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The Measurement and Treatment of Suppression in Amblyopia
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Characterizing surround suppression with dynamic natural scenes.

Merve Kiniklioglu1,2, Daniel Kaiser1,3,4,5

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Contextual modulation in natural vision is influenced by high-level category and motion. Decreasing categorical similarity and increasing motion congruence enhance surround suppression, impacting visual perception.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Surround suppression, a decrease in perceptual sensitivity due to surrounding context, is well-studied with simple visual stimuli.
  • Its application to complex, natural scenes with high-level features remains less understood.
  • Previous research primarily focused on low-level visual features, leaving the role of semantic and motion information unclear.

Purpose of the Study:

  • To investigate surround suppression in complex, dynamic natural scenes.
  • To examine how categorical similarity and motion congruence between central and surrounding scenes modulate this phenomenon.
  • To determine if high-level features influence contextual modulation in natural vision.

Main Methods:

  • Two experiments measured contrast sensitivity for central scenes during categorization tasks.
  • Categorical similarity was manipulated across four levels: identical, same basic-level, different basic-level, and different superordinate categories.
  • Motion congruence was manipulated by having central and surrounding scenes drift in the same or opposite directions.

Main Results:

  • Surround suppression increased as categorical similarity decreased, with the strongest effect observed for different superordinate categories.
  • This contrasts with simple stimuli, where increased similarity typically enhances suppression.
  • Suppression was stronger when central and surrounding scenes moved in the same direction, consistent with findings from simple stimuli.

Conclusions:

  • Contextual modulation in natural vision depends on both low-level features and high-level categorical structure.
  • Decreasing categorical similarity enhances surround suppression in complex scenes.
  • Context-dependent suppression aids in prioritizing relevant information and filtering incongruent visual input.