Seven Myths on Crowding and Peripheral Vision

@article{Strasburger2020SevenMO,
  title={Seven Myths on Crowding and Peripheral Vision},
  author={Hans Strasburger},
  journal={i-Perception},
  year={2020},
  volume={11}
}
Crowding has become a hot topic in vision research, and some fundamentals are now widely agreed upon. For the classical crowding task, one would likely agree with the following statements. (1) Bouma’s law can be stated, succinctly and unequivocally, as saying that critical distance for crowding is about half the target’s eccentricity. (2) Crowding is predominantly a peripheral phenomenon. (3) Peripheral vision extends to at most 90° eccentricity. (4) Resolution threshold (the minimal angle of… 
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References

SHOWING 1-10 OF 282 REFERENCES
Crowding—An essential bottleneck for object recognition: A mini-review
  • D. Levi
  • Psychology
    Vision Research
  • 2008
Crowding is directed to the fovea and preserves only feature contrast.
TLDR
Crowding appears to spare only the most salient peripheral information, which supports the hypothesis that crowding is caused by limitations of attentional resolution.
Crowding is size and eccentricity dependent.
TLDR
It is shown that the non-foveal data in all three tasks can be characterized as shifted versions of the same psychometric function such that different sections of the function characterize data at each eccentricity, suggesting that the distance-dependent interference increases with eccentricity.
On the generality of crowding: visual crowding in size, saturation, and hue compared to orientation.
TLDR
Interestingly, although critical spacings are highly comparable, crowding magnitude differs across features: Size crowding is almost as strong as orientation crowding, whereas the effect is much weaker for saturation and hue.
Evolving the Keys to Visual Crowding
TLDR
It is concluded that Bouma’s rule does not necessarily hold in densely cluttered displays and instead, a nearest-neighbor segmentation rule provides a better account.
Crowding and surround suppression: not to be confused.
TLDR
The results demonstrate that surround suppression and crowding are indeed two distinct phenomena, and used this characteristic anisotropy to show that a popular crowding paradigm in which target contrast is varied to measure crowding is confounding it with surround suppression.
Radial-tangential anisotropy of crowding in the early visual areas.
TLDR
Functional magnetic resonance imaging was used to measure the change in mean blood oxygenation level-dependent (BOLD) response due to the addition of a middle letter between a pair of radially or tangentially arranged flankers and found that the BOLD signal evoked by the middle letter depended on the arrangement of the flankers.
Crowding: a cortical constraint on object recognition
  • D. Pelli
  • Biology
    Current Opinion in Neurobiology
  • 2008
The shape and size of crowding for moving targets
Foveal Crowding Resolved
TLDR
Adapt optics is used to overcome ocular aberrations and high-resolution stimuli are employed to precisely characterize foveal lateral interactions with high-contrast letters flanked by letters to reveal a recovery effect with proximal flankers.
...
...