According to Selman's model, at what point in development do children FIRST become able to mask their true feelings from others by behaving differently than how they feel?

Question

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Selman's model of social perspective-taking suggests that children first become able to mask their true feelings from others by behaving differently than how they feel during middle childhood, which typically ranges from ages 6 to 12. This ability reflects a growing understanding of the social world and others' perspectives.

According to Selman's Model, at What Point in Development Do