"Sucker Bait" by Isaac Asimov (Feb-March 1954 in Astounding).

The only nonscientist among the passengers of the Triple G. is 20-year-old Mark Annuncio of the "Mnemonic Service", who has been trained from the age of five to memorize and correlate vast amounts of information.

Here's a link to the second half of the story (serialized) which allows me to find summary of the first half of the story - which includes this:

Mark is under the care of his psychologist teacher, Oswald Sheffield, who protects him from the "noncompos" — short for “non compos mentis,” a term used by Mnemonics for all other humans — on the ship, who distrust the youngster as a nosy and annoying busybody.

"Sucker Bait" by Isaac Asimov (Feb-March 1954 in Astounding).

The only nonscientist among the passengers of the Triple G. is 20-year-old Mark Annuncio of the "Mnemonic Service", who has been trained from the age of five to memorize and correlate vast amounts of information.

Here's a link to the second half of the story (serialized) which allows me to find summary of the first half of the story - which includes this:

Mark is under the care of his psychologist teacher, Oswald Sheffield, who protects him from the "noncompos" — short for “non compos mentis,” a term used by Mnemonics for all other humans — on the ship, who distrust the youngster as a nosy and annoying busybody.