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Researchers mapped face-part selectivity in the inferior occipital gyrus (IOG) using fMRI. They discovered a gradient of selectivity, correlating with retinotopy, suggesting functional organization in visual processing areas.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The ventral visual stream has categorical patches (e.g., faces, scenes).
  • Functional organization within these patches, like the inferior occipital gyrus (IOG), is not fully understood.
  • Understanding IOG organization is key to deciphering face perception.

Purpose of the Study:

  • To independently map spatial and face-part preferences in the human inferior occipital gyrus (IOG).
  • To investigate the relationship between retinotopy and face-part selectivity within IOG.
  • To characterize the range of neural selectivity for face parts in IOG.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) in healthy adults.
  • Vertex-wise tuning models to analyze retinotopic and face-part preferences.
  • Gaussian population tuning curves to model responses.

Main Results:

  • A common gradient of spatial and face-part selectivity was found across IOG, increasing from posterior to anterior.
  • Tuning curve width increased significantly from posterior to anterior IOG.
  • Upper visual field preferences correlated with increased representation of the upper face, mirroring perceptual biases.

Conclusions:

  • The inferior occipital gyrus (IOG) exhibits a broad range of neural face-part selectivity, from narrow to holistic.
  • IOG is functionally organized along a posterior-to-anterior gradient of selectivity, correlated with retinotopy.
  • This gradient suggests ventral visual areas may follow retinotopic "protomaps" for functional organization.