Famous faces activate contextual associations in the parahippocampal cortex

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• The parahippocampal cortex (PHC) is traditionally linked to place processing and episodic memory.
• A unified function for the PHC in contextual associative processing has been proposed, relevant to both navigation and memory.

Purpose of the Study:

• To investigate if the PHC mediates general contextual associative processing beyond spatial or episodic information.
• To test the hypothesis that associative stimuli, regardless of spatial content, activate the PHC.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Participants viewed images of famous faces (high association) and unfamiliar faces (low association).
• Brain activation patterns in the PHC were compared between the two face conditions.

Main Results:

• Contrasting famous faces with unfamiliar faces revealed significant activation in the PHC.
• This activation occurred despite faces being nonspatial stimuli and not typically associated with specific places.

Conclusions:

• The findings support the view that the PHC mediates general contextual associative processing.
• The PHC's role extends beyond spatial navigation and episodic memory to encompass broader associative functions.