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Jesse Gomez1, Vaidehi Natu2, Brianna Jeska2

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Human visual cortex receptive fields (RFs) mature early in basic visual areas but refine later in specialized regions. This development, particularly in face and word processing areas, is linked to viewing behavior and attention shifts.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Visual Neuroscience

Background:

  • Receptive fields (RFs) are fundamental to visual processing, defining neuronal responses to specific visual field locations.
  • The developmental trajectory of RFs in the human visual system remains largely uncharacterized.
  • Understanding RF development is crucial for comprehending visual perception maturation.

Purpose of the Study:

  • To investigate the developmental timeline of population receptive fields (pRFs) across the human ventral visual stream.
  • To determine how pRF properties change from childhood to adulthood.
  • To explore the relationship between pRF development and visual behavior.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Population receptive field (pRF) modeling was used to characterize RF properties.
  • Eye-tracking was utilized to monitor fixation patterns during visual tasks.

Main Results:

  • pRF properties in early visual areas (V1 to VO1) are adult-like by age 5.
  • pRFs in face- and character-selective regions continue to develop into adulthood.
  • Development in these specialized regions involves an increased foveal coverage bias for faces (right hemisphere) and words (left hemisphere).

Conclusions:

  • Visual cortex development is region-specific, with early maturation in basic visual areas and prolonged refinement in higher-level processing regions.
  • Changes in pRFs are associated with developmental shifts in visual attention and fixation behavior.
  • Competition for foveal representation may drive the differential development of RFs in face and word processing areas.