Explain why a false memory being held with full subjective conviction, rather than with any hint of doubt, makes it clinically and forensically significant.

If a false memory were held tentatively or with visible doubt, it would be relatively easy to identify and would carry limited real-world consequence. What makes it significant is precisely that the person is not lying and experiences it with the same subjective conviction as a genuine memory — from the inside, there is no felt difference between a true and a false memory, and often no way for the person themselves to tell them apart. This is what allows false memories to withstand direct challenge, to be repeated consistently and sincerely, and, in the most serious cases, to underlie false confessions to offences the person did not commit — the very confidence that would normally make a memory seem reliable is, in this specific phenomenon, no guide to its accuracy at all.