The em dash (—) is a form of punctuation which can function like a comma, a colon, or parenthesis. Like commas and parentheses, em dashes can set off extra information, such as examples, explanatory or descriptive phrases, or supplemental facts. When used like a colon, an em dash introduces a clause that explains or expands upon something that has preceded it. The use of em dashes has grown among academics, and AI machines have picked up on this and has been trying to do likewise, but excessive and incorrect usage of this punctuation has proved to be a useful detector of when someone has used a tool such as ChatGPT to write something on their behalf. Lester Kiewit speaks to behavioural linguist and BreadCrumbs founder, Leigh Crymble, about this apparent shortcoming of AI software.

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