Organization of high-level visual cortex in human infants.

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Science

Background:

• The human brain exhibits complex functional organization, particularly in the extrastriate visual cortex, with specialized regions for processing categories like faces and scenes in adults.
• Understanding the interplay between innate structures and experiential learning in brain development is a fundamental question in neuroscience.

Purpose of the Study:

• To investigate the developmental trajectory of functional organization in the human visual cortex during early infancy.
• To determine the extent to which category-specific visual processing is pre-specified at birth versus shaped by experience.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to scan awake 4-6-month-old infants while they viewed various visual stimuli categories.
• Development of novel fMRI scanning techniques suitable for awake infants was crucial for data acquisition.

Main Results:

• Infants aged 4-6 months demonstrated category-preferential regions in their visual cortex, spatially organized similarly to adults, responding to faces and scenes.
• Significant differences were observed in the precise response profiles and activity patterns across visual categories between infants and adults.

Conclusions:

• The large-scale organization of category preferences in the visual cortex is largely established within the first few months of life.
• Postnatal experience plays a critical role in refining the detailed response characteristics and activity patterns within these visual processing regions.