The use of artificial intelligence to score statewide standardized tests resulted in errors that affected hundreds of exams, the NBC10 Investigators have learned.

The issue with the Massachusetts Comprehensive Assessment System (MCAS) surfaced over the summer, when preliminary results for the exams were distributed to districts.

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The state's testing contractor, Cognia, found roughly 1,400 essays did not receive the correct scores, according to a spokesperson with the Department of Elementary and Secondary Education.

DESE told NBC10 Boston all the essays were rescored, affected districts received notification, and all their data was corrected in August.

So how did humans detect the problem?

We found one example in

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