Which condition results in the inability to form new long-term memories?

Anterograde amnesia is characterized by the inability to form new long-term memories after the event that caused the amnesia. This means that while a person may recall events that occurred prior to the onset of the condition, they struggle with creating new memories as time progresses. This condition often results from damage to the hippocampus or surrounding areas in the brain that are crucial for the process of memory consolidation.

In contrast, retrograde amnesia is focused on the inability to retrieve memories that were formed before the onset of amnesia, impacting past memories rather than affecting the formation of new ones. Global aphasia primarily affects the ability to communicate, impeding both speech production and comprehension without directly impacting memory formation. Visual agnosia relates to the inability to recognize objects despite having intact vision, which does not involve memory formation in the way anterograde amnesia does. Thus, anterograde amnesia is the appropriate answer as it directly pertains to the inability to create new long-term memories.