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Anterograde amnesia is the inability to form new long-term memories following an event like brain trauma, while memories from before the injury remain intact. This condition, often linked to hippocampal damage, disrupts the consolidation of information from short-term to long-term memory. A key characteristic of this amnesia is the differential impact on memory systems: individuals are typically unable to form new episodic (events) or semantic (facts) memories, but they often retain the ability to form new procedural memories (skills).

Anterograde Amnesia

A significant characteristic of anterograde amnesia is that while the ability to form new declarative memories (for facts and events) is lost, the capacity to form new procedural memories (for skills) often remains intact. This means a person with this condition could learn a new skill, like solving a puzzle, and improve with practice, yet have no conscious memory of ever having performed the task before.

Preservation of Procedural Memory in Anterograde Amnesia

Read the following scenario and analyze the individual's memory abilities. Based on the evidence provided, what specific pattern of memory impairment is being demonstrated? Explain which types of new memories the individual can and cannot form, using specific examples from the text to support your reasoning.

Analysis of Memory Impairment

Henry Molaison (H.M.) is one of psychology's most famous case studies. In 1953, surgeons removed large sections of his hippocampus to treat severe epilepsy. While the surgery successfully stopped his seizures without affecting his IQ or personality, it left him with anterograde amnesia. His short-term memory remained intact, but he permanently lost the ability to transfer new information into long-term memory—a process known as consolidation. This case was crucial for memory research because it demonstrated a clear dissociation between short-term and long-term memory and highlighted the temporal lobes' essential role in memory consolidation.

Case of Henry Molaison (H.M.)

An individual suffers a brain injury. Post-injury, they can clearly remember their life from before the accident but cannot recall what they ate for breakfast this morning. They are being taught to solve a complex puzzle. Each day, their speed and efficiency at solving the puzzle improve, yet they have no conscious recollection of ever having seen the puzzle before. Based on this information, which statement provides the most accurate analysis of their memory function?

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