It might involve similar regions, such as the Fusiform Face Area (FFA), but people with prosopagnosia don't necessarily have difficulty with identifying facial

It might involve similar regions, such as the Fusiform Face Area (FFA), but people with prosopagnosia don't necessarily have difficulty with identifying facial emotions; what they have difficulty with is in distinguishing and remembering faces from each other. It's a bit like the way most of us couldn't tell one sheep from another in a flock. Prosopagnosics tend to rely on things like voice, gait, haircuts, facial hair, and name badges.