Lot's of people don't write all that well. A little disorganized, awkward phrasing, run on sentences. If AI does a better job than even 10% of the population then of course there's going to be a sizeable amount of miscategorizing when asking humans to classify writing as computer or human generated.
You could probably use a corpus of purely human writing and have people attribute a decent portion to computer generated.
Asking why AI writing can fool humans is a bit like asking why a computer is better at many tasks often performed by humans.
You could probably use a corpus of purely human writing and have people attribute a decent portion to computer generated.
Asking why AI writing can fool humans is a bit like asking why a computer is better at many tasks often performed by humans.