Or it could be argued that the brain comes to accept the spell-check as an extension of itself.
That's my theory on why people love their iphones so much. Some part of their brain has grown used to the easy access of information and communication, and decided that the iphone is merely an extension of itself..
Which is why some people are helpless without them.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather