When a person has a new experience, their brain faces a subtle but critical decision: should this experience be categorized with other stored memories, or should it be filed away as its own new memory ...

Researchers have found that cells in the rat hippocampus -- a brain region that is essential for making memories -- are specifically organized into small clusters when fear-based memories are formed.

Tsukuba, Japan—Although we know that groups of cells working together in a specific brain region—the hippocampus—are vital for making, storing, and retrieving many types of memories, we still don't ...