Taking a page from Matt Murdock, the latest hero of the Ace Attorney series is a lawyer who can listen to heartbeats to determine if they're telling the truth. That said, Kizuki Kokone is not yet an expert at doing so, says the game's official web page, in a post revealing her arrival in Ace Attorney 5.
Joining Apollo Justice in the pursuit of truth, Kokone's talent is manifest in the Heart Scope, a panel she checks as a witness gives his or her testimony. When using it, players will also hear noises mixed with the witness statements. Reducing that noise level, and interpreting whether and how the statements conflict with certain emotions, will be key to deducing whether someone's testimony is true or bunk.