Four decades ago, an MIT neuroscientist named Jerry Lettvin had a sudden inspiration about how our brains make sense of the world. What if each of us had a special set of neurons in our head whose only job was to recognize a particular person, place, or thing? It was a strange idea, but given what Lettvin knew about the brain, it was plausible. To describe his idea to his students, he made up a story [pdf].
The story was about Alexander Portnoy, the protagonist of Philip Roth’s novel Portnoy’s Complaint, which had just been published. The novel is a long monologue delivered by Portnoy as he lies on the couch of his psychoanalyst. In Lettvin’s version, Portnoy instead decided to go to a neurosurgeon named Akakhi Akakhievitch. Dr. Akakhievitch had discovered 18,000 neurons in the human brain that respond uniquely to a person’s mother. Since much of Portnoy’s misery ...
