Shared memories reveal shared structure in neural activity across individuals

Area of Science:

• Neuroscience
• Cognitive Psychology
• Memory Research

Background:

• Human lives are built on shared experiences and memories.
• Understanding how individuals' brains represent the same event is crucial for memory research.

Purpose of the Study:

• To investigate the similarity of neural representations for shared real-life events.
• To determine if brain activity patterns during memory recall are consistent across individuals.

Main Methods:

• Participants watched a movie and later described events during functional MRI (fMRI) scans.
• Researchers analyzed event-specific spatial patterns in brain activity during verbal recall.
• Compared neural patterns during perception versus recall between individuals.

Main Results:

• Event-specific neural patterns were reinstated in default-network, medial-temporal, and visual areas during recall.
• These patterns were discriminable between events but similar across individuals, indicating consistent spatial organization.
• Neural patterns during recall were more similar between people than perception-to-recall patterns, showing memory reshaping.

Conclusions:

• A common spatial organization for memories exists in high-level cortical areas, abstracted beyond sensory details.
• Neural patterns of perception are systematically reshaped into shared memory representations across individuals for real-life events.