Cortical areas involved in object, background, and object-background processing revealed with functional magnetic...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Object and place processing are thought to be distinct in the ventral visual stream.
• The hippocampus and parahippocampal gyrus are implicated in integrating objects with scenes, but typically require directed attention.

Purpose of the Study:

• To investigate the neural dissociation of object, background scene, and contextual integration during passive viewing.
• To determine if the brain can bind objects and scenes without directed encoding or retrieval.

Main Methods:

• Functional magnetic resonance adaptation (fMRI-A) was employed.
• Participants passively viewed naturalistic images with object-scene pairings.
• Selective repetition of objects, scenes, or object-scene pairs was used to probe neural adaptation.

Main Results:

• Bilateral fusiform areas adapted to object repetition, irrespective of scene novelty, indicating object-specific processing.
• Bilateral parahippocampal regions adapted to background scene repetition, irrespective of object novelty, indicating scene-specific processing.
• Distinct bilateral parahippocampal regions and the right hippocampus adapted only to repeated object-scene pairings, suggesting binding operations.

Conclusions:

• Neural substrates for object and scene processing are dissociable during passive viewing.
• The hippocampus and parahippocampal cortex are involved in binding object-scene information, particularly when the specific pairing is repeated.
• These findings extend our understanding of scene perception and memory formation.