale factors than even V1 receptive fields may be required to generate metamers. Efficiently explaining why scenes look as they do may require incorporating segmentation processes and global organisational constraints in addition to local pooling.
Image content is more important than Bouma’s Law for scene metamers
Thomas S. A. Wallis,Christina M. Funke,Alexander S. Ecker,Leon A. Gatys,Felix Wichmann,M. Bethge
Published 2018 in bioRxiv
ABSTRACT
PUBLICATION RECORD
- Publication year
2018
- Venue
bioRxiv
- Publication date
2018-07-30
- Fields of study
Biology, Medicine, Computer Science, Psychology
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- bouma's law
A psychophysical rule linking the spatial extent of crowding to retinal eccentricity.
Aliases: Bouma law
- global organisational constraints
Scene-level structural regularities that constrain how visual elements are arranged and interpreted.
Aliases: global organization constraints
- local pooling
The aggregation of responses from a limited neighborhood of visual input into a single summary representation.
Aliases: pooling
- real and model-generated images
The comparison between original scene images and images synthesized by the metamer model in the experiment.
Aliases: real images and model-generated images
- scene metamers
Synthesized images intended to match the perceptual appearance of a source scene under a visual model.
Aliases: metamers
- segmentation processes
Processes that partition a visual scene into distinct objects or regions.
Aliases: segmentation
- v1 receptive fields
The spatial regions over which neurons in primary visual cortex integrate visual input.
Aliases: primary visual cortex receptive fields
- v2 scaling
The model regime in which pooling area increases with retinal eccentricity at a rate associated with ventral visual area V2.
Aliases: scaling
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