SAT Question 94c9788e: Transitions answer and explanation

English - Transitions - Contrast Transition
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Brain imaging research led by neuroscientist Dwaynica Greaves found that actors showed suppressed responses in the left anterior prefrontal cortex (the portion of the brain associated with self-awareness) when their names were called during performances; ______ the actors’ responses were normal in nonacting contexts. These findings suggest that when embodying characters, performers may temporarily set aside their personal identities.
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Difficulty:Medium
Which choice completes the text with the most logical transition?