Elfenbein and Ambady (2003) showed that a person's facial recognition of emotions in different national groups is more accurate if a person has had significant contact with those groups.
Both Elfenbein and Ambady found that Caucasians showed higher accuracy and shorter response times for recognizing emotional expression performed by Caucasians than by Asians.
That show that the more often you see people of different backgrounds then, the more accurately you recognize their faces during direct contacts and on photographs and videos.
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