Positronic brain

Clockwork Cherubs had positronic brains. (PROSE: Lord Thymon and the Department of Problem-Solving)

Juliet the 945th recovered “positronic components” from her Fog Ship to create Juliet the 1273rd. (PROSE: Acquaintanceship-982 and the Missing Mail Mystery) Indeed, Pessimist's Fog Ship, the result of an ultimately-cancelled program to create individualised, intelligent Fog Ships, had a full-on positronic brain, which was linked to his pilot's, allowing him to always know the other's location in the Multiverse. (PROSE: Pessimist and the Dromedaries)

Studying Pessimist-242's strangely downcast disposition, “amateur researchers at the Department of Cupid Anatomy” once hypothesised that he had a negatronic brain instead of a positronic brain. The Department of Physics found this coinage “ridiculous and entirely unscientific”. (PROSE: Acquaintanceship-982 and the Missing Mail Mystery) Indeed, Pessimist himself once figuratively claimed to have “a positronic brain the size of the Homeworld”. (PROSE: Pessimist and the Dromedaries)

Pythagoras-858 once explained to Lord Thymon that “our essence runs on more than just gemstones and positrons” when trying to make him understand how important the Cupid Homeworld itself was to the Crew. (PROSE: Magic Trick)

Behind the scenes

The positronic brain was a critical robot component in Issac Asimov's golden age science fiction tales. Being the first writer to meaningfully address robots as both characters and plausible technological items, his robot stories were highly influential on later science fiction.