Skip to Main Content
Biological & Biomedical Sciences
Yale Home

INFORMATION FOR

    Non-Uniform Visual Cortex Interactions Limit Spatial Vision

    Publication Title: Non-uniform contextual interactions in the visual cortex place fundamental limits on spatial vision

    Summary

    Question
    This study examined how the spatial arrangement of surrounding stimuli, referred to as flankers, influences visual processing in the primary visual cortex (V1). The researchers aimed to determine whether these contextual interactions are uniform across space or exhibit non-uniformities that mirror perceptual phenomena such as visual crowding.
    Why it Matters
    Visual crowding is a phenomenon where nearby visual stimuli interfere with the perception of a target, significantly limiting spatial vision and object recognition. Understanding the neural basis of crowding and spatial non-uniformities in V1 can shed light on fundamental constraints in visual processing. This knowledge has implications for fields such as vision science, neuroscience, and clinical applications for visual impairments.
    Methods
    The researchers conducted extracellular recordings in the V1 of two macaque monkeys during a passive fixation task. Visual stimuli, including target and flanker arrangements, were presented at specific orientations and spatial locations relative to each neuron’s receptive field. Neural responses were analyzed across cortical layers to examine how spatial context affects visual processing.
    Key Findings
    The study found that flanker location impacts V1 responses in a non-uniform manner. Radial-out flankers (positioned further from the center of gaze than the target) most strongly disrupted neural decoding of the target’s orientation, broadening orientation tuning curves through tuned suppression and untuned facilitation. These effects were most pronounced in excitatory neurons in the input and superficial layers of V1, which are key components of the feedforward visual pathway. The results mirror perceptual crowding patterns observed in behavioral studies.
    Implications
    These findings reveal that spatial non-uniformities in visual processing originate in V1, challenging the assumption of uniform contextual integration. This has implications for understanding how the brain processes complex visual scenes and the neural mechanisms underlying crowding. The research also highlights the importance of considering spatial and layer-specific interactions in models of cortical processing.
    Next Steps
    The authors suggest further investigation into whether the observed non-uniformities originate from subcortical regions or higher visual areas. Future studies could explore how these spatial interactions are influenced by other factors, such as attention or visual experience, and their role in shaping visual perception.
    Funding Information
    This research was supported by the National Institutes of Health (awards R01 EY032555, T32-NS007224, and T32-NS041228). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Additional funding was provided by the NARSAD Young Investigator grant, the Ziegler Foundation grant, and Yale Orthwein Scholar funds.

    Full Citation

    Morton M, Denagamage S, Hudson N, Nandy A. Non-uniform contextual interactions in the visual cortex place fundamental limits on spatial vision. Cell Reports 2025, 44: 116571. PMID: 41241946, PMCID: PMC12740235, DOI: 10.1016/j.celrep.2025.116571.
    This AI-assisted summary has been reviewed and approved by at least one of the study's authors to ensure it accurately reflects the research.

    Authors

    • Mitchell P. Morton

      First Author
      Other Institution

    • Anirvan Nandy, PhD

      Last Author
      Yale School of Medicine

      Associate Professor Neuroscience

      View Full Profile

    Other Authors

    • Sachira Denagamage;
    • Nyomi V. Hudson

    Research Themes

    Keywords

    Concepts

    Get Involved With This Research

    Media Contact

    For media inquiries, please contact us.
    ysmmedia@yale.edu
    Support