Ryan,a high-school football player,received a head injury during a game.After he recovered,Ryan was unable to remember anything that happened before the injury.However,he was able to form new memories.In the context of forgetting,Ryan's condition best exemplifies

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Retrograde amnesia is characterized by the inability to recall past memories before an incident, which matches Ryan's condition of not remembering anything that happened before his head injury. Anterograde amnesia, in contrast, is the inability to form new memories after an incident. The primacy and recency effects relate to memory biases in list learning, not to types of amnesia.

Ryan,a High-School Football Player,received a Head Injury During a Game