Cortical idiosyncrasies predict the perception of object size

Area of Science:

• Neuroscience
• Visual Perception
• Computational Neuroscience

Background:

• Perception of visual object size is subjective and varies significantly between individuals and across the visual field.
• The precise neural mechanisms underlying visual size judgment remain incompletely understood.

Purpose of the Study:

• To investigate the relationship between individual differences in size perception and the functional architecture of the primary visual cortex (V1).
• To test the hypothesis that object size is inferred from neuronal population activity in V1.

Main Methods:

• Utilized novel behavioral methods to assess size perception biases in healthy volunteers.
• Employed functional magnetic resonance imaging (fMRI) to measure neuronal population activity and spatial tuning in V1.
• Developed a population read-out model linking V1 representations to perceptual size judgments.

Main Results:

• Demonstrated a correlation between individual biases in size perception and the spatial tuning of neuronal populations in V1.
• The population read-out model successfully linked the spatial distribution of V1 representations to subjective visual size perception.

Conclusions:

• Idiosyncrasies in the functional architecture of the visual cortex, specifically V1, significantly contribute to individual differences in size perception.
• The findings suggest that subjective visual experiences are shaped by the unique organization of the visual cortex.