Post-saccadic disruption of semantic category information in naturalistic scenes

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Neuroimaging

Background:

• Natural vision relies on saccades for efficient information sampling.
• Previous research indicates saccades impair basic visual processing, but effects on high-level attributes remain unclear.

Purpose of the Study:

• To investigate how saccades affect semantic category information processing in naturalistic scenes.
• To determine if post-saccadic visual processing limitations extend to high-level visual attributes.

Main Methods:

• Behavioral experiments measuring scene categorization accuracy at different post-saccadic delays.
• fMRI multivoxel pattern analysis (MVPA) to assess neural representations of scene categories in the PPA.

Main Results:

• Behaviorally, scene categorization accuracy significantly decreased for images presented within 50 ms after saccade completion.
• Neuroimaging revealed degraded scene category representations in the PPA for short (0-100 ms) compared to long (400-600 ms) post-saccadic delays.
• No reduction in overall PPA activation levels was observed.

Conclusions:

• Post-saccadic visual processing limitations extend to high-level semantic attributes of natural scenes.
• A distinct period of reduced visual information processing exists immediately following saccades, impacting complex scene understanding.