Neural correlates of visual-motion perception as object- or self-motion.

Area of Science:

• Neuroscience
• Perception
• Visual Processing

Background:

• Visual motion stimuli can create ambiguity between object motion and self-motion perception (vection).
• Understanding the neural basis of vection is crucial for explaining how the brain resolves visual motion ambiguity.

Purpose of the Study:

• To investigate the neural correlates of self-motion perception (vection) using functional magnetic resonance imaging (fMRI).
• To identify brain regions involved in processing visual motion stimuli and perceptual rivalry.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to record brain activity in human observers.
• Participants were exposed to constant-velocity roll-motion visual stimuli to induce vection.

Main Results:

• Sustained activity was observed in higher-order parieto- and temporo-occipital areas responding to optical flow during vection.
• Early visual areas and vestibular cortex showed deactivation during vection.
• Transient activations in higher-order areas correlated with perceptual switches between object motion and vection.
• The cerebellar nodulus showed increased activity during perceived self-motion.

Conclusions:

• Higher-order visual areas are sensitive to visual motion stimuli and their perceptual bistability.
• The cerebellar nodulus may play a role in processing self-motion perception.
• Neural mechanisms for perceiving self-motion from vision alone were identified, highlighting vision's role when other senses fail.