Explain why a flashback is described as bringing back the cognitive and emotional quality of the original event, and why this matters for how it is distinguished from an ordinary unwanted memory.

An ordinary intrusive recollection is still experienced, throughout, as a memory — something being recalled from the past, however unwelcome its arrival. A flashback goes further: for the duration of the episode, the person can feel and, to some degree, act as though the original event is actually happening again in the present, complete with the emotional and physical sensations that accompanied it the first time. This re-experiencing quality, rather than the mere unwelcomeness of the memory, is what makes a flashback a distinct clinical phenomenon rather than simply a more distressing version of an everyday intrusive thought, and is why specifically asking about this re-experienced quality, rather than just whether the memory is unwanted, is what actually establishes whether a flashback is present.