https://www.technologyreview.com/2023/05/02/1072528/geoffrey...
A hallucination is a problem with input. Confabulation is false output.
Confabulation is when a person mistakenly recalls details and tries to "fill in the blanks", without realizing what they are saying is untrue.
https://www.technologyreview.com/2023/05/02/1072528/geoffrey...