Let's say there is a handwriting analysis, like trying to understand how someone's brain guides their hand to write letters and numbers. This phrase talks about finding that the "mental guide" a person uses to write is different from what's expected or from another person's.

It's like discovering that the mental instructions or the picture in their mind that shapes their writing has its own unique twists and turns, making their handwriting stand out or differ, which is a big deal in figuring out if the handwriting belongs to the person in question or not.