After kieran was in a skateboarding accident, he could remember everything that had happened to him before the accident, but he could not form new memories. kieran most likely has amnesia.

Anterograde Amnesia

Explanation: "Anterograde amnesia is a loss of the ability to create new memories after the event that caused amnesia, leading to a partial or complete inability to recall the recent past, while long-term memories from before the event remain intact."

answer; conditional stimulus will trigger a conditioned response;

answer; personally distressful;