It happens often. We see someone who reminds us of someone else we know, or we have met but we cannot remember where, only the face is familiar.

Whether there was a single cell in the brain responsible for familiar face recognition was a longstanding question in neuroscience. Now, it seems that those cells, which researchers called “grandmother neurons”, are a reality.

New research in primates has pinpointed the existence of brain cells capable of relating visual information and memory in the brains of a couple of rhesus monkeys. How did they do that?

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