What is the most likely source of the own-race bias?

Name: What is the most likely source of the own-race bias?
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Question

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The most likely source of the own-race bias is that familiar stimuli are easier to recognize than unfamiliar stimuli. This means that individuals are more likely to accurately recognize and remember the faces of people from their own race or ethnic group because they have more exposure to them and have had more opportunities to become familiar with their facial features.

What Is the Most Likely Source of the Own-Race Bias