A person’s group identity is about safety snd security, as outgroup members are potentially dangerous, since NOT group members, This neurological bias develops naturally and early as part of survival.
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This study says the PRESENCE of an outgroup member during practice reduces normal processing of feedback, and hence depresses learning.
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Does this mean pros learn best among fellow pros? Does this mean pros don’t learn as well in the presence of a non-conformist with unusual dress?
Could be. I know Swedes react poorly to a teacher not wearing black skinny pants like everyone else!! LOL.
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The article describing this study conflates “presence” of outgroup person with “outgroup person giving feedback to the ingroup person”.

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