Answer:
This is an illustration of post-identification feedback effect.
Explanation:
Post-identification feedback effect, as the name suggests, concerns the effect the feedback given to a witness can have on that witness's recollection of people and events. That is, if told that their identification was correct or inaccurate, witnesses may end up distorting their initial identification to conform to the feedback. Notice that Alexis was not sure of her identification of the perpetrator at first. However, she became almost 100% sure once she was told someone else had identified the same man.