While RBF may include frowny neutral expressions, it also seems to include expressions that simply are neutral, just because there’s no hint of a smile. Expressions of concentration aren’t really neutral, and I think most people frown at least a bit. I go full-furrowed-brow, frown, evil eye when I’m concentrating, which goes beyond my relaxed, neutral expression (which already causes me to get described as “a terrorist” or “serial killer” in photo IDs).
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