Final answer:
Karen's difficulty with remembering new information after a head trauma would be classified as anterograde amnesia, which is the inability to transfer and consolidate new memories.
Step-by-step explanation:
Karen's amnesia, after a hiking accident that resulted in head trauma and difficulty remembering new information, would be categorized as anterograde amnesia.
Anterograde amnesia is commonly caused by brain trauma that affects the hippocampus, impairing the ability to transfer new information from short-term to long-term memory and consolidate memories. Unlike those with retrograde amnesia, individuals with anterograde amnesia can remember information and events that occurred prior to their injury but struggle to form new episodic or semantic memories, similar to the well-documented case of patient H.M.